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Please answer both of the following What is the sample size needed to provide a margin...

Please answer both of the following

What is the sample size needed to provide a margin of error of 3 with a 90% confidence when the population standard deviation equals 10?

A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of 5 examinations is selected at random and scored. The scores are shown below.

Grade

78

70

76

81

95

At 99% confidence, determine an interval for the mean of the population.

Math   Statistics-And-Probability   
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