Mathematics, 05.05.2020 04:20 b2cutie456
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$131.00. Assume the population standard deviation is$18.80.
Construct a 90% confidence interval for the population mean.
The 90% confidence interval is (,0
(Round to two decimal places as needed.)
Construct a 95% confidence interval for the population mean.
The 95% confidence interval is(,)
(Round to two decimal places as needed.)
Interpret the results. Choose the correct answer below.
A.
With 90% confidence, it can be said that the population mean price lies in the first interval. With 95% confidence, it can be said that the population mean price lies in the second interval. The95% confidence interval is narrower than the 90%.
B.
With 90% confidence, it can be said that the population mean price lies in the first interval. With 95% confidence, it can be said that the population mean price lies in the second interval. The95% confidence interval is wider than the 90%.
C.
With 90% confidence, it can be said that the sample mean price lies in the first interval. With 95% confidence, it can be said that the sample mean price lies in the second interval. The 95% confidence interval is wider than the 90%
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