Question

Salaries of 34 college graduates who took a statistics course in college have a​ mean, x overbar​, of $ 68 comma 500. Assuming a standard​ deviation, sigma​, of ​$12 comma 046​, construct a 99​% confidence interval for estimating the population mean mu. Click here to view a t distribution table.LOADING... Click here to view page 1 of the standard normal distribution table.LOADING... Click here to view page 2 of the standard normal distribution table.LOADING... ​$ nothingless than muless than​$ nothing ​(Round to the nearest integer as​ needed.)

Answer 1

Since population standard deviation is known, Use z-distribution.

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.005))" to find the Z-value.