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10 March, 18:03

One hundred volunteers who suffer from severe depression are available for a study. fifty are selected at random and are given a new drug, which is thought to be particularly effective in treating severe depression. the other 50 are given an existing drug for treating severe depression. a psychiatrist evaluates the symptoms of all volunteers after four weeks in order to determine if there has been substantial improvement in the severity of the depression. reference: ref 3-10 the factor in this study is

a. the extent to which the depression was reduced.

b. the use of randomization and the fact that this was a comparative study.

c. which drug the volunteers receive.

d. the use of a psychiatrist to evaluate the severity of depression.

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  1. 10 March, 18:04
    0
    Choice C. The factor would be the manipulation of the independent variable of which drug treatment volunteers were receiving.
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