As a quality control measure, a cola company wants to test if the mean amount of cola in their 16 ounce bottles differs from 16 ounces. A simple random sample of 36 bottles is taken resulting in a sample mean of 15.98 and a sample standard deviation of 0.04. At 0.05 level of significance, is there enough evidence that the mean amount of cola in 16 ounce bottles differs from 16 ounces? Conduct the test by using a. the 8-step rejection region approach; b. the p-value and c. a confidence interval