11. The inean age at first marnage for inarried men in a New England community was 280 in 1790. For a random sample of 40 married men in that community in 1990, the sample mcan and standard deviation of age at first marriage were 26.0 and s = 9.0.

a) State the hypotheses, and find the test statistic and P-value for testing whether the mean has changed Interpret.

b) Make a decision, using a = 05.

c) If the decision in

(b) is an error. what type of error is it, Type I or Type II? <28 Interpret. > 28. Interpret

d) Report the P-value for the altermauve H,

e) Report the P-value for the alternative H