Wilfley and colleagues (2008) tested whether the antiobesity drug sibutramine wo

Question

Wilfley and colleagues (2008) tested whether the antiobesity drug sibutramine would be an effective treatment for people with binge eating disorder. They measured the frequency of binge eating every 2 weeks for 24 weeks during treatment. The following table lists a portion of the data similar to results reported by the authors for the frequency of binge eating over the first 8 weeks of the drug treatment.

(a) Complete the F-table. (Round your answers to two decimal places.)

Frequency of Binge Eating Baseline Week 2 Week 4 Week 6 Week 8 4 1 0 0 1 6 4 2 0 0 3 0 1 1 0 1 1 0 1 1 2 2 1 1 1 5 1 2 2 2

Explanation / Answer

Ans:

Two-way ANOVA: Binge versus Between groups, between person

Source DF SS MS F P
Between groups 4 30.8000 7.70000 6.31 0.002
between person 5 12.2667 2.45333 2.01 0.121
Error 20 24.4000 1.22000
Total 29 67.4667

S = 1.105 R-Sq = 63.83% R-Sq(adj) = 47.56%

Conclusion: Between groups: The calculated p-value of group effect is 0.002 and less than 0.05 level of significant. Hence, there is significant different of frequency of binge eating between the weeks.

Betwwen the Persons: The calculated p-value is 0.121 and larger than 0.05 level of significant. Hence, ther is no significnat different of frequency of binge eating between the persons.   

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