Question

A sample of 23 observations is selected from a normal population where the sample standard deviation is 4.95. The sample mean is 16.90.  

a. Determine the standard error of the mean. (Round the final answer to 2 decimal places.)

The standard error of the mean is _______ .

b. Determine the 90% confidence interval for the population mean. (Round the t-value to 3 decimal places. Round the final answers to 3 decimal places.)

The 90% confidence interval for the population mean is between ____ and _____ .

c. If you wanted a narrower interval, would you increase or decrease the confidence level?

(Decrease or Increase)

Answer 1