A graduate student selects a sample of 25 participants to test whether the average time students attend to some task is greater than 30 minutes.

A graduate student selects a sample of 25 participants to test whether the average time students attend to some task is greater than 30 minutes.




a. one-independent sample t-test
b. two-independent sample t-test
c. related samples t-test using the repeated measures design
d. related samples t-test using the matched-pairs design




Answer: A


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