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Mgmt 305
Homework 5
Due:
April 27, 2011
Quiz: April 27, 2011
1.
In a manufacturing process the assembly line speed (feet per minute) was thought to affect
the number of defective parts found during the inspection process.
To test this theory,
managers devised a situation in which the same batch of parts was inspected visually at a
variety of line speeds.
They collected the following data.
Line Speed
Number of Defective
Parts Found
20
21
20
19
40
15
30
16
60
14
40
17
a.
Develop the estimated regression equation that relates line speed to the number of
defective parts found.
b.
At a .05 level of significance, determine whether line speed and number of defective
parts found are related.
c.
Did the estimated regression equation provide a good fit to the data?
d.
Develop a 95% confidence interval to predict the mean number of defective parts for
a line speed of 50 feet per minute.
2.
A microcomputer manufacturer has developed a regression model relating his sales (Y in
$10,000s) with three independent variables.
The three independent variables are price
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 Spring '08
 Priya

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