Butterfly wings:Do larger butterflies live longer? The wingspan (in millimeters) and the lifespan in the adult state (in days) were measured for 22 species of butterfly. Following are the results:

Wingspan Lifespan Wingspan Lifespan

35.5 19.8 25.9 32.5

30.6 17.3 31.3 27.5

30.0 27.5 23.0 31.0

32.3 22.4 26.3 37.4

23.9 40.7 23.722.6

27.7 18.3 27.1 23.1

28.8 25.9 28.1 18.5

35.9 23.1 25.932.3

25.4 24.0 28.8 29.1

24.6 38.8 31.4 37.0

28.1 36.5 28.5 33.7

a. Compute the least-squares regression line for predicting the lifespan from the wingspan.

c. If the wingspans of two butterflies differ by 2 millimeters, by how much would you predict their lifespans to differ?