A smart phone is a mobile phone that offers more advanced computing ability and connectivity than a contemporary basic "feature phone." The data that follow are the ratings for six smart phones from each of the four suppliers, three of which cost $150 or more and three of which cost less than $150.9 The ratings have a maximum value of 100 and a minimum of 0.

a. What type of experiment was used to evaluate these smart phones? What are the factors? How many levels of each factor are used in the experiment?
b. Produce an analysis of variance table appropriate for this design, specifying the sources of variation, degrees of freedom, sums of squares, mean squares, and the appropriate values of F used in testing.
c. Is there significant interaction between the two factors?
d. Is there a main effect due to suppliers? What is its p-value?
e. Is there a main effect due to cost? What is its p-value?
f. Summarize the results of parts c-e.

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Supplier AT&T Sprnt T-Mobile Verizon Cost $150 76 74 69 69 67 64 74 69 68 69 64 60 72 71 71 71 71 70 75 73 73 72 71 70 Cost$150