Access the data file Crime2 shown in Table 9.1.

Let y = violent crime rate and x = poverty rate.

(a) Using software, show that the prediction equation is

ˆy = 209.9+25.5x. Interpret the y-intercept and the slope.

(b) Find the predicted violent crime rate and the residual for Massachusetts, which had x = 10.7 and y = 805.

Interpret.

(c) Two states differ by 10.0 in their poverty rates. Find the difference in their predicted violent crime rates.

(d) From the prediction equation, can you tell the sign of the correlation between these variables? How?