Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories per serving:
130 160 150 120 120 110 170 160 110 130 90
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.