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  = 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
=

0.05 level; reject or fail to reject H0 at the
= 0.01 level?

e. What type of test is this: exact or approximate?