Sample size and precision planning

STA 121. Practice questions, not past papers.

Lessons

• Plan sample size for a mean
• Plan sample size for a proportion

Practice questions

1. Required sample sizes from precision formulas should be rounded how?

   Statistics study edition practice item Q294; Source: T128-133

2. With no prior proportion, which planning value is conservative?

   Statistics study edition practice item Q295; Source: T128-133

3. Under mean precision planning, halving the margin requires what approximate sample-size change?

   Statistics study edition practice item Q296; Source: T128-133

4. Which issue is not automatically repaired by increasing planned n?

   Statistics study edition practice item Q297; Source: T128-133

5. Plan a mean interval with z=1.96, known/planning SD=6.95 and margin E=1. Find the minimum integer n.

   Statistics study edition practice item Q298; Source: T129-131

6. Plan a mean interval with z=1.96, known/planning SD=10 and margin E=2. Find the minimum integer n.

   Statistics study edition practice item Q299; Source: T129-131

7. Plan a mean interval with z=1.96, known/planning SD=5 and margin E=1. Find the minimum integer n.

   Statistics study edition practice item Q300; Source: T129-131

8. Precision sample-size calculations are rounded _____.

   Statistics study edition practice item F098; Source: T128-133

9. The conservative unknown-proportion planning value is _____.

   Statistics study edition practice item F099; Source: T128-133

10. Using z=1.96, p*=0.5 and E=0.05, minimum planned n=_____.

    Statistics study edition practice item F100; Source: T128-133

Topic gap report