Business Statistics: A First Course (7th Edition)
7th Edition
ISBN: 9780321979018
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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The U.S. Postal Service is attempting to reduce the number of complaints made by the public against its workers. To facilitate this task, a staff analyst for the service regresses the number of complaints lodged against an employee last year on the hourly wage of the employee for the year. The analyst ran a simple linear regression in SPSS. The results are shown below.
What proportion of variation in the number of complaints can be explained by hourly wages?
From the results shown above, write the regression equation
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee?
A FIFA World Cup football is dropped from 35 different heights (in cm) and the
height of the bounce is recorded (in cm.) The regression analysis gives the model
bounce = -0.1 +0.70 drop. Predict the height of the bounce if dropped from 64 cm.
44.7 cm
44.8 cm
64.6 cm
91.57 cm
44.9 cm
Armer Company is accumulating data to use in preparing its annual profit plan for the coming year. The cost behavior pattern of the maintenance costs must be determined. The accounting staff has suggested the use of linear regression to derive an equation for maintenance hours and costs. Data regarding the maintenance hours and costs for the last year and the results of the regression analysis follow:
Month
Maintenance Cost
Machine Hours
Jan.
$
5,050
820
Feb.
3,850
660
Mar.
4,450
740
Apr.
3,670
640
May
5,200
840
June
3,810
650
July
3,880
660
Aug.
5,320
940
Sept.
5,110
830
Oct.
4,900
810
Nov.
4,150
690
Dec.
4,010
680
Sum
$
53,400
8,960
Average
$
4,450
$
747
Average cost per hour
$
6.00
a (intercept)
$
194.33
b (coefficient)
6.2201
Standard error of the estimate
144.247
R-squared
0.9517
t-value for b
14.030…
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