A researcher hopes to demonstrate that her Interpersonal Psychotherapy (IPT) is more effective than Cognitive Behavior Therapy (CBT) in reducing Beck Depression Inventory (BDI) scores. She predicts that the IPT group will have lower scores than the CBT. She randomly assigns 25 depressed patients to each treatment and her results are summarized below. Use alpha = .05 for the following questions. СВТ IPT X = 26 X = 21 S1 = 4 S2 = 3 ni= 25 n2 = 25

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1. A researcher hopes to demonstrate that her Interpersonal Psychotherapy (IPT) is more effective than
Cognitive Behavior Therapy (CBT) in reducing Beck Depression Inventory (BDI) scores. She predicts
that the IPT group will have lower scores than the CBT. She randomly assigns 25 depressed patients to
each treatment and her results are summarized below. Use alpha = .05 for the following questions.
СВТ
IPT
X = 26
S1 = 4
ni = 25
X = 21
S2 = 3
n2 = 25
Transcribed Image Text:1. A researcher hopes to demonstrate that her Interpersonal Psychotherapy (IPT) is more effective than Cognitive Behavior Therapy (CBT) in reducing Beck Depression Inventory (BDI) scores. She predicts that the IPT group will have lower scores than the CBT. She randomly assigns 25 depressed patients to each treatment and her results are summarized below. Use alpha = .05 for the following questions. СВТ IPT X = 26 S1 = 4 ni = 25 X = 21 S2 = 3 n2 = 25
B. Use a t-test to analyze the difference between the 2 groups.
a. State the null and alternative hypotheses.
b. Make a decision about the null.
I
c. State your conclusion.
Transcribed Image Text:B. Use a t-test to analyze the difference between the 2 groups. a. State the null and alternative hypotheses. b. Make a decision about the null. I c. State your conclusion.
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