Bill and Bob conduct two separate studies. By an amazing coincidence, they obtain exactly the same sample means and standard deviations. However, Bill’s sample is twice as large as Bob’s. Which of these is true?
a. Bill’s critical values will be larger than Bob’s.
b. Bill’s degrees of freedom are smaller than Bob’s.
c. Bill is more likely to reject the null hypothesis than Bob.
d. Bill’s value of ? will be smaller than Bob’s.
c. Bill is more likely to reject the null hypothesis than Bob.
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. A researcher uses a within-subjects design in which one group completes a difficult puzzle and the second group completes an easy puzzle. He finds that participants who completed the difficult puzzle first were able to learn about the puzzle and completed the easy puzzle quicker, compared to participants who did the easy puzzle first. What type of threat to internal validity was described in this example?
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