a. State the hypotheses and identify the claim.

b. Find the critical values

c. Compute the test value.

d. Make the decision

e. Summarize the results.

1. At a certain university the mean income of parents of the entering class is reported to be $91,600. She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555. With a=0.05, is she correct?

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## This question was asked on Apr 19, 2010 and answered on Apr 19, 2010.

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