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A psychologist would like to examine the effects of sugar consumption on the activity level of preschool children. Three samples of children are...
A psychologist would like to examine the effects of sugar consumption on the activity level of preschool children. Three samples of children are selected with n = 5 in each sample. One group gets no sugar, one group gets a small dose, and the third group gets a large dose. The psychologist records the activity level for each child. The data from this experiment are presented below.
No sugar Small dose Large dose
5 3 6
3 3 8
1 7 5 G = 60
1 4 2 ΣX2 = 298
5 3 4
T = 15 T = 20 T = 25
SS = 16 SS = 12 SS = 20
a. Fill in the ANOVA table below:
Source SS df MS F
b. Do these data indicate any significant differences among the three groups? Test with α = .05.
Fcritical = _____________
Decision = _____________
c. Compute η2 , the percentage of variance accounted for by the treatment.
η2 = ______________
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