Supplement bridge: testing and paired

STA 112. Practice questions, not past papers.

Lessons

• Write hypotheses and select a tail
• Match test structure to the data

Practice questions

1. Which data structure calls for a paired t test?

   Statistics study edition practice item Q206; Source: S49-61; cross-reference STA 121 topics 36-39

2. For n independent paired differences, t-test degrees of freedom are what?

   Statistics study edition practice item Q207; Source: S49-61; cross-reference STA 121 topics 36-39

3. The direction of a test is determined by what?

   Statistics study edition practice item Q208; Source: S49-61; cross-reference STA 121 topics 36-39

4. What does failing to reject H0 imply?

   Statistics study edition practice item Q209; Source: S49-61; cross-reference STA 121 topics 36-39

5. Independent paired differences are 2,4,3,5,1. Find the t statistic for H0: mean difference=0. Give the value to 4 decimal places.

   Statistics study edition practice item Q210; Source: S55

6. A paired t test uses within-pair _____.

   Statistics study edition practice item F067; Source: S49-61; cross-reference STA 121 topics 36-39

7. A nondirectional alternative uses the symbol _____.

   Statistics study edition practice item F068; Source: S49-61; cross-reference STA 121 topics 36-39

Topic gap report