A pilot study is run to investigate the effect of a lifestyle intervention designed to increase medication adherence in patients with HIV. Medication adherence is measured as the percentage of prescribed pills that are taken over a one-week observation period. Ten patients with HIV agree to participate and their medication adherence before and after the intervention are shown below. Compute the following: a) differences in adherence before versus after the intervention for each participant, b) the mean difference in adherence before versus after the intervention, and c) the standard deviation of the difference in adherence before versus after intervention. After Intervention Before Intervention Participant ID 80% 75% 84% 2 82% 3 70% 66% 70% 4 74% 88% 90% 5 75% 66% 6 51% 60% 90% 93% 88% 90% 9 91% 10 95% 7 CO

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Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.