Supermarkets throughout the United States sell an average of 460 quarts of milk/day. Over a sample of 36 days chosen at random, a supermarket sells an average of 470 quarts/day with a standard deviation of 20 quarts. At the 0.05 level of significance, does the store sell more milk than the national average?
a. State null hypothesis
b. State alternative hypothesis
c. Is this a one or two tail test? why?
d. Will you conduct a t-test or z-test? why?
e. What is (are) the critical value(s)?
f. What is the decision rule?
g. calculate the statistic
h. What is your decision regarding null hypothesis and why?
i. Interpretation of the results
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