Error detection: full practice bank: open practice pack: learner worksheet

1. error-detection-q1

Compare these two invoice numbers. Are they identical? INV-2025-00847 vs INV-2025-00847

1. Identical
2. Different

Answer:

2. error-detection-q5

Compare these two dates as written: '03/07/2026' and '03/07/2026'. Are they identical?

1. Identical
2. Different

Answer:

3. error-detection-q2

Compare these two customer records. Are they identical? 'Jonathan A. Reyes, 14 Birchwood Ave' vs 'Jonathon A. Reyes, 14 Birchwood Ave'

1. Identical
2. Different

Answer:

4. error-detection-s01-q04

A supplier reference is copied from an order form onto a label. Order form: BX-7742-LM. Label: BX-7724-LM. How do the two differ?

1. Two digits have changed places
2. A digit has been dropped
3. A letter has been changed
4. They do not differ

Answer:

5. error-detection-s01-q05

Reference: 'Unit 9, Halstead Court'. Copy: 'Unit 9, Halsted Court'. What has changed?

1. The unit number
2. A letter has been dropped from the street name
3. An extra word has been added
4. Nothing has changed

Answer:

6. error-detection-s01-q06

Original: 'Order 5518: dispatched 14/03'. Duplicate: 'Order 5518: dispatched 14/08'. Where is the discrepancy?

1. In the order number
2. In the day of the month
3. In the month
4. There is no discrepancy

Answer:

7. error-detection-s01-q07

Which copy reproduces the reference string 'KTP-9034-BV' exactly?

1. KTP-9034-BU
2. KPT-9034-BV
3. KTP-9043-BV
4. KTP-9034-BV

Answer:

8. error-detection-s01-q08

Reference: '£1,450.00'. Copy: '£1,540.00'. What kind of error has occurred?

1. The decimal point has moved
2. Two digits have swapped places
3. An extra zero has been added
4. The currency symbol is wrong

Answer:

9. error-detection-s01-q09

A membership number is stored as 'M-00847' in one system and 'M-008470' in another. What is the difference?

1. One version carries an extra trailing digit
2. The prefix letter differs
3. Two digits have changed places
4. A hyphen is missing

Answer:

10. error-detection-s01-q10

Reference address line: 'Flat 2B, 118 Wentworth Road'. Copy: 'Flat 2B, 181 Wentworth Road'. Is the copy correct?

1. Yes, it matches
2. No: the flat number differs
3. No: the house number differs
4. No: the street name differs

Answer:

11. error-detection-q3

Which of these four account numbers does NOT match the reference number 5502-8871-034?

1. A) 5502-8871-034
2. B) 5502-8871-034
3. C) 5502-8871-043
4. D) 5502-8871-034

Answer:

12. error-detection-q6

Find the entry that breaks the pattern in this list of product codes: PC-100, PC-200, PC-300, PC-400, PD-500

1. PC-100
2. PC-300
3. PC-400
4. PD-500

Answer:

13. error-detection-s02-q03

A reference part number reads 'TL-3390-KD'. Which of the copies below reproduces it faithfully?

1. TL-3390-KO
2. TL-3390-KD
3. TL-3930-KD
4. TI-3390-KD

Answer:

14. error-detection-s02-q04

Four staff numbers were issued in one batch and should run consecutively from 4471: 4471, 4472, 4437, 4474. Which number is out of place?

1. 4471
2. 4472
3. 4437
4. 4474

Answer:

15. error-detection-s02-q05

Three of these email addresses are the same. Which one differs?

1. r.okafor@medlin.co.uk
2. r.okafor@medlin.co.uk
3. r.okafor@medlim.co.uk
4. r.okafor@medlin.co.uk

Answer:

16. error-detection-s02-q06

Every code in a valid batch begins with the prefix 'GB-'. Which entry breaks the rule?

1. GB-4471
2. G8-1174
3. GB-9902
4. GB-3350

Answer:

17. error-detection-s02-q07

A checklist requires every reference to be exactly eight characters long. Which reference fails that check?

1. AB123456
2. CD987654
3. EF135790
4. GH24680

Answer:

18. error-detection-s02-q08

Four dates were copied from a diary for a weekly meeting: 03/09, 11/09, 18/09, 25/09. Which entry is inconsistent with the rest?

1. 03/09
2. 11/09
3. 18/09
4. 25/09

Answer:

19. error-detection-s02-q09

In a stocktake every line should read 'Qty' followed by a whole number. Which line breaks the format?

1. Qty 3.5
2. Qty 14
3. Qty 6
4. Qty 20

Answer:

20. error-detection-s02-q10

Four lengths were recorded for the same component: 240 mm, 0.24 m, 24 cm, 2.4 mm. Which entry does not describe the same length as the others?

1. 240 mm
2. 0.24 m
3. 24 cm
4. 2.4 mm

Answer:

21. error-detection-q4

A shipment manifest lists 'Qty: 120, Weight: 45.6kg'. The warehouse receipt shows 'Qty: 120, Weight: 46.5kg'. What is the discrepancy?

1. Quantity differs
2. Weight differs
3. Both differ
4. No discrepancy

Answer:

22. error-detection-s03-q02

Booking form: 'Name: L. Ferreira | Date: 12 May | Party: 4 | Table: 9'. Confirmation email: 'Name: L. Ferreira | Date: 12 May | Party: 6 | Table: 9'. Which field disagrees?

1. The name
2. The date
3. The party size
4. The table number

Answer:

23. error-detection-s03-q03

Purchase order: 'Item: HDMI cable | Length: 3 m | Qty: 25 | Unit price: £4.20'. Supplier invoice: 'Item: HDMI cable | Length: 2 m | Qty: 25 | Unit price: £4.20'. What should be queried?

1. The cable length
2. The quantity
3. The unit price
4. Nothing: the records agree

Answer:

24. error-detection-s03-q04

Timesheet: 'Mon 7.5 | Tue 7.5 | Wed 8.0 | Thu 7.5 | Total 30.5'. Payroll record: 'Mon 7.5 | Tue 7.5 | Wed 8.0 | Thu 7.5 | Total 31.0'. Where is the fault?

1. Wednesday's hours
2. Thursday's hours
3. Monday's hours
4. The payroll total

Answer:

25. error-detection-s03-q05

Delivery note: 'Boxes: 12 | Pallets: 2 | Destination: Leeds'. Goods-in log: 'Boxes: 12 | Pallets: 3 | Destination: Leeds'. Which field needs investigating?

1. The box count
2. The pallet count
3. The destination
4. None: the records agree

Answer:

26. error-detection-s03-q06

Record A: 'Surname: Ahmadi | Given: Nadia | DOB: 04/11/1996'. Record B: 'Surname: Ahmadi | Given: Nadia | DOB: 11/04/1996'. What is the discrepancy?

1. The surname
2. The given name
3. The year of birth
4. The day and month have been reversed

Answer:

27. error-detection-s03-q07

Quotation: 'Subtotal £480.00 | VAT £96.00 | Total £576.00'. Invoice: 'Subtotal £480.00 | VAT £96.00 | Total £567.00'. Which line is wrong?

1. The subtotal
2. The VAT line
3. The invoice total
4. The quotation total

Answer:

28. error-detection-s03-q08

A contract summary reads: 'Start: 1 April 2026 | Term: 24 months | End: 31 March 2027'. The signed contract confirms both the start date and the 24-month term. Which entry in the summary is wrong?

1. The end date
2. The start date
3. The term
4. Nothing is wrong

Answer:

29. error-detection-s03-q09

The same mobile number appears as '+44 7700 900461' in one record and '+44 7700 900416' in another. Which part differs?

1. The country code
2. The last four digits
3. The middle block
4. Nothing differs

Answer:

30. error-detection-s03-q10

Stock record: 'Opening 120 | Received 45 | Issued 60 | Closing 115'. Which figure cannot be right if the other three are correct?

1. Opening
2. Received
3. Issued
4. Closing

Answer:

31. error-detection-s04-q01

Which word in this sentence is misspelled? 'The comittee agreed to publish the revised timetable on Friday.'

1. comittee
2. agreed
3. revised
4. timetable

Answer:

32. error-detection-s04-q02

Which spelling is correct?

1. occurence
2. occurrence
3. ocurrence
4. occurrance

Answer:

33. error-detection-s04-q03

One word is wrong for its meaning: 'The new rules will effect every department from Monday.' Which word is it?

1. rules
2. every
3. effect
4. department

Answer:

34. error-detection-s04-q04

Which of these words is misspelled?

1. seperate
2. definite
3. necessary
4. argument

Answer:

35. error-detection-s04-q05

Which word in this sentence is misspelled? 'The maintenence contract covers all four printers.'

1. contract
2. covers
3. maintenence
4. printers

Answer:

36. error-detection-s04-q06

Which sentence contains a word typed twice by mistake?

1. The engineer checked the pressure valve before the test.
2. The engineer checked the the pressure valve before the test.
3. The engineer checked the pressure valve after the test.
4. The engineer checked both pressure valves before the test.

Answer:

37. error-detection-s04-q07

Which word is wrong in this notice? 'All visitors must sign in at reception and where a badge at all times.'

1. where
2. visitors
3. reception
4. badge

Answer:

38. error-detection-s04-q08

Which spelling is correct?

1. accomodation
2. acommodation
3. accommodation
4. acomodation

Answer:

39. error-detection-s04-q09

Which word in this sentence is misspelled? 'The equipment was throughly tested before delivery.'

1. equipment
2. tested
3. delivery
4. throughly

Answer:

40. error-detection-s04-q10

Which sentence contains a misspelling?

1. The panel accepted the recommendation without amendment.
2. The panel published its findings in a supplementary report.
3. The panel adjourned until the following Tuesday.
4. The panel recieved the evidence in three separate bundles.

Answer:

41. error-detection-s05-q01

Which sentence uses the apostrophe correctly?

1. The companys' logo was redesigned last year.
2. The company's logo was redesigned last year.
3. The companys logo was redesigned last year.
4. The companies logo was redesigned last year.

Answer:

42. error-detection-s05-q02

Where is the error in this sentence? 'Each of the technicians have signed the safety register.'

1. The word 'Each' should be removed.
2. 'Technicians' should be singular.
3. 'Register' should be plural.
4. The verb should be 'has', not 'have'.

Answer:

43. error-detection-s05-q03

Which sentence contains a comma splice: two complete sentences joined by nothing more than a comma?

1. The meeting overran, so the vote was postponed.
2. The meeting overran, the vote was postponed.
3. The meeting overran and the vote was postponed.
4. Because the meeting overran, the vote was postponed.

Answer:

44. error-detection-s05-q04

A set of tools belongs to several engineers. Which sentence punctuates that correctly?

1. The engineers' tools were returned on Friday.
2. The engineer's tools were returned on Friday.
3. The engineers tools were returned on Friday.
4. The engineers's tools were returned on Friday.

Answer:

45. error-detection-s05-q05

Which sentence uses 'its' and 'it's' correctly?

1. Its been three weeks since the server lost it's backup.
2. It's been three weeks since the server lost it's backup.
3. It's been three weeks since the server lost its backup.
4. Its been three weeks since the server lost its backup.

Answer:

46. error-detection-s05-q06

Which sentence contains a dangling modifier: an opening phrase attached to the wrong subject?

1. Having reviewed the figures, the auditor signed the report.
2. After the figures were reviewed, the report was signed.
3. The auditor signed the report after reviewing the figures.
4. Having reviewed the figures, the report was signed by the auditor.

Answer:

47. error-detection-s05-q07

Where does this sentence go wrong? 'The report was clear, however it arrived too late to be considered.'

1. There is no error.
2. 'However' needs a semicolon or full stop before it, not a comma.
3. 'Considered' should read 'consider'.
4. The comma after 'clear' should simply be deleted.

Answer:

48. error-detection-s05-q08

Which sentence keeps its tenses consistent?

1. She opened the file and finds the figures missing.
2. She opens the file and found the figures missing.
3. She had opened the file and finds the figures missing.
4. She opened the file and found the figures missing.

Answer:

49. error-detection-s05-q09

Which sentence uses the semicolon correctly?

1. The trial ran for six weeks; the results were published in June.
2. The trial ran for six weeks; and the results were published in June.
3. The trial ran for six weeks; because the results were due.
4. The trial ran; for six weeks before publication.

Answer:

50. error-detection-s05-q10

Where does this sentence go wrong? 'Neither the invoice nor the delivery notes was attached to the email.'

1. 'Neither' should read 'Either'.
2. 'Nor' should read 'or'.
3. The verb should agree with 'notes', giving 'were attached'.
4. There is no error.

Answer:

51. error-detection-s06-q01

A receipt lists three items at £4.50, £2.25 and £8.10, and gives the total as £14.85. Is the total right?

1. Yes. The total is correct.
2. No. It is 20p too high.
3. No. It is 50p too low.
4. No. It is £1 too high.

Answer:

52. error-detection-s06-q02

An invoice line shows 6 units at £12.50 each and a line total of £70.00. The order confirms both the quantity and the unit price. What is wrong?

1. Nothing. The line is correct.
2. The unit price should be £11.67.
3. The quantity should be 7.
4. The line total should be £75.00.

Answer:

53. error-detection-s06-q03

A column of figures reads 145, 260, 95 and 300, with a stated total of 810. What is true of the column?

1. The total is 10 too high.
2. The total is correct.
3. The total is 10 too low.
4. The total is 100 too high.

Answer:

54. error-detection-s06-q04

An invoice reads: 'Subtotal £240.00, discount 15%, amount due £216.00'. Has the discount been applied correctly?

1. Yes: £216.00 is right.
2. No. The amount due should be £204.00.
3. No. The amount due should be £210.00.
4. No. The discount should be £24.00.

Answer:

55. error-detection-s06-q05

A budget sheet shows staff £12,400, materials £3,850 and travel £1,275, with a grand total of £17,525. Where is the fault?

1. The materials figure is too low.
2. The travel figure is too high.
3. There is no fault. The total is correct.
4. The staff figure has an extra digit.

Answer:

56. error-detection-s06-q06

A stocktake records 3 boxes of 24, 5 boxes of 12 and 2 boxes of 30, and states the total as 180 items. What is the correct total?

1. 168
2. 174
3. 180
4. 192

Answer:

57. error-detection-s06-q07

A table states that 45 of 300 survey responses were negative, and gives that as 18%. What should it say?

1. 15%
2. 20%
3. 18% is correct
4. 13.5%

Answer:

58. error-detection-s06-q08

A running balance reads: opening 500, minus 120, plus 65, minus 90, closing 335. What is true of the closing figure?

1. It should be 345.
2. It should be 355.
3. It is correct.
4. It should be 365.

Answer:

59. error-detection-s06-q09

A note reads: '2.5 kg of powder at £6 per kg costs £12'. What should the cost be?

1. £13.50
2. £14.00
3. £15.00
4. £12.00 is correct

Answer:

60. error-detection-s06-q10

An expenses claim covers 4 nights at £89 and 320 miles at 45p per mile, and states the total as £500. What is wrong with it?

1. The total is £20 too high.
2. The total is £36 too low.
3. The mileage has been costed at the wrong rate.
4. Nothing. The claim adds up correctly.

Answer:

61. error-detection-s07-q01

A form requires dates in DD/MM/YYYY. Which entry cannot be a real date?

1. 29/02/2024
2. 31/04/2025
3. 01/12/2025
4. 28/02/2026

Answer:

62. error-detection-s07-q02

Every reference must follow the pattern: two capital letters, a hyphen, then four digits. Which entry fails?

1. QR-4471
2. ZK-0088
3. MT-441
4. PL-9002

Answer:

63. error-detection-s07-q03

Which of these is not a valid email address?

1. s.iqbal@nortonpress.co.uk
2. s.iqbal@nortonpress..co.uk
3. s-iqbal@nortonpress.co.uk
4. s.iqbal@norton-press.co.uk

Answer:

64. error-detection-s07-q04

A column records each department's share of a budget, so every value must fall between 0 and 100. Which entry is impossible?

1. 104.2
2. 0.0
3. 99.9
4. 12.5

Answer:

65. error-detection-s07-q05

A time field uses the 24-hour clock. Which entry is invalid?

1. 00:15
2. 23:59
3. 24:10
4. 13:05

Answer:

66. error-detection-s07-q06

A field must hold a whole number of items. Which entry should be rejected?

1. 0
2. seven
3. 12
4. 150

Answer:

67. error-detection-s07-q07

A file-naming rule requires the form 'report-YYYY-MM.pdf'. Which filename breaks the rule?

1. report-2026-03.pdf
2. report-2025-11.pdf
3. report-03-2026.pdf
4. report-2026-12.pdf

Answer:

68. error-detection-s07-q08

A UK postcode field expects an outward part, a space, then a digit followed by two letters. Which entry is malformed?

1. EH3 9DR
2. M1 1AE
3. BS8 2QP
4. LS114 BX

Answer:

69. error-detection-s07-q09

A required numeric field is left blank on a form, and the system stores it as 0. Why is that a problem?

1. Zero is not a valid number.
2. The field should have rejected all numbers.
3. Zero cannot be stored in a numeric field.
4. A missing answer and an answer of zero mean different things.

Answer:

70. error-detection-s07-q10

A spreadsheet shows the reference '00471' in one row and '471' in another, and both refer to the same record. What has most likely happened?

1. The leading zeros were stripped when the value was read as a number.
2. The record was entered twice by different people.
3. The reference number was reissued.
4. The column has been sorted incorrectly.

Answer:

71. error-detection-s08-q01

Invoice numbers are issued consecutively. A file contains 3301, 3302, 3304 and 3305. What does the gap indicate?

1. An invoice is missing from the file.
2. The invoices have been filed in the wrong order.
3. Two invoices share a number.
4. The numbering has restarted.

Answer:

72. error-detection-s08-q02

A list should be in alphabetical order: Ahmed, Beckett, Chowdhury, Dunn, Ellis, Cortez. Which name is out of place?

1. Beckett
2. Dunn
3. Cortez
4. Ellis

Answer:

73. error-detection-s08-q03

A numbered procedure reads: step 1, step 2, step 3, step 3, step 4. What is the fault?

1. A step is missing.
2. A step number is repeated.
3. The steps are in the wrong order.
4. The numbering starts too late.

Answer:

74. error-detection-s08-q04

A sequence should increase by 7 each time: 14, 21, 28, 34, 42. Which term breaks the rule?

1. 34
2. 21
3. 28
4. 42

Answer:

75. error-detection-s08-q05

The page numbers in a printed report run 12, 13, 14, 16, 17. What should be checked first?

1. Whether the report has been bound the wrong way round.
2. Whether the numbering font has changed.
3. Whether page 15 is missing from this copy.
4. Whether the report should have started at page 1.

Answer:

76. error-detection-s08-q06

A price list should run from lowest to highest but reads: £4.50, £14.50, £4.95, £4.99, £15.00. Which entry sits in the wrong place?

1. £4.50
2. £4.95
3. £4.99
4. £14.50

Answer:

77. error-detection-s08-q07

A schedule lists start times of 09:00, 09:45, 10:30, 11:00 and 12:00, and states that every session lasts 45 minutes with no breaks. Which start time is inconsistent?

1. 11:00
2. 09:45
3. 10:30
4. 12:00

Answer:

78. error-detection-s08-q08

A version history reads v1.0, v1.1, v1.2, v1.20, v1.3. What has gone wrong?

1. A version has been skipped.
2. Two versions carry the same number.
3. One entry has been placed as though 20 followed 2.
4. The history should begin at v0.1.

Answer:

79. error-detection-s08-q09

Every seventh entry in a register should be a review line. Review lines appear at rows 7, 14, 21, 27 and 35. Which one is misplaced?

1. Row 21
2. Row 27
3. Row 35
4. Row 14

Answer:

80. error-detection-s08-q10

Readings should be taken every 15 minutes. The record shows 10:00, 10:15, 10:30, 10:45, 11:00 and 11:30. What does the record show?

1. A reading was taken too early.
2. The readings are in the wrong order.
3. The interval was changed to 30 minutes throughout.
4. One scheduled reading is missing.

Answer:

81. error-detection-s09-q01

An order confirms 200 units at £3.10 each. The delivery note records 200 units received. The invoice charges £610. What should be queried?

1. The quantity on the delivery note.
2. The invoice value, which is £10 below the agreed price.
3. The unit price on the order.
4. Nothing: the documents agree.

Answer:

82. error-detection-s09-q02

A specification requires the report to be signed by two directors. The submitted report carries one director's signature and the company secretary's. Is the specification met?

1. Yes. Two signatures are present.
2. Yes. The company secretary may sign in a director's place.
3. It cannot be determined.
4. No, only one of the two signatures is from a director.

Answer:

83. error-detection-s09-q03

A job advert gives the closing date as 14 March. The application portal shows 4 March. The internal brief says 'two weeks from 28 February'. Which source is the odd one out?

1. The portal
2. The advert
3. The internal brief
4. None: all three agree

Answer:

84. error-detection-s09-q04

A contract sets payment at 30 days from the invoice date. An invoice dated 3 June is marked 'due 3 July'. A reminder claims the invoice was overdue on 1 July. What is wrong?

1. The invoice date
2. The due date, which should be 2 July
3. The reminder, since nothing was overdue on 1 July
4. The contract term

Answer:

85. error-detection-s09-q05

A user guide says a device runs for 12 hours on a full charge. The packaging says 'up to 12 hours'. The technical sheet gives 8 hours in continuous use. What is the safest reading?

1. The guide and the sheet contradict each other, so neither is reliable.
2. The 12-hour figure is a maximum and the 8-hour figure describes one specific condition.
3. The packaging must be wrong.
4. The device runs for 20 hours in total.

Answer:

86. error-detection-s09-q06

A minute records that 'the committee approved options A and C'. The action list that follows contains tasks for options A, B and C. Where is the inconsistency?

1. Option A appears in both documents.
2. The minute should have listed the tasks.
3. The action list is too short.
4. The action list contains work for an option that was not approved.

Answer:

87. error-detection-s09-q07

A staffing policy requires one supervisor for every eight staff on shift. A rota shows 26 staff and 3 supervisors. Does the rota comply?

1. No: 26 staff need at least four supervisors.
2. Yes: three supervisors meet the ratio.
3. No: 26 staff need at least five supervisors.
4. It cannot be determined from the rota.

Answer:

88. error-detection-s09-q08

A translated form asks for 'date of arrival' where the original asked for 'date of departure'. The dates are copied straight across. What is the risk?

1. The form will be rejected for using the wrong language.
2. Correct-looking dates will be recorded against the wrong event.
3. The dates will be stored in the wrong format.
4. There is no risk. Both fields hold a date.

Answer:

89. error-detection-s09-q09

A summary states that 'sales rose in every region'. The table behind it shows North +4%, South +2%, East 0% and West +6%. Is the summary supported?

1. Yes. The average across regions is positive.
2. Yes: most regions rose.
3. No. One region did not rise.
4. It cannot be judged from the table.

Answer:

90. error-detection-s09-q10

A risk register states that a control has been 'in place since January'. The audit log shows the control was first configured in March. Which conclusion is best supported?

1. The audit log must be wrong.
2. The control has never been in place.
3. Both records are correct as they stand.
4. The register overstates how long the control has been operating.

Answer:

91. error-detection-s10-q01

A report concludes: 'Sales rose after we changed the packaging, so the packaging caused the rise.' Where is the weakness?

1. The sales figures may have been recorded wrongly.
2. The packaging change was too small to matter.
3. Something else happening at the same time could explain the rise.
4. More packaging designs should have been tested.

Answer:

92. error-detection-s10-q02

A quality check tests only the units lying at the top of each crate. Why is the result unreliable?

1. The sample is too large to interpret.
2. Units at the top are always the faulty ones.
3. The test should have been repeated.
4. The units examined cannot stand for the whole crate.

Answer:

93. error-detection-s10-q03

A procedure reads: 'Step 1. Record the meter reading. Step 2. Reset the meter. Step 3. Confirm the reading has been saved.' Where is the flaw?

1. Confirmation comes after the reset, so an unsaved reading is already lost.
2. The meter should never be reset.
3. Steps 1 and 2 should be combined into one.
4. There is no flaw in the order.

Answer:

94. error-detection-s10-q04

An argument runs: 'Every accredited supplier passed the audit. Bramwell Ltd passed the audit, so Bramwell Ltd is accredited.' What is wrong with it?

1. Nothing. The conclusion follows.
2. The audit may have been carried out incorrectly.
3. Passing the audit does not require accreditation, so the conclusion does not follow.
4. Bramwell Ltd may have passed a different audit.

Answer:

95. error-detection-s10-q05

A spreadsheet formula averages a column of values but the range includes the total row. What effect does that have?

1. None. The total does not change the average.
2. The average is inflated, because the total is counted as another value.
3. The average becomes zero.
4. The average is exactly halved.

Answer:

96. error-detection-s10-q06

A survey of current website users finds 92% are satisfied, and the report concludes that 92% of customers are satisfied. What is the fault?

1. The sample size is not stated.
2. Satisfaction cannot be measured as a percentage.
3. The survey should have been anonymous.
4. Customers who stopped using the site could never have been surveyed.

Answer:

97. error-detection-s10-q07

A checklist is signed off by the same person who carried out the work. Why is that a control weakness?

1. The work will take longer to complete.
2. The checklist is likely to be left incomplete.
3. The same misunderstanding that caused an error will hide it at review.
4. Two signatures are required on every document by law.

Answer:

98. error-detection-s10-q08

A test passes on the developer's own machine and this is offered as proof that the release is safe. What has been overlooked?

1. The conditions on that machine may differ from those where the release will run.
2. Tests can never provide evidence about software.
3. The test should have been run a second time.
4. The release should not have been tested before approval.

Answer:

99. error-detection-s10-q09

A weekly report announces that 'complaints fell by 50% this week'. Last week there were 4 complaints; this week there were 2. Why might the headline mislead?

1. The percentage has been calculated wrongly.
2. A fall in complaints is never good news.
3. The comparison should have used a total rather than a percentage.
4. A percentage drawn from very small counts exaggerates ordinary variation.

Answer:

100. error-detection-s10-q10

A validation rule rejects any date later than today. A user enters a planned delivery date and the entry is refused. Where is the fault?

1. The user should have entered a past date.
2. The rule has been applied to a field where future dates are legitimate.
3. Delivery dates should not be validated at all.
4. The rule should reject past dates as well.

Answer: