Biology Forums - Study Force

Source	df	SS	MS	F	Pp
Dosage	2	228.167	114.083	42.78	0.000
Type	1	0.333	0.333	0.12	0.736
Interaction	2	13.167	6.583	2.47	0.165
Error	6	16.000	2.667
Total	11	257.667

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A growth hormone was given in three different doses to two types of animals. A two-way ANOVA procedure was conducted that evaluated the change in growth rates across the various dosage/type combinations. What is the appropriate conclusion based on the output shown here? (Useα= 0.05.)

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Since interaction is present, there is some problem with determining whether dosage affects growth rate.

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Although interaction is present, we can still determine that the different types of chimpanzees have differing growth rates becauseH₀is not rejected for the type factor.

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It appears that dosage does have some effect on the growth rates of the animals.

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Since interaction is not present, we can safely say that the relationship between dosage and growth rate is different for the different types of animals.

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