57 FCAT scores and poverty. Refer to the Journal of Educational and Behavioral Statistics (Spring 2004) study of scores on the Florida Comprehensive Assessment Test

(FCAT), first presented in Exercise 26 . Consider the simple linear regression relating math score ( y ) to percentage

( x ) of students below the poverty level. The data are saved in the FCAT file.

a. Test whether y is negatively related to x . Use a = .01.

b. Construct a 99% confidence interval for b1. Interpret the result practically.