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Date: 04/20/14

Class: HLT -362-0191 Applied Statistics

Exercise 16 Mean and Deviation 1. The null hypothesis is for the study is: “There is no difference in the levels of empowerment, self-care self-efficacy, and depression of patients with ESRD who attend an empowerment program versus those who do not.”

2. What was the average baseline depression score of the experimental group subjects? The average or mean baseline depression score of the experimental group was 14.00.

3. Compare the baseline and the posttest means of the self-care self-efficacy variable for the experimental group. Was this an expected finding? Provide a rationale for your answer. The experimental group’s mean self-care self-efficacy posttest score (mean = 96.00) was 6.44 points higher than its baseline mean score (mean = 89.56) because on average the experimental group subjects scored higher on the posttest than at baseline or the beginning of the study. This was an expected finding because it was hypothesized that after the completion of the empowerment program, the experimental group’s self-care self-efficacy skills would improve. This finding indicates that the empowerment intervention had a positive impact on the self-care self-efficacy of ESRD patients.

4. Which group showed more variability or greater dispersion in their depression posttest scores? Provide a rationale for your answer. The experimental group’s posttest scores were slightly more dispersed as demonstrated by the larger SD = 10.55, as opposed to the SD = 10.34 for the control group. But there is really minimal difference in the SD for both groups. Implying that the greater the standard deviation, the more dispersed the scores of the experiment are from the mean.

5. What was the arithmetic average of all empowerment posttest scores collected in this study? The arithmetic average

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