The monthly incomes for 12 randomly selected people each wit

The monthly incomes for 12 randomly selected people, each with a bachelor\'s degree in economics, are shown on the right. Assume the population is normally distributed. (a) Find the sample mean. x = 1 (Round to one decimal place as needed.) (b) Find the sample standard deviation. s = (Round to one decimal place as needed.) (c) Construct a 95% confidence interval for the population mean mu. A 95% confidence interval for the population mean is . (Round to one decimal place as needed.)

Solution

x-bar= 4263.2

s= 260.1

c) 95% confidence interval

(4097.9, 4428.5)