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A researcher wants to determine whether or not a given drug has any effect on the...

A researcher wants to determine whether or not a given drug has any effect on the scores of human subjects performing a task of psychomotor coordination. The 9 subjects in Group A (Experimental Group) received an oral administration of the drug prior to being tested. Ten subjects in Group B (Control Group) received a placebo at the same time. The results of the experiment are shown below:

Group A Group B
12 21
14 18
10 14
8 20
16 11
5 19
3 8
9 12
11 13
15

Does the drug have an effect on psychomotor ability? Test using a two-tailed test with alpha set to α = .05. Compute r2. Explain what an effect size measures. Is this a small, medium, or large effect?

Math   Statistics-And-Probability   
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