Select a random sample of 15 individuals and test one or more of the hypotheses in Exercise 1 by using the t test. Use α = 0.05.

Data from in Exercise 1

From the Data Bank, select a random sample of at least 30 individuals, and test one or more of the following hypotheses by using the z test. Use α = 0.05.

a. For serum cholesterol, H₀ : µ = 220 milligram percent (mg%). Use σ = 5.
b. For systolic pressure, H₀ : µ = 120 millimeters of mercury (mm Hg). Use σ= 13.
c. For IQ, H₀ : µ = 100. Use σ= 15.
d. For sodium level, H₀ : µ = 140 milliequivalents per liter (mEq/l). Use σ= 6.