Born to be old? Is there a relationship between the gestational period (time from conception to birth)

of an animal and its average life span? The figure shows a scatterplot of the gestational period and average life span for 43 species of animals.30

(a) Describe the association shown in the scatterplot.

(b) Point A is the hippopotamus. What effect does this point have on the correlation, the equation of the least-squares regression line, and the standard deviation of the residuals?

(c) Point B is the Asian elephant. What effect does this point have on the correlation, the equation of the least-squares regression line, and the standard deviation of the residuals?

Transcribed Image Text:

40 A .B 30 Life span (years) 20 20 10 10 0 100 200 300 400 500 600 700 Gestation (days)