A survey was conducted to examine the effects of pharmaceutical drug advertising on physician practices. Self-administered questionnaires were delivered to randomly selected physicians in various practice types: general practice, family practice, and internal medicine. Physicians reported on their attitude toward drug advertising and on the influence of drug advertising on their prescription-writing habits. Likert Scale measurements were used in the survey (1 = Strongly disagree, 5 = Strongly agree; the higher the score, the more favorably disposed the respondent is to advertising). The sample data are presented in the following table and in the accompanying computer output.

a. Suppose that an ANOVA is to be performed to compare the average attitude toward advertising for the different practice types. State precisely the ANOVA model for these data.
b. Complete the ANOVA table in the computer output for the model in part (a).
c. Test whether the physician types differ significantly in average attitude toward advertising.
d. Use Scheffe's method to locate differences between pairs of means.
e.-h. Repeat parts (a)-(d) with regard to influence on prescription-writing habits.
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Attitude toward Advertising 3, 4, 4, 4, 4,3 Influence on Prescription- Practice Type General practice Family practice Internal medicine writing Habits 4, 5, 5, 3, 5, 4 3, 2, 2, 2, 1,3 1, 2, 3,1, 11 3, 4, 2, 2, 2, 1 CLASS LEVEL INFORMATION Class Levels Values practice 3 Fam Gen Int Dependent Variable: attitude Source Model Error Corrected Total DF Sum of Squares 9.33333333 15 1266666667 17 2200000000 Mean Square F Value Pr> F 0.0159 R-Square Coeff Var Root MSEattitude Mean 0.424242 34.46012 0.918937 2.666667 Source DF Type ISS Mean Square F Value Pr> F practice SourceDF Type Ili SS Mean Square F Value Pr> F practice2 2 9.33333333 4.86666667 5.53 00159 2 9.33333333 4.86666667 5.53 0.0159 Scheffe's Test for Attitude Alpha Error Degrees of Freedom Error Mean Square Critical Value of F Minimum Significant Difference 0.05 15 0.844444 3 68232 1.4398 MEANS WITH THE SAME LETTER ARE NOT SIGNIFICANTLY DIFFERENT Schoffe Grouping Mean N practice A 3.6667 6 Gen A 2.3333 6 Fam 2.0000 6 Int