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1. You are given the sample mean and the sample standard deviation. use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?

A random sample of 32 gas grills has a mean price of $630.90 and a standard deviation of $56.70.

A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and standard deviation of 8.0 bushels per acre

2. Find the critical value Zc necessary to form a confidence interval at the given level of confidence. c = 0.80 c = 0.85 c =0.97 c = 0.75

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