A candy company fills a 20-ounce package of Halloween candy with individually wrapped pieces of candy. The number of pieces of candy per package...

A candy company fills a 20-ounce package of Halloween candy with individually wrapped pieces of candy. The number of pieces of candy per package varies because the package is sold by weight. Inspectors randomly sample 16 packages of this candy and count the number of pieces in each package. They find that the sample mean number of pieces is 15.6, with a sample standard deviation of .75. Construct a 95% confidence interval for the population variance.  please show your work