The Stewart Aviation Products Company has been successfully manufacturing aircraft al- timeters with errors normally distributed with a mean of 0 ft (achieved by calibration) and a standard deviation of 43.7 ft. After the installation of new production equipment, 30 altime- ters were randomly selected from the new line. This sample group had errors with a standard deviation of s = 54.7 ft. Use a 0.10 significance level to test the claim that the new altimeters have a standard deviation different from the old value of 43.7 ft