Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories per serving: a)

Question:

Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories per serving:

a) Check the assumptions and conditions for inference.
b) Create a 95% confidence interval for the average calorie content of vanilla yogurt.
c) A diet guide claims that you will get an average of 120 calories from a serving of vanilla yogurt. What does this evidence indicate? Use your confidence interval to test an appropriate hypothesis and state your conclusion.