To examine the calming effect of pets during stressful situations, you recruited

Question

To examine the calming effect of pets during stressful situations, you recruited 52 children who owned pets and had them perform a stressful task. You randomly assigned the children into three treatment groups and had them perform the task either alone (control group), with a parent, or with their pet present. Their heart rate (in beats per minute) during the task was recorded and you calculated SStreatment = 1987.3 and SStotal = 6219.1.

Do pulse rates differ across the three treatments? Carry out the appropriate test to answer this question and include all steps for full credit.

Calculate the appropriate fit statistic for your analysis and interpret it in the context of the problem.

Explanation / Answer

Sol:

Ho:All the three group means are equal.

H1:Atleast one of the group means are different.

alpha=.05

F=11.505

P=0.00008

p<0.05

Reject Null hypothesis.

Accept alternative hypothesis.

There is sufficient statistical evidence at 5% level of significance to conclude that

pulse rates differ across the three treatments.

pulse rates differ across the three treatments

ANOVA Source of Variation SS df MS F P-value F crit Between treatments 1987.3 2 993.65 11.50547 0.00008 3.187 Within treatments 4231.8 49 86.36327 Total 6219.1 51

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