Question: The quality-control engineer for M&M-Mars tested whether or not the mean weight of fun-size Snickers was 20.1 grams. Suppose that the standard deviation of the weight of the candy was 0.75 gram before a machine recalibration. The quality-control engineer wants to know if the recalibration resulted in more consistent weights. A sample of 11 Snickers bars was collected which resulted in a sample standard deviation, s, or 0.6404. Conduct the appropriate test at the a = 0.05 level of significance.