The paper “Postmortem Changes in Strength of Gastropod Shells” (Paleobiology [1992]: 367–377) included scatterplots of data on x = shell height (in centimeters) and y = breaking strength (in newtons) for a sample of n = 38 hermit crab shells. The least-squares line was

a. What are the slope and the intercept of this line?

b. When shell height increases by 1 cm, by how much does breaking strength tend to change?

c. What breaking strength would you predict when shell height is 2 cm?

d. Does this approximate linear relationship appear to hold for shell heights as small as 1 cm? Explain.

Transcribed Image Text:

y = -275.1 +244.9x.