Question: 2.8 Read Case Study 1.5 (p. 4) about prayer and blood pressure. a. What was the sample size for the observational study conducted by the

2.8 Read Case Study 1.5 (p. 4) about prayer and blood pressure.

a. What was the sample size for the observational study conducted by the National Institutes of Health?

b. Describe the observational units in this study.

c. Describe two variables that the researchers related to each other in Case Study 1.5.

d. Explain whether you think the researchers treated the observed data as sample data or as population data.

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