Answer the following. 1. Find tæ/2 for a 99% confidence interval of a sample with size 20. 2. Find tæ/2 for a 95% confidence interval of a sample with size 10. 3. Find the 99% confidence interval for a sample with n3D17, X=7.6, and s=2.3. 4. A sample composed of 20 male senior high school students were taken randomly from a normally distributed population. Their heights were taken, and it was found out that the mean is 65 inches with a standard deviation of 2.15 inches. With 99% confidence, find an interval estimate for the population mean. 5. A certain sample whose size is 10 is known to have a mean of 73.25 with a standard deviation of 2.5. Find ta/2 for a 95% confidence interval.

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