Question: It is common practice in the advertising business to create several different advertisements and then ask a random sample of potential customers to rate the

It is common practice in the advertising business to create several different advertisements and then ask a random sample of potential customers to rate the ads on several different dimensions. Suppose that an advertising firm developed four different ads for a new breakfast cereal and asked a sample of 400 shoppers to rate the believability of the advertisements. One hundred people viewed ad 1, another 100 viewed ad 2, another 100 saw ad 3, and another 100 saw ad 4. The ratings were Very believable (4), Quite believable (3), Somewhat believable (2), and Not believable at all (1). Can the firm’s management conclude that differences exist in believability between the four ads?

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