REMEMBER TO USE EXCEL OR AN ONLINE PROGRAM FOR CALCULATING VALUES!!! 1. A resear

Question

REMEMBER TO USE EXCEL OR AN ONLINE PROGRAM FOR CALCULATING VALUES!!! 1. A research study was conducted to examine the clinical efficacy of a new antidepressant. Depressed patients were randomly assigned to one of 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. After four weeks of treatment, the patients completed the Beck Depression Inventory. The higher the score, the more depressed the patient. The data are presented below. Compute the ANOVA test to determine if there is a difference in the mean depression scores. Use a significance level of 0.04. ( -0.04 ) Placebo Low Dose Moderate Doss 38 47 39 25 42 14 26 19 23 18

Explanation / Answer

As p-value is less than the significance level of 0.04, we reject the null hypothesis.

This means there are significant evidence to coclude that at least two of the means are different

Anova: Single Factor SUMMARY Groups Count Sum Average Variance Placebo 5 191 38.2 66.7 Low dose 5 103 20.6 69.3 Moderate dose 5 74 14.8 61.7 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 1484.933333 2 742.4666667 11.2665655 0.001760645 4.25985568 Within Groups 790.8 12 65.9 Total 2275.733333 14

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