A statistician claims that the standard deeviation of the we

A statistician claims that the standard deeviation of the weights of firemen is less than 25 pounds. A sample of 20 randomly chosen firemen had a standard deviation oof their weights of 26.2 pounds. Assume the variable is normally distributed, At alpha = 0.05, what is the critical value x² for this test?

Solution

It is 10.12

Excel function used is CHIINV(1-0.05,19)