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 is the sample mean plus the margin of error, which is 1.645 * (s/sqrt(n)) = 1.645 * (14/sqrt(50)) = 3.42. Therefore, the upper bound is 31 + 3.42 = 34.42, which is greater than 34.32.

A Random Sample of 50 Provides a Sample Mean of 31