7. A cheese processing company wants to estimate the mean cholesterol content of all one-ounce servings of cheese. The estimate must be within 0.5 milligram of the population mean. a. Determine the minimum sample size required to construct a 95% confidence interval for the population mean. Assume the population standard deviation is 2.8 milligrams. b. Repeat part (a) using a 99% confidence interval. c. Which level of confidence requires a larger sample size? Explain