# Consider the problem of how to test which form of advertising is best to promote the sale of a…

Consider the problem of how to test which form of advertising is best to promote the sale of a product:

A 15-week test period is selected for the test, with each form of advertising being used for five different weeks and the increase in the total weekly sales compared. The particular weeks used for each type of advertising have been selected randomly from the 15 possible weeks. The gain of sales is determined by subtracting the sales from the expected sales for the week if there had been no advertising. This difference is the response variable Y of our experiment. We can tabulate the results of the experiment in Table 31.13, which is a one-way table:

Using this data, test the hypothesis that the average response is the same for each form of advertising. If you discard this null hypothesis, use the least significant difference technique to determine if one form of advertising is superior to either of the other two.

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