Module Nine Quiz

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	15
Multivitamin	24.13	15

a)

Module Nine Quiz

Complete the ANOVA summary table.

b)
Is f_obt 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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