| 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 |
|
|
|
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.)
◦
Since interaction is present, there is some problem with determining whether dosage affects growth rate.
◦
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.
◦
It appears that dosage does have some effect on the growth rates of the animals.
◦
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.
