Chapter 1.5, Problem 7E

COLLEGE ADMISSIONS The accompanying data were compiled by the admissions office at Faber College during the past 5 years. The data relate the number of college brochures and follow-up letters $\left(x\right)$ sent to a preselected list of high school juniors who had taken the PSAT and the number of completed applications $\left(y\right)$ received from students (both measured in units of a thousand).

x	4	4.5	5	5.5	6
y	0.5	0.6	0.8	0.9	1.2

a. Determine the equation of the least-square line for these data.

b. Draw a scatter diagram and the least-square line for these data.

c. Use the result obtained in part $\left(\text{a}\right)$ to predict the number of completed applications expected if 6400 brochures and follow-up letters are sent out during the next year.