A study compared weight loss between patients on diet A and patients on diet B. Patients on diet A lost a mean of 7.7

pounds in six months, whereas patients on diet B lost a mean of 7.4

pounds in six months. Suppose that the study was based on a sample of 700

patients on diet A and 700

patients on diet B, and the standard deviation of the amount lost was 3.7

pounds for diet A and 3.4

pounds for diet B. Complete parts (a) through (d).

State the null and alternative hypotheses if you want to test whether the mean weight loss between the two diets is equal. What are the null and alternative hypotheses?

Let 1

represent the mean number of pounds patients on diet A lose in six months and 2

represent the mean number of pounds patients on diet B lose in six months. Choose the correct answer below.

A.

H0:

mu 1 not equals mu 212

Upper H 1H1:

mu 1 equals mu 21=2

B.

Upper H 0H0:

mu 11greater than or equalsmu 22

Upper H 1H1:

mu 11less than<mu 22

C.

Upper H 0H0:

mu 11less than or equalsmu 22

Upper H 1H1:

mu 11greater than>mu 22

D.

Upper H 0H0:

mu 1 equals mu 21=2

Upper H 1H1:

mu 1 not equals mu 212