The Better Health Cereal Company produces Healthy Oats cereal. A sample of 15 boxes of this cereal indicates that the mean weight of a box of cereal is 24 oz with a standard deviation of 1 oz. Construct a 99 % confidence interval for the population mean weight. Compare your answer to your answer in question 47. Why are they different?

Question 47

Suppose a random sample of 30 college students reveals that the mean amount of money spent on textbooks each semester is $ 145 with a standard deviation of $25. Construct a 90 % confidence interval for the mean amount of money that students spend on textbooks each semester.