The superintendent of a school district must decide whether to hire additional teachers. If she hires the teachers, the student-teacher ratio will drop by 2, and student performance will improve. Under the assumption that student performance is measured by a test score, she estimated a regression model using the test score as the dependent variable, and the student- teacher ratio as the independent variable. The intercept and the coefficient are estimated to be 100 and -2, respectively. If she hires additional teachers to reduce the ratio by 2, what would be its predicted effect on the test score? O a. The test score will increase by 2 points. O b. The test score will decrease by 100 points. O C. The test score will increase by 98 points. O d. The test score will increase by 4 points. O e. The test score will decrease by 2 points