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# ANOVA

See attached file for proper format and symbols.

1. A researcher investigated the number of viral infections people contract as a function of the amount of stress they experienced during a 6-month period. She obtained the following data:
Amount of Stress
Negligible Stress Minimal Stress Moderate Stress Severe Stress
2 4 6 5
1 3 5 7
4 2 7 8
1 3 5 4

A.) What are H0 and Ha?
B.) Compute Fobt and complete the ANOVA summary table.
C.) With &#945;=.05, what is the Fcrit?
E.) Perform the appropriate post hoc comparisons.
G.) Describe the effect size and interpret it.
H.) Estimate the value of ยต that is likely to be found in the severe stress condition.

2. In a study in which k =3, n =21, 1=45.3, 2 = 16.9, and 3 = 8.2, you compute the following sums of squares:
Source Sum of Squares df Mean Square F
Between 147.32 _____ _____ ___
Within 862.99 _____ _____
Total 1010.31 _____

A.) Compute the ANOVA summary table.
B.) With &#945; = .05, what do you conclude about F obt?
C.) Report your results in the correct format.