A consumer advocacy group suspects that a local supermarkets 10-ounce packages of cheddar cheese actually weigh less

Question:

A consumer advocacy group suspects that a local supermarket’s 10-ounce packages of cheddar cheese actually weigh less than 10 ounces. The group took a random sample of 20 such packages and found that the mean weight for the sample was 9.955 ounces. The population follows a normal with the population standard deviation of .15 ounce.
a. Find the p-value for the test of hypothesis with the alternative hypothesis that the mean weight of all such packages is less than 10 ounces. Will you reject the null hypothesis at α = .01?
b. Test the hypothesis of part a using the critical-value approach and α = .01.
Distribution
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