Question

Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the night shift than on the day shift. The mean number of units produced by a sample of 59 day-shift workers was 323. The mean number of units produced by a sample of 67 night-shift workers was 333. Assume the population standard deviation for the number of units produced on the day shift is 19 and is 27 on the night shift. At the 0.10 significance level, is the number of units produced on the night shift larger? a) Is this a one-tailed or two-tailed test? b) State the decision rule. c) Compute the value of the test statistic. d) What is your decision regarding Ho?

Answer #1

from above

a)

this is one tailed test

b)

Decision rule : reject Ho if test statistic z>1.28 (try z<-1.28 if this comes wrong) |

c)

value of the test statistic z =2.43 (try -2.43 if this comes wrong)

d)

reject the null since test statistic > critical value

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there are more units produced on
the night shift than on the day shift. The mean number of units
produced by a sample of 59 day-shift workers was 323. The mean
number of units produced by a sample of 67 night-shift workers was
333. Assume the population standard deviation of the number of
units produced on the day shift is 19 and 27 on the...

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there are more units produced on
the night shift than on the day shift. The mean number of units
produced by a sample of 57 day shift workers was 359. The mean
number of unts produced by a sample of 65 night shifters was 369.
Assume the population standard deciation of the number of units
produced on the day shift is 23 and 32 on...

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there are more units produced on
the night shift than on the day shift. The mean number of units
produced by a sample of 52 day-shift workers was 327. The mean
number of units produced by a sample of 58 night-shift workers was
332. Assume the population standard deviation of the number of
units produced on the day shift is 23 and 31 on the...

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there are more units produced on
the night shift than on the day shift. The mean number of units
produced by a sample of 52 day-shift workers was 355. The mean
number of units produced by a sample of 58 night-shift workers was
363. Assume the population standard deviation of the number of
units produced on the day shift is 21 and 29 on the...

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether there are more units produced on
the night shift than on the day shift. The mean number of units
produced by a sample of 54 day-shift workers was 331. The mean
number of units produced by a sample of 60 night-shift workers was
338. Assume the population standard deviation of the number of
units produced on the day shift is 19 and 26 on the...

Clark Heter is an industrial engineer at Lyons Products. He
would like to determine whether, on average, there are more units
produced on the night shift (Population n) than on the day
shift (Population d ). A sample of 52 day-shift workers
showed the mean number of units produced is 355. The
population standard deviation of
day-shift production is 21 units. A sample of 58 night-shift
workers showed that the mean number of units produced is 363. The
population standard...

1.
A recent study focused on the number of times men and women who
live alone buy take-out dinner in a month. Assume that the
distributions follow the normal probability distribution. The
information is summarized below.
Statistic
Men
Women
Sample mean
24.71
21.94
Population standard deviation
5.53
4.71
Sample size
36
41
At the .01 significance level, is there a difference in the mean
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Chapin Manufacturing Company operates 24 hours a day, five days
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At the 0.01 significance level, can we conclude there is a
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Units Produced
Employee
Day...

Chapin Manufacturing Company operates 24 hours a day, five days
a week. The workers rotate shifts each week. Management is
interested in whether there is a difference in the number of units
produced when the employees work on various shifts. A sample of
five workers is selected and their output recorded on each shift.
At the 0.05 significance level, can we conclude there is a
difference in the mean production rate by shift or by employee?
Units Produced
Employee
Day...

The null and alternate hypotheses are:
H0 : μd ≤ 0
H1 : μd > 0
The following sample information shows the number of defective
units produced on the day shift and the afternoon shift for a
sample of four days last month.
Day
1
2
3
4
Day shift
11
12
13
19
Afternoon
shift
9
10
14
15
At the 0.025 significance level, can we conclude there are more
defects produced on the day shift? Hint: For the...

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