The marketing group at Buy4Less, a local retail chain, is examining the effect of advertising at various times of day and on various local television channels. Based on 12-week cycles (4 time periods x 3 local channels), three observations (cycles) of weekly sales data have been obtained for each time period channel combination. The results (in thousands of dollars) are shown in the accompanying table.

a. Use Excel to generate the appropriate ANOVA table at the 5% significance level.
b. At the 5% significance level, can you conclude that there is interaction between the time of day and the local channel used for advertising?
c. Are you able to conduct tests based on the main effects? If yes, conduct them at the 5% significance level. If no, explain why.

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Local Channel Moming Mid-Day Evening Late Night (Factor B) (6am-11am) (11am-5pm) (5pm-10pm) (10pm-2am) WTZX Time of Day (Factor A) 69.6 74.6 72.8 70.1 68.4 70.0 76.1 75.3 68.7 84.4 79.9 73.8 84.7 80.0 82.8 76.0 83.5 71.7 83.9 85.9 78.0 81.2 89.8 80.2 76.3 81.4 81.2 60.0 63.0 58.3 64.4 69.7 67.9 56.7 68.2 64.4 WABC WXAQ