A statistician claims that the standard deviation of the wei

A statistician claims that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 randomly chosen firemen had a standard deviation of their weights of 26.2 pounds. Assume the variable is normally distributed. At = 0.05, what is the critical value 2 for this test? A) 31.410 B) 30.144 C) 10.851 D) 10.117

Solution

Answer is D ; 10.117

Reason , this is one tailed left test so chisquare at 19 df with significance 0.95 is 10.117