What is the effect size and what does it mean

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Reference no: EM13277211

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) 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?

Reference no: EM13277211

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