Module Nine Quiz
A researcher conducted an experiment on the effects of a new multivitamin on energy level, with a control group (received nothing), a placebo group, and an experimental group (received the multivitamin). An energy inventory that provided a measure of energy level on a 50-point scale was used, where 50 indicated an individual who feels high levels of a lack of energy. The ANOVA summary table follows, together with the mean energy level score for each condition.
Source
df
SS
MS
F
Between groups
1,202.313
Within groups
2118.00
------
Total
3,320.313
Drug Condition
Mean
N
Control
36.26
15
Placebo
33.33
Multivitamin
24.13
a) Complete the ANOVA summary table.
b) Is fobt significant at a = .05?
c) Perform post hoc comparisons if necessary.
d) What conclusions can be drawn from the F- ratio and the post hoc comparisons?
e) What is the effect size, and what does it mean?
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