Placebo |
Low Dose |
Moderate Dose |
38 |
22 |
14 |
47 |
19 |
26 |
39 |
8 |
11 |
25 |
23 |
18 |
42 |
31 |
5 |
(a) The independent variable is three groups: a placebo group, a group that received a low dose of the drug, and a group that received a moderate dose of the drug.
The dependent variable is the clinical efficacy of a new antidepressant.
(b) The accountable variation = 65.25%
The unaccountable variation = 100 - 65.25% = 34.75%
Total variation = 100%
(c) A cause and effect statement cannot be made since the groups are given a dose of medicine and analyzed solely on the medication effects.
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