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 a contract? The satisfaction rating summary statistics for 100 traditional cellphone providers and 130 prepaid cellphone service provider are below: Branch n x¯ S2 Prepaid 100 76.85 49.97 Traditional 130 76.40 60.49 Let μ1 be the average ratings of the traditional cellphone providers and let μ2 be the average ratings of the prepaid cellphone providers. What is the appropriate test to perform for the following hypothesis? H0:μ1−μ2=0H0:μ1−μ2≠0