1c.05 Know the key features of a simple random sample and demonstrate understanding of how... Quiz: Pearson Edexcel Statistics, Unit 1

The 20 questions

1. What is the defining characteristic of every simple random sample?

   • Stratified by age
   • Sequential ordering
   • Equal selection likelihood
   • Proportional representation

2. Which physical method can be used to select a simple random sample?

   • First available
   • Drawing names
   • Quota filling
   • Every tenth person

3. Which electronic tool is commonly used to generate random numbers for sampling?

   • Spreadsheet chart
   • Digital clock
   • Calculator function
   • Database query

4. What action should be taken if a random number is repeated when sampling?

   • Subtract one
   • Restart the process
   • Keep both values
   • Ignore the repeat

5. How should a random number outside the population range be handled?

   • Round it down
   • Divide by two
   • Add it anyway
   • Discard it

6. Which tool provides a sequence of numbers used in random sampling?

   • Tally chart
   • Frequency table
   • Table of digits
   • Bar chart

7. What violates the fundamental principle of simple random sampling?

   • Missing list members
   • Using calculators
   • Ignoring repeats
   • Shuffling cards

8. Which sampling technique is NOT an example of simple random sampling?

   • Opportunity sampling
   • Random number generation
   • Lottery sampling
   • Table of digits

9. A population of 40 is numbered 01 to 40. The random digits are 73, 12, 05, 40 and 22. Which members are chosen?

   • 05, 12, 40, 73
   • 12, 05, 40, 22
   • 12, 73, 05, 22
   • 73, 12, 05, 40

10. Members numbered 01 to 25 are selected using random digits 26, 09, 00 and 17. Which members are chosen?

    • 09, 00, 17
    • 26, 09, 17
    • 09, 17
    • 00, 26

11. How do you scale a 0 to 1 calculator random number for 500 members?

    • Multiply by 500
    • Add 500
    • Divide by 500
    • Subtract 500

12. Each of 200 students is given a number and 20 numbers are drawn from a hat. Which method is this?

    • Simple random sampling
    • Systematic sampling
    • Quota sampling
    • Opportunity sampling

13. A ten-sided die is used for an 8-member population. What should you do on rolling a 9?

    • Select member eight
    • Select member one
    • Roll again
    • Subtract one

14. Which card-based method correctly selects a simple random sample?

    • Select by suit
    • Pick top five
    • Shuffle and draw
    • Choose face cards

15. Using numbers 1 to 150 for a population of 100 requires handling what issue?

    • Class widths
    • Stratum sizes
    • Cumulative frequency
    • Out of range

16. A population uses codes 001 to 250. What must be done with code 350?

    • Discard it
    • Include it
    • Round down
    • Halve it

17. What is the probability that a specified member is selected in a simple random sample of 20 from a population of 200?

    • 1 in 20
    • 1 in 10
    • 1 in 180
    • 1 in 200

18. Why does taking the first 15 names from a list fail to be random?

    • High variation
    • Fixed interval
    • Unequal selection chance
    • Stratified strata

19. A population is numbered 00 to 99. Are random pairs 58 and 86 valid?

    • Only 86 is valid
    • Only 58 is valid
    • Both are valid
    • Neither is valid

20. When using codes 0001 to 1200, which four-digit numbers are discarded?

    • 0000 to 1199
    • 0001 to 1200
    • 1201 to 9999
    • 1000 to 9999

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