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Name
KEY
Exam 2
ID #
Spring 2006
Lab Instructor
Form A
Lab Meeting Time
Students must show all work on problems that involve calculation, even if the answer is multiple
choice.
Questions 1 – 4 refer to the following.
A time study at a large automobile assembly plant was undertaken to determine the average time
required to assemble an automobile.
A random sample of 15 completed automobiles gave a
mean assembly time of 12.2 hours and a standard deviation of 2.4 hours.
Assume automobile
assembly times are normally distributed.
1.
Construct a 95 percent confidence interval for the population mean assembly
time for automobiles.
a.
(10.8241 ,
13.5759)
b.
(10.8708 ,
13.5292)
*
c.
(10.9428 ,
13.4572)
d.
(10.9854 ,
13.4146)
2.
Write an interpretation of the confidence interval that was computed in problem 1.
In a repeated sampling procedure, 95 percent of the intervals computed in this manner
will contain the true population mean
μ
.
1
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 Spring '08
 HUDGINS

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