True or False: A random sample of 50 provides a sample mean of 31 with a standard
deviation of S = 14.The upper bound of a 90% confidence interval estimate of the population
mean is 34.32.

Question

Quizplus · Accepted Answer

The upper bound of a 90% confidence interval estimate of the population mean is given by the sample mean plus the product of the critical value and the standard error of the mean. The critical value for a 90% confidence interval is 1.645, and the standard error of the mean is S/sqrt(n) = 14/sqrt(50) = 2. Therefore, the upper bound of the confidence interval is 31 + 1.645 * 2 = 34.32.

True or False: a Random Sample of 50 Provides a Sample