Answer
69
Work Step by Step
r=0.687, n=40. r is larger than the critival values in the table (r=0.312 and r=0.402) found in row n=40, hence r indicates a linear correlation. Hence we can use the equation: $\hat{y}=b_0+b_1x=47.4+0.18\cdot 120=69.$
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 10 - Correlation and Regression - 10-3 Regression - Basic Skills and Concepts - Page 528: 5
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