Hypothesis testing: z tests. Cereal is sold on the basis of weight not volume. A

Hypothesis testing: z tests. Cereal is sold on the basis of weight not volume. A test of products shipped from the manufacturer found a sample average product weight of 15.9 ounces per box with a sample standard deviation of 0.1 ounces when a sample of n=100 observations was studied. Calculate the range within which the population average volume can be found with 99% confidence. Assuming that s=0.1 ounces cannot be reduced and a sample size of n=100 what is the minimum range within which the sample average weight must be found to justify with 99% confidence the advertised weight of 16 oz? Is the company justified in claiming an advertised product weight of 16 oz?