Question: B C D E 15 16 8 5 12 18 17 7 6 19 17 21 10 13 18 19 16 15 11 12 19

B C D E 15 16 8 5 12 18 17 7 6 19 17 21 10 13 18 19 16 15 11 12 19 19 14 17 20 17 14 10 14 a. At the 0.05 level of significance, is there evidence of a difference in the mean rating of the pens following exposure to five advertisements? b. If appropriate, determine which advertisements differ in mean ratings. c. At the 0.05 level of significance, is there evidence of a difference in the variation in ratings among the five advertisements? d. Which advertisement(s) should you use, and which advertisement(s) should you avoid? Explain

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