1d.05 Know and demonstrate understanding of techniques used to deal with problems that may... Quiz: Pearson Edexcel Statistics, Unit 1

The 20 questions

1. What defines a survey non-response?

   • Incorrect date format
   • Spelling mistake
   • Outlier numerical value
   • Complete lack of data

2. What describes an incomplete survey response?

   • Zero questions answered
   • Late questionnaire return
   • Some questions unanswered
   • Data entered incorrectly

3. Which of these is an example of an incorrect data format in a spreadsheet?

   • Text in date column
   • Decimal in height column
   • Integer in count column
   • Percentage in rate column

4. Which method replaces missing numerical data with a calculated central value?

   • Using the mean
   • Inserting a zero
   • Adding a maximum
   • Deleting the row

5. What is the standard action for handling incomplete questionnaire responses?

   • Note the gaps
   • Change format codes
   • Guess missing values
   • Discard entire form

6. What is the primary purpose of following up non-responders?

   • Increase printing costs
   • Shorten survey length
   • Reduce response bias
   • Alter target audience

7. Which is a practical method for reducing non-response in surveys?

   • Changing data types
   • Ignoring missing forms
   • Deleting blank rows
   • Sending reminders

8. What primary problem is caused by missing data in a sample?

   • Improved data accuracy
   • Reduced sample size
   • Standardised formats
   • Faster data processing

9. A dataset has 120 responses, and 12 have a blank 'age' field. What proportion of responses is missing age?

   • 10%
   • 12%
   • 1%
   • 20%

10. What issue arises when combining height data recorded in metres and centimetres?

    • Zero inflation
    • Data omission
    • Format inconsistency
    • Sample bias

11. A survey sends 300 questionnaires and gets 240 back, of which 30 are incomplete. How many usable responses are there?

    • 180
    • 240
    • 270
    • 210

12. How should text entries like 'twelve' in a numeric column be handled?

    • Convert to digits
    • Delete the row
    • Leave as text
    • Replace with zero

13. What statistical risk occurs if survey non-responders share a specific demographic?

    • Increased precision
    • Biased results
    • Larger sample size
    • Correct formatting

14. How should you process a questionnaire with only question three missing?

    • Discard entire form
    • Insert zero automatically
    • Record gap as missing
    • Guess the answer

15. Which feature helps prevent incorrect formats in digital surveys?

    • Blank input lines
    • Open text boxes
    • Drop-down lists
    • Long text prompts

16. A dataset of 500 has 50 non-responses and 20 incomplete responses. What proportion is usable?

    • 80%
    • 90%
    • 86%
    • 96%

17. Observed values are 4, 6 and 10. A missing value is replaced by the mean of these observed values. What is the replacement, to one decimal place?

    • 6.7
    • 7
    • 8
    • 6

18. What is the recommended first step when missing data are suspected to be non-random?

    • Investigate the cause
    • Ignore the gaps
    • Delete all records
    • Replace with zeros

19. What risk arises from using zero to represent missing values in datasets?

    • Misread as real zero
    • Spreadsheet crash
    • Column deletion
    • Automatic data cleaning

20. When does non-response introduce bias into survey results?

    • Non-responders differ systematically
    • Questions are neutral
    • Data is tabulated
    • Sample size is large

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