Chapter 3 Question 1A-C. The cohort study is conducted to assess the association between clinical characteristics and the risk of stroke. The study involves n=1250 participants who are free of stroke at the study start (baseline) and every year thereafter for 5 years. Table 3-8 displays data on hypertension status measured at baseline and hypertension status measured 2 years later.
a. Compute the prevalence of hypertension at baseline?
b. compute the prevalence of hypertension at 2 years?
c. compute the cumulative incidence of hypertension over 2 years?
Chapter 4 Question 18A-D. A pilot study is run to investigate the feasibility of recruiting pregnant women into a study of risk factors for preterm delivery. Women are invited to participate at their first clinical visit for prenatal care. The following represent the gestational ages in weeks of women who consent to participate in the study? 11, 14, 21, 22, 9, 10, 13, 18
a. compute the sample mean gestational age?
b. Compute the sample standard deviation of gestational age?
c. Compute the median gestational age?
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