Income: Media Usage In the same study described in Problem 4, media usage versus household income also was considered. The media usage indices for the various media and income levels follow.

Minitab Printout for Media/Education Data Analysis of Variance for Index Source DF SS MS F P Edu 3 961 320 2.96 0.075 Media 4 5 1 0.01 1.000 Error 12 1299 108 Total 19 2264.

Income Level Media Streaming Movies Online Gaming Streaming Music Online Forums Social Media Less than $20,000 78 112 89 80 91 $20,000–$39,999 97 105 100 97 100 $40,000–$74,999 113 92 106 111 105 $75,000 or more 121 94 107 121 105.

(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 income. Use a 5 0.05.

(c) Determine if there is a difference in population mean index based on media. Use a 5 0.05.

Minitab Printout for Media/Income Data Analysis of Variance for Index Source DF SS MS F P Income 3 1078 359 2.77 0.088 Media 4 15 4 0.03 0.998 Error 12 1558 130 Total 19 2651.

AppendixLO1