A machine produces pipes used in
airplanes. The average length of the pipe is 16 inches....
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A machine produces pipes used inairplanes. The average length of the pipe is 16 inches. Theacceptable variance for the length is 0.3 inches. A sample of17 pipes was taken. The average length in thesample was 15.95 inches with a variance of 0.4 inches.
a.
Construct a 95% confidence interval for the populationvariance.
b.
State the null and alternative hypotheses to be tested.
c.
Compute the test statistic.
d.
The null hypothesis is to be tested at the 5% level ofsignificance. State the decision rule for the test using thecritical value approach.
e.
What do you conclude about the population variance?
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