How satisfied are you with your current mobile-phone service provider? Surveys done by Consumer Reports indicate that there is a high level of dissatisfaction among consumers, resulting in high customer turnover rates.10 The following table shows the overall satisfaction scores, based on a maximum score of 100, for four wireless providers in four different cities.

a. What type of experimental design was used in this article? If the design used is a randomized block design, what are the blocks and what are the treatments?

b. Conduct an analysis of variance for the data.

c. Are there significant differences in the average satisfaction scores for the four wireless providers considered here?

d. Are there significant differences in the average satisfaction scores for the four cities?

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San Chicago Dallas Philadelphia Francisco 61 AT&T Wireless Cingular Wireless Sprint Verizon Wireless 66 63 64 67 64 60 73 60 61 73 60 71 68 75