Question
Here is one way in which nature regulates the size of animal populations: high population density attracts predators, which remove a higher proportion of the population than when the density of the prey is low. One study looked at kelp perch and their common predator, the kelp bass. On each of four occasions, the researcher set up four large circular pens on sandy ocean bottoms off the coast of southern California. He randomly assigned young perch to 1 of 4 pens so that one pen had 10 perch, one pen had 20 perch, one pen had 40 perch, and the final pen had 60 perch. Then he dropped the nets protecting the pens, allowing bass to swarm in, and counted the number of perch killed after two hours. A regression analysis was performed on the 16 data points using = number of perch in pen and = proportion of perch killed. Given is a residual plot and a histogram of the residuals.
Are the conditions for performing inference about the slope met?
A)The conditions are met.
B)The residual plot has a high degree of variability. The Equal Standard Deviation condition is not met.
C)Because subjects were not randomly assigned to treatments, the Random condition is not met.
D)The residual plot shows that the Linear condition is not met.
E)The histogram of the residuals has an outlier. The Normal condition is not met.
