1. the minnesota dept. of transportation hoped that they could measure the weights of big
trucks without actually stopping the vehicles by using a newly developed "weight-in-
motion" scale. to see if the new device was accurate, they conducted a calibration test.
they weighed several trucks when stopped (static weight). they weighed them again
while the trucks were moving to see how well the new scale could estimate the weight. a
regression printout is shown below:
the regression equation is
static weight = 10.9 + 0.638 weight in motion (thousands of pounds)
predictor
constant
weight i
coef
10.854
0.63791
stdev
1.982
0.06103
т
5.48
10.45
0.001
0.000
s = 1.041
r-sq = 93.2%
r-sq(adj) = 92.3%
a) what is the correlation coefficient?