I need help figuring out correct formulas for these problems.

Traditional : 89 89 79 79 77 75 73 69 69 65

Prepaid: 86 87 82 81 78 78 74 77 75 72 68 69 65

Is there a difference in the satisfaction rating of traditional cellphone providers who bill for service at the end of a month often under a contract and prepaid cellphone service providers who bill in advance without acontract? The accompanying table contains the satisfaction rating for 10 traditional cellphone providers and 13 prepaid cellphone service providers. Complete parts(a) through(e) below.

Assuming that the population variances from both types of cellphone providers areequal, is there evidence of a difference in the mean ratings between the two types of cellphoneproviders? (Use =0.05.)

a. Let population 1 be the ratings of the traditional cellphone providers and let population 2 be the ratings of the prepaid cellphone providers. What are the correct null and alternativehypotheses?

A.

H0: 120

H1: 12>0

B.

H0: 12=0

H1: 120

C.

H0: 120

H1: 12<0

D.

H0: 120

H1: 12=0

b. What is the teststatistic?

tSTAT=

(Round to two decimal places asneeded.)

c. Whatis/are the criticalvalue(s)?

(Use a comma to separate answers as needed. Round to two decimal places asneeded.)

d. Find thep-value in(a).

p-value=

(Round to three decimal places asneeded.)

e. Choose the correct conclusion below.

A.

Reject H0. There is sufficient evidence of a difference in the mean ratings between the two types of cellphone providers.

B.

Donotreject H0. There is insufficient evidence of a difference in the mean ratings between the two types of cellphone providers.

C.

Donotreject H0. There is sufficient evidence of a difference in the mean ratings between the two types of cellphone providers.

D.

Reject H0. There is insufficient evidence of a difference in the mean ratings between the two types of cellphone providers.