SAME STUDY: A researcher wants to test the effectiveness of an experimental trea

Question

SAME STUDY: A researcher wants to test the effectiveness of an experimental treatment for depression which involves exercise and classical music. He randomly selects n 50 patients taking depression medication from several clinics and invites them to his lab where he assesses their levels of depression with the Beck Depression Inventory (rated 0-63, with higher scores indicating more severe levels of depression). He finds that their mean depression score is M-24.3 with a standard deviation of s = 14.47. He then has them come to the lab four times a week to exercise on an elliptical for 30 minutes while listening to Johann Sebastian Bach over the course of one month. After the month, the researcher re-assesses the patients with the Beck Depression Inventory and finds that their mean depression score is M-17.08 with a standard deviation of s = 20.02. The researcher conducts a repeated-measures t-test to see if results suggest there is a significant (a-05) decrease in depression symptoms (i.e., Beck Depression Inventory scores) after this exercise and Classical music treatment. What is the critical value (Step 2) for this study? 0-1.671 1.671 -1.684 O 1.684 +/-2.021 +/-2.000 O +-1.96 1.65

Explanation / Answer

here degree of freedom =n-1=49

for this is left tailed test ; at 0.05 level and 49 degree of freedom critical value =1.67

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