1. In fitting a least squares line ton= 20data points, the following quantities were computed:ni=1(xix)2= 83,ni=1(yiy)2= 198ni=1(xix)(yi) =108,x = 2.3, andy = 35.

(a) Find the least squares line

(b) Graph the least squares line and specify the slope and intercept in the graph.

(c) Calculate SSE.

(d) Calculate sample variance of error terms.

(e) Find a 95% confidence interval for the slope. Interpret this estimate. (f) Find a 90% prediction interval for y when x = 15.