Question 1
\(\style{font-family:Times New Roman;}{\overline x}\) is the:
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second average of theith sample.
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average value of the second sample.
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second population mean.
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second weighted sample average.
Question 2
A drug for treating depression patients is evaluated for effectiveness. Three treatment options exist: 20 mg, 10 mg, and placebo (20, 10, P). Twelve patients are randomly assigned to provide 4 patients for each level. The change in score from a common test designed to quantify depression was recorded for each patient. The ANOVA summary from the test appears below:
| Source | df | SS | MS | F | p |
| Factor | 2 | 228.17 | 114.08 | 34.81 | 0.000 |
| Error | 9 | 29.50 | 3.28 |
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| Total | 11 | 257.67 |
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Does it appear that the drug might be effective in changing depression level? Select the appropriate conclusion and reasoning.
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No, the drug does not appear to have an effect on depression level because the test statistic is so large.
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Yes, the drug (or perhaps the placebo) appears to have an effect on depression level because thep-value is essentially zero.
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No, the drug does not appear to have an effect on depression level because thep-value is essentially zero.
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The test is inconclusive and needs a multiple comparison of means procedure to be able to make any statement concerning the relationship between the drug/placebo and depression.
A new drug development timeline, with the four phases of drug approval
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Graph showing oral administration of a single-dose drug. The time of onset is 2 hours and the end of ...
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