You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 60 home theater systems has a mean price of $140. Assume the population standard deviation is $15.40 Construct a 90% confidence interval for the population mean. The 90% confidence interval is (nothing,nothing).

c = 0.90. a = 9.9. and E = 2 Answer = 67

c = 0.95. a = 2.1, n = 36 Answer 0.686

see excel spreadsheet. This your answer

Pequals=0.2709 Pequals=0.0793 Pequals=0.0286 Pequals=0.0143 see excel spreadsheet. This your answer

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