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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