In: Math
A machine produces pipes used in airplanes. The average length of the pipe is 16 inches. The acceptable variance for the length is 0.3 inches. A sample of 17 pipes was taken. The average length in the sample was 15.95 inches with a variance of 0.4 inches.
a. |
Construct a 95% confidence interval for the population variance. |
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 of significance. State the decision rule for the test using the critical value approach. |
e. |
What do you conclude about the population variance? |