Define hypotheses Find the critical value and rejection region using alpha = .05. Fill in the ANOVA summary table to calculate the test statistic F Source SS df MS F Between Within Total 4. Calculate eta2 as the effect size 5. Make a statistical decision regarding the hypothesis based on your results and write a conclusion statement summarizing the results. Be sure to include eta2 in the summary and interpret its magnitude.
Researchers were interested in whether certain health behaviors can reduce the number of sick days employees take. Employees were randomly assigned to three groups, with a separate sample of n = 10 in each group. Group 1 was asked to eat 5 servings of fruits and vegetables a week for a year. Group 2 was asked to eat 5 servings of fruits and vegetables a week, as well as exercise 5 times a week, for a year. Group 3 served as the control group; they were not asked to change their behaviors. At the end of the year, the researchers compared the number of sick days.
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Healthy Diet |
Healthy Diet & Exercise |
Control |
∑X = 156 ∑X2 = 860 |
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M1 = 5.00 |
M2 = 4.40 |
M3 = 6.20 |
N = 30 |
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S1 = 1.05 |
S2 = 1.07 |
S3 = 1.15 |
k = 3 |
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SS1 = 10.00 |
SS2 = 10.40 |
SS3 = 11.80 |
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T1 = 50.00 |
T2 = 44.00 |
T3 = 62.00 |
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- Define hypotheses
- Find the critical value and rejection region using alpha = .05.
- Fill in the ANOVA summary table to calculate the test statistic F
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Source |
SS |
df |
MS |
F |
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Between |
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Within |
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Total |
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4. Calculate eta2 as the effect size
5. Make a statistical decision regarding the hypothesis based on your results and write a conclusion statement summarizing the results. Be sure to include eta2 in the summary and interpret its magnitude.
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