The marketing manager at YumYum, a large deli chain, is testing the effectiveness of four potential advertising strategies. After a two-week trial period for each advertising strategy, sales were determined. However, since some store locations have higher customer traffic than other locations, the effect of location on sales must be controlled for within the sample. The accompanying table shows sales (in thousands of dollars) achieved over the 2-week trial period using each advertising strategy at three different store locations.

a. Use Excel to generate the appropriate ANOVA table at the 5% significance level.
b. At the 5% significance level, can you conclude that the mean sales differ among the advertising strategies? What about the 10% significance level?
c. At the 5% significance level, can you conclude that the mean sales differ across the store locations?
d. If significant differences exist across advertising strategies, use Fisher's LSD method at the 10% significance level to find which strategies have different mean sales.

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Advertising Strategy (Factor A) Store Location Newspaper Internet Factor B) only City Suburban Rural only 644 548 298 TV only 585 503 347 Internet & TV 712 614 421 458 388