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ANOVA

12. A researcher reports an F-ratio with df = 3, 36 from an independent-measures research study.

a. How many treatment conditions were compared in the study?

b. What was the total number of participants in the study?

16. A pharmaceutical company has developed a drug that is expected to reduce hunger. To test the drug, three samples of rats are selected with n = 10 in each sample. The first sample receives the drug every day. The second sample is given the drug once a week, and the third sample receives no drug at all. The dependent variable is the amount of food eaten by each rat over
a 1-month period. These data are analyzed by an ANOVA, and the results are reported in the following summary table. Fill in all missing values in the table. (Hint: Start with the df column.)

Source SS df MS

Between treatments 15 F = 7.50

Within treatments

Total

18. The following data were obtained from an independent measures research study comparing three treatment conditions. Use an ANOVA with ?=.05 to determine whether there are any significant mean differences among the treatments.

Treatment
I II III

2 5 7 N =14
5 2 3 G =42
0 1 6 ?X^2 = 182
1 2 4
2
2

T = 12 T =10 T =20
SS = 14 SS = 9 SS = 10

Solution Summary

The solution provides step by step method for the calculation of ANOVA and missing values in an ANOVA table. Formula for the calculation and Interpretations of the results are also included.

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