What is the measure of ∠ABD?

A.
4°
B.
9°
C.
21°
D.
27°
E.
36°

A.

4°

B.

9°

C.

21°

D.

27°

E.

36°

Step-by-step explanation:

A. The 99% confidence interval for the difference in the proportion of all dinner customers and all lunch customers who are served within 2 minutes is between -0.195 and 0.289. (0.714 - 0.667) ± 2.576*(√0.714(1- 0.714)/35 + 0.667(1- 0.667)/75).

B. Since the confidence interval contains 0, we cannot conclude that the proportion of customers served within 2 minutes of placing their order is greater during lunch hours than during dinner hours.

Step-by-step explanation:

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