Read this section and answer the questions that follows:

Suppose the average number of calories in low-calorie dinner is 600 with a standard deviation of 110 calories.Your friend sells healthy dinners at her restaurant. You believe that, in fact, the average calories for average dinner is different from 600. To test the hypothesis, you took a sample of 16 dinners at your friend's restaurant.The average for this group is 650 calories.

What is the value of the test statistic in this situation?

c. .113636

b. -1.8181818

a. 1.8181818

d. -.113636

Should the t-test be used in this situation?

yes or no