1.What is the upper Confidence Interval for a random sample of 91, mean of 66, standard deviation of 23.1, and confidence level of 0.85?

2.The claim is a mean is 98 and you want to prove it is less. Test the hypothesis using an alpha of 0.1.Your sample of 23 had a mean of 97.02 and standard deviation of 10.78.

Calculate theCriticalDecisionRule.

3.Calculate the 90thpercentile for the data below.

15, 53, 59, 77, 21, 14, 0, -6,5

4.The claim is a mean is 239 and you want to prove it is more.Test the hypothesis within a 5% level of significance.Your sample of 142 had a mean of 253.34 and standard deviation of 76.48.

Calculate the Test Statistic.