Lesson 1c.06

1c.06 Use stratification and know when this is appropriate before sampling takes place Quiz: Pearson Edexcel Statistics, Unit 1

20 questions

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Lesson 1c.06, Use stratification and know when this is appropriate before sampling takes place: 20 multiple choice questions for the Pearson Edexcel GCSE Statistics (1ST0), Unit 1: The collection of data, written with Revision Ninja.

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The 20 questions

  1. What is the process of dividing a population into subgroups before sampling?

    • Randomisation
    • Systematisation
    • Clustering
    • Stratification

  2. Which category is commonly used as a stratum in sampling?

    • Random number
    • Sample size
    • Tally mark
    • Age group

  3. At what stage must stratification be applied in a survey?

    • After sampling
    • Before sampling
    • During analysis
    • After data entry

  4. A population is 60% women. In a sample of 200 with proportional stratification, how many women are sampled?

    • 60
    • 140
    • 100
    • 120

  5. What should proportional stratification sample sizes be based on?

    • Equal numbers
    • Population proportion
    • Sample median
    • Random selection

  6. How many categories can be used when stratifying a population?

    • Always three
    • One or more
    • Exactly one
    • Only two

  7. Which formula gives the number in a stratum from a percentage x and an amount?

    • (x ÷ 100) × amount
    • amount ÷ x only
    • x × 100 ÷ amount
    • x + amount

  8. What is the main benefit of stratification in sampling?

    • Reduces data cost
    • Removes bias fully
    • Speeds up analysis
    • Fair representation

  9. A school has 600 pupils: 360 girls and 240 boys. A stratified sample of 60 is needed. How many girls should be sampled?

    • 60
    • 36
    • 24
    • 360

  10. Using the same school of 600 pupils (360 girls, 240 boys) and a sample of 60, how many boys should be sampled?

    • 36
    • 240
    • 24
    • 40

  11. A population of 1,000 has 15% under 20, 60% aged 20 to 59 and 25% aged 60 or over. A sample of 200 is taken. How many are aged 60 or over?

    • 25
    • 150
    • 50
    • 100

  12. Which stratum is most suitable for investigating pupil travel to school?

    • Year group
    • Shoe size
    • Eye colour
    • Favourite subject

  13. A researcher stratifies by gender and by age group (under 30 and 30 or over). How many strata are there?

    • 4
    • 2
    • 5
    • 3

  14. A population is 40% in town A, 35% in town B and 25% in town C. A sample of 120 is taken. How many are from town B?

    • 42
    • 48
    • 35
    • 40

  15. Which stratum is most appropriate for a survey on adult library use?

    • Height category
    • Handedness
    • Age group
    • Hair colour

  16. A population of 2,000 has stratum A of 800 and stratum B of 1,200. A sample of 150 is required. What are the stratum sample sizes?

    • A: 80, B: 70
    • A: 40, B: 110
    • A: 75, B: 75
    • A: 60, B: 90

  17. A sample of 50 is drawn from 500 people split proportionally into two strata of 400 and 100. How many come from the smaller stratum?

    • 5
    • 50
    • 10
    • 20

  18. A stratified sample of 90 is drawn from a population of 900 with strata of 540 and 360. How many come from the 360 group?

    • 36
    • 45
    • 54
    • 60

  19. Why is stratifying by age inappropriate for studying natural eye colour?

    • Too expensive
    • Hard to measure
    • No logical link
    • Sample too large

  20. What misconception does the statement 'stratification means sampling everyone' show?

    • Sampling bias
    • Random error
    • Data corruption
    • Confusing with census

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