Question

A commercial farm uses a machine that packages carrots in twenty-two ounce portions. A sample of 74 packages of carrots has a standard deviation of 0.38. Construct the 98% confidence interval to estimate the standard deviation of the weights of the packages prepared by the machine. Round your answers to two decimal places.

Answer 1

We have given here,                      
                      
          
Sample standard deviation=0.38          
Sample size =74              
                      
Degree of freedom =n-1=   73          
Level of significance given =0.02          
Chi square critical value for lower tail=47.858      
                      
Chi square critical value for upper tail=104.01