We suspect that the average fasting blood sugar level of Mexican Americans is 108. A random sample of 225 clinic patients (all Mexican American) yields a mean blood sugar level of 119 (S2 = 100). Test the hypothesis that µ. = 108.
a. What is the hypothesis set for a two-tailed test?
b. Find the estimated s.e.m.
c. Find the Z statistic.
d. What decision should we make, i.e., reject or fail to reject H0 at the CY = 0.05 level; reject or fail to reject H0 at the CY = 0.01 level?
e. What type of test is this: exact or approximate?