Jointsoft is a great overthecounter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get their messages across. Currently, their best modes of advertisement are commercials on daytime TV, advertisements in select magazines, iers in convalescent homes, and advertisements on certain Web pages. Maiketing managers for Jointsoft are investigating these four modes of advertisement in four small communities [with a different mode of advertisement in each community). The marketing managers have selected 45 days at random and are looking at the daily sales (in dollars) in each of the communities on each of these days. Here is what they have to work with. Sample Sample Sample Groups size mean variance W 45 574.4 27 38. 1 Magazines 45 567.2 4359.2 Fliers 45 554. 9 2488. 3 Web pages 45 552.4 1748.0 I: Send data to calculator V Send data to Excel] Suppose that the marketing managers perfom1 a one-wayr independentsamples ANOVA test to decide if there are differences in the mean daily sales arising from the four modes of advertisement. (So, they're assuming that the only difference among the four communities is the mode of advertisement used in it.) Such a test uses the following statistic. Variation between the samples Variation within the samples For the information in the chart above, F 21.71. (a) Give the pvalue corresponding to this value of the [D F statistic. Round your answer to at least three decimal places. (b) Using the 0.10 level of significance, can the marketing managers conclude that the mean daily sales arising from at least one ofthe modes of advertisement differs from the others? OYes ONo