Violent Crimes: Prisons Does prison really deter violent crime? Let x represent percent change in the rate of violent crime and y represent percent change in the rate of imprisonment in the general U.S. population. For 7 recent years, the following data have been obtained (Source: The Crime Drop in America, edited by Blumstein and Wallman, Cambridge University Press).

x 6.1 5.7 3.9 5.2 6.2 6.5 11.1 y 1.4 4.1 7.0 4.0 3.6 0.1 4.4 Complete parts

(a) through (e), given x 5 44.7, y 5 17.4, x2 5 315.85, y2 5 116.1, xy 5 107.18, and r < 0.084.

(f) Critical Thinking Considering the values of r and r2, does it make sense to use the least-squares line for prediction? Explain.