Supplement bridge: sampling and standard error

STA 112. Practice questions, not past papers.

Lessons

• Distinguish population, sample and design
• Allocation and uncertainty

Practice questions

1. A sampling distribution describes what?

   Statistics study edition practice item Q199; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

2. The standard error of a mean for independent observations with SD σ is what?

   Statistics study edition practice item Q200; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

3. Quota selection differs from stratified probability sampling mainly in what?

   Statistics study edition practice item Q201; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

4. Which sequence is necessary in a systematic probability sample?

   Statistics study edition practice item Q202; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

5. Independent observations have population SD 12. For a sample mean with n=36, find its standard error. Give the value to 4 decimal places.

   Statistics study edition practice item Q203; Source: S48, S54

6. Independent observations have population SD 20. For a sample mean with n=100, find its standard error. Give the value to 4 decimal places.

   Statistics study edition practice item Q204; Source: S48, S54

7. Independent observations have population SD 8. For a sample mean with n=16, find its standard error. Give the value to 4 decimal places.

   Statistics study edition practice item Q205; Source: S48, S54

8. The SD of a statistic over repeated samples is its standard _____.

   Statistics study edition practice item F065; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

9. Proportionate stratified allocation uses nh=nNh/_____.

   Statistics study edition practice item F066; Source: S46-48, S53-54, S61, S64; cross-reference STA 121 topics 32-35

Topic gap report