I want to estimate the average age of students graduating this semester. I sample 36 students and calculate a mean age of 23. I know that the for this population is 2.5. I want to be 95% confident in my confidence interval. What is the margin of error (MOE)?

.82

.42

.07

1.96

I conduct a survey to see how many minutes a week Freshman students exercise. My sample size was 49, mean was 21 minutes a day on average, and the for this population is 19 . I want to be 95% confident in my estimate. What is the standard error?

1.96

2.71

5.32

.76