A Study Examined the Effect of Life Experience on Predator

Multiple Choice

A study examined the effect of life experience on predator recognition in New Zealand robins. Researchers selected a random sample of continental robins and an independent random sample of island robins. Rats are a natural predator for the continental robins but not for these island robins (due to the recent eradication of rats on the island) . The robins were offered five worms either next to a wooden box or next to a fake rat. The time (in minutes) it took each robin to eat all five worms was recorded. The mean eating times are shown for all combinations of location (continental or island) and stimulus (wooden box or fake rat) .
$$\begin{array} { | l | l | l | } \hline & \text { Wooden box } & \text { Fake rat } \\\hline \text { Continental } & 0.75 & 0.45 \\\hline \text { Island } & 0.70 & 1.60 \\\hline\end{array}$$ The P-values for a two-way ANOVA test with an interaction term are as follows:
Location: 0.92
Stimulus: 0.011
Location * Stimulus: 0.022
The first step in analysis is to consider the interaction effect. Using a significance level of 0.05, what do the results suggest about the interaction effect?

A) Nonsignificant interaction effect; therefore, we can discuss the main effects separately.
B) Nonsignificant interaction effect; therefore, location and stimulus do not influence mean eating time in robins.
C) Significant interaction effect; therefore, we can discuss the main effects separately.
D) Significant interaction effect; therefore, we should discuss the main effects together.