1. The mean grade point average for one college is 2.45 with a population standard deviation of .69. An engineering professor believes that engineering majors have a higher grade point average that the college's mean. A sample of 32 engineering majors had a grade point average of 2.65. Test at the .01 level. State the hypotheses and identify the claim, find the critical value(s), compute the test value, and make the decision, summarize the results.

1. Last year, a grocery store had a mean of $1850 in daily sales with a sample standard deviation of $150. This month a new advertising approach was used. The store manager wants to know if the new advertising had any effect on the daily sales. If this month sales had a mean of $1720 for 28 days, did the new advertising affect the daily sales at the .05 level of significance? State the hypotheses and identify the claim, find the critical value(s), compute the test value, and make the decision, summarize the results.

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