Question: In the Preview for this chapter, we discussed a study that examined the effect of eye spot patterns on the behavior of moth-eating birds (Scaife, 1976). The birds were tested in a box with two chambers and were free to move from one chamber to another. In one chamber, two large eye-spot were painted on one wall. The other chamber had plain wall. The researcher recorded the amount of time each bird spent in the plain chamber during a 60-minute session. Suppose the study produced a mean of M=37 minutes on the plain chamber with SS=288 for a sample of n=9 birds.

a. Is this sample sufficient to conclude that the eye-spot have a significant influence on the birds’ behavior? Use a two-tailed test with α=0.5.

b. Compute the estimated Cohen’s d to measure the size of the treatment effect.