Suppose You Fit a Least Squares Line to 23 Data $0.495$

Essay

Suppose you fit a least squares line to 23 data points and the calculated value of SSE is $0.495$ .
a. Find $s ^ { 2 }$ , the estimator of $\sigma ^ { 2 }$ .
b. What is the largest deviation you might expect between any one of the 23 points and the least squares line?