The incubation periods for different, common bird families of the type Hole Nesters have a standard deviation of 6.8 days. The incubation periods for a sample of five different, common bird families of the type Open Nesters have a standard deviation of 2.0. Use a 0.05 significance level to test the claim that Open Nesters have less variation of incubation period than Hole Nesters. Can you suggest a biological explanation for your result?
Use the traditional method to test the given hypotheses. Follow the steps outlined in Figure 7-4, and draw the appropriate graph. In all cases, assume that the population is normally distributed and that the sample has been randomly selected.