Question

The mean replacement time for a random sample of 15 washing machine is 10.7 years and the standard deviation is 2.5 years. Construct 99% confidence interval for the standard deviation of the replacement of all washing machines of this type. What would be the value if the standard deviation is 2.7 years.

Answer #1

n = 15

s^{2} = 6.25

The critical values for α=0.01 and df = 14 are

Part b)

If the SD is 2.7, s^{2} = 7.29

The mean replacement time for a random sample of 15 washing
machine is 10.7 years and the standard deviation is 2.5 years.
Construct 99% confidence interval for the standard deviation of the
replacement of all washing machines of this type. What would be the
value if the standard deviation is 2.7 years.

The mean replacement time for a random sample of 15 washing
machine is 10.7 years and the standard deviation is 2.5 years.
Construct 98% confidence interval for the standard deviation of the
replacement of all washing machines of this type. What would be the
value if the standard deviation is 2.7 years.

The mean replacement time for a random sample of 20 washing
machines is 10.9 years andthe standard deviation is 2.7 years.a)
Which distribution is used to estimate standard deviation?b) Find
the critical right value:c) Find the critical left value:d) How
many degrees of freedom are in this sample?e) Construct a 99%
confidence interval for the standard deviation, Η, of the
replacementtimes of all washing machines of this type.f) State your
results in non-technicaal language.

A
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Construct a 95 percent confidence interval for the true mean
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yearsConstruct a 99 % confidence interval for the standard
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The mean and standard deviation for the charge time of a random
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Select one: a. 23 +/- 0.77 b. 23 +/- 1.40 c. 23 +/- 1.29 d. 23 +/-
1.25 e. 23 +/- 0.91

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