Potential jurors. Here are descriptive statistics and a scatterplot for the reporting percents in 2003 and 2004 from Table 27.2.

(a) Use the descriptive statistics to compute the least-squares regression line for predicting the reporting percent from the coded reporting date in 2003.

(b) Use the descriptive statistics to compute the least-squares regression line for predicting the reporting percent from the coded reporting date in 2004.

(c) Interpret the value of the slope for each of your estimated models.

(d) Are the two estimated slopes about the same?

(e) Would you be willing to use the multiple regression model with equal slopes to predict the reporting percents in 2003 and 2004? Explain why or why not.

(f) How does the estimated slope in 2003 compare with the estimated slope obtained in Example 27.3 for 1998 and 2000?
(g) Based on the descriptive statistics and scatterplots provided in Exercise 27.3, Example 27.1, and on page 27-10, do you think that the jury commissioner is happy with the modifications he made to improve the reporting percents?