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A psychologist would like to analyze the effects of new drug on activity level of animals. Three samples of rats are selected with n = 5 in each sample. One group gets no drug, one group gets small dose, and third group gets large dose. The psychologist records activity level for each animal. The data from this experiment are given below.

No drug Small dose Large dose  
5 5 10  
3 5 12  
1 9 9 G = 90
1 6 6 ΣX2 = 678
5 5 8  
T = 15 T = 30 T = 45  
SS = 16 SS = 12 SS = 20  

 (a) Do these data point out any significant differences among three groups? Test with α = .05.

-----------------and conclude that drug------------- a significant effect on the activity level. 

(b) Evaluate η2, the percentage of variance accounted for by treatment. (Round the answer to two decimal places.)

Statistics and Probability, Statistics

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