In a study of media usage versus education level (American Demographics, Vol. 17, No. 6), an index was used to measure media usage, where a measurement of 100 represents the U.S. average. Values above 100 represent above-average media usage.

(a) List the factors and the number of levels of each factor.

(b) Assume there is no interaction between the factors. Use two-way ANOVA and the following Minitab printout to determine if there is a difference in population mean index based on education. Use a = 0.05.

(c) Determine if there is a difference in population mean index based on media. Use a = 0.05.

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Media Cable Prime-Time Newspaper Magazine Education Level Less than high school High school graduate Some college College graduate Network 80 103 107 108 TV 112 105 94 90 Radio 87 100 106 106 85 101 107 108 76 105 116 Minitab Printout for Media/Education Data Analysis of Variance for Index Source DF Edu Media Error Total MS 961 320 0.075 2.96 0.01 4 12 19 1.000 1299 2264 108