Answer all 3 questions

A certain school has 210 male students. The school nurse would like to know how many calories the male students consume per day. So, she samples 45 male students and finds that the mean calorie consumption of the 45 is 2550 calories per day with a standard deviation of 450 calories per day. Find the 90 % confidence interval for mean calorie intake of all the male students in the school. Answer the following questions: 1. Multiple choice: Which equation would you use to solve this problem? A. 8 - Z