In 1980, women who were under 50 years old had a mean body weight of 145 pounds, with a standard deviation of 20 pounds. You are required to test whether the mean body weigh/t in the population then and now differ.

State both the null and the alternative hypotheses.

In 1970, adults who were 18 years or more had a mean systolic blood pressure (SBP) of 148 mm Hg., with a standard deviation of 15 mm Hg. What appropriate statistical test would you use to see whether the mean SBP then and now differ?