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Patients are randomly assigned to undergo psychotherapy or behavioral therapy. After 20 therapeutic sessions, each patient...

Patients are randomly assigned to undergo psychotherapy or behavioral therapy. After 20 therapeutic sessions, each patient takes a mental health questionnaire. What test would be used to see if there are differences in mental health at the end of therapy?
(a) z test
(b) t test for one sample
(c) t test for two independent samples
(d) t test for two related samples

A researcher wants to test the hypothesis that visualization improves short-term memory. She randomly selects a group of subjects and measures their performance on a short-term memory task after the group uses imagery and after not using imagery. What test would the researcher use to test her hypothesis?
(a) z test
(b) t test for one sample
(c) t test for two independent samples
(d) t test for two related samples

math   Statistics-And-Probability   
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Answer #1

1) (c) t test for two independent samples (since samples are independent)

2)

(d) t test for two related samples (since sample subject has been used in both groups)

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