13. Suppose the average weight of a Reese's Pumpkin candy bar in 2007 was 0.8 ounces.

Consumer Reports is investigating to determine if the average weight has changed. Out

of a random sample of 32 Reese's Pumpkins chosen, the average weight was 0.74 with

standard deviation 0.2. At the 1% significance level, what conclusion can be reached?

a. Give the null hypothesis, He, and the alternative hypothesis, Ha, for this situation.

b. What is the value of the "test statistic" that can be used in deciding He or Ha?

c. What is the "p-value" associated with the test statistic?

d. Using a level of significance of 0.01, what is your decision about Ho? How do

you know?

e. What is your conclusion in words?

f. What kind of error, Type I or Type II, is possible with your decision in step 4?