2. (40 points) An experiment is designed to compare five different advertisements for a pen.

Advertisement A greatly undersells the pen. Advertisement B slightly undersells the pen.

Advertisement C slightly oversells the pen. Advertisement D greatly oversells the pen.

Advertisement E correctly states the pen. A sample of 30 adult respondents is randomly

assigned to the five advertisements. After reading the advertisement, all respondents

unknowingly receive the same pen to evaluate and are then asked to rate the pen from 1 to

7 (lowest to highest) on three characteristics. The combined scores of three ratings for the 30

respondents are represented in Q2 of the Final Exam.xlsx.

a) (20 points) 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? Determine the hypotheses.

b) (20 points) If the results in (b) indicate that the means are different, use the Tukey-Kramer

procedure to determine which groups differ in mean rating. Discuss your findings.