Question

# For each of the following two-samples t-tests (problems 1-6): (a) Determine if a F test for...

For each of the following two-samples t-tests (problems 1-6): (a) Determine if a F test for the ratio of two variances is appropriate to calculate for the context. If it is appropriate, conduct the analysis and report the result. Include what statistical conclusion you should draw from the analysis (i.e., whether you should conduct a pooled-variance t-test or an unequal-variances t-test). (b) Identify the most appropriate t-test to conduct for the situation/data given. Don’t forget to consider if the context requires one/two-tail tests. (c) Provide a statistical and practical interpretation of your findings.

3. How does cellphone service compare between different cities? The data stored in CellService represents the rating of Verizon and AT&T in 22 different cities (Data extracted from “Best Phones and Services,” Consumer Reports, January 2012, p. 28, 37). Is there evidence of a difference in the mean cellphone service rating between Verizon and AT&T? (Use a 0.05 level of significance)

 City Verizon AT&T Atlanta 56 74 Austin 61 72 Boston 60 69 Chicago 55 73 Dallas-Fort Worth 65 76 Denver 56 72 Detroit 63 73 Houston 59 77 Kansas City 66 74 Los Angeles 56 73 Miami 61 74 Milwaukee 60 74 Minneapolis-St.Paul 60 71 New York 57 71 Philadelphia 63 71 Phoenix 62 76 San Diego 60 74 San Francisco 53 73 Seattle 59 72 St. Louis 64 73 Tampa 67 73 Washington D. C. 60 71

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