Chapter 4.6, Problem 2E

A set of $n=8$ ordered pairs has the following sums:

${\displaystyle \sum x=111}$	${\displaystyle \sum x^2=1,869}$		${\displaystyle \sum y=618}$
${\displaystyle \sum y^2=49,374}$		${\displaystyle \sum xy=7,860}$

a. Find the line of best fit.

b. Predict the value of $y$ when $x=8$.

c. Predict the value of $x$ when $y=70$.

d. Find the coefficient of linear correlation.

e. Are the predictions in parts (b) and (c) reliable?

Why or why not?