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. From a random sample of 45 business days, the mean closing price of a certain stock was $116.70. Assume the population standard deviation is $11.02. The 90% confidence interval is ( , ).
Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.99, x =14.2, s=0.73, n=14
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