A scientist is researching whether or not birds of prey exposed to pollutants lay eggs with thinner shells. He collects a random sample of egg shells from each of 6 different nests and tests for pollutant level, p, and measures the thinning of the shell, t. The results are shown in the table below. P 3 8 30 25 15 12 1 3 9 10 5 6 [You may use p = 1967 and Ept = 694] A scatter graph is drawn for these data. 11 10 9 8 7 6 5 4 1 321C 3 2 0 5 10 15 20 25 P t=0.318p+0.741 30 35 Explain why a linear regression model may be appropriate to describe the relationship between p and t.