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Researchers wish to test the effectiveness of a drug designed to treat depression. Seven clinically ...

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Researchers wish to test the effectiveness of a drug designed to treat depression. Seven clinically ...

Researchers wish to test the effectiveness of a drug designed to treat depression. Seven clinically depressed patients are given a standardized depression test before taking the drug and are evaluated 4 weeks later using the same test. It is known that the scores from this particular test are not normally distributed. The scores are shown here.

Patient	1	2	3	4	5	6	7
Before	139	155	125	120	140	145	150
After	122	150	125	120	130	150	155

Use a sign test to conclude whether the drug can be associated with a median decrease in depression level. Choose the correctp-value and conclusion. (Useα= 0.05.)

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p= 0.5000; there appears to be no median decrease in depression.

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p= 0.8125; there appears to be no median decrease in depression.

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p= 0.1875; there appears to be no median decrease in depression.

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p= 0.1875; there appears to be a median decrease in depression.

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Introductory Statistics: A Problem-Solving Approach

Edition: 3^rd

Author: Kokoska

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This helped my grade so much Perfect

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