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 anellptical for 30 minutes while lsterning 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 Were depression symptoms (i.e., Beck Depression Inventory scores) more consistent before or after the treatment? How do you know? O The scores are more consistent after the treatment, the standard deviation is larger after. O The scores are more consistent before the treatment, the standard deviation is smaller before. The scores are more consistent after the treatment, the mean is smaller after. The scores are more consistent before the treatment, the mean is larger before

Explanation / Answer

The beck depression inventory score is more consistent before the treatment because of smaller variance

Answer:

B) the score are more consistent before the treatment , the standard deviation is smaller before.

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