Please explain your answer. (Circle the correct response) The distribution used

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Please explain your answer.

(Circle the correct response) The distribution used when testing a statement regarding a single population variance is the a. Standard Normal distribution b. t -distribution c. F distribution d. x2 distribution (Circle the correct response) The distribution used when testing a statement regarding the ratio of two population variances is the a. Standard Normal distribution b.t -distribution c. F distribution d. x2 distribution .An automotive part must be machined to close tolerances to be acceptable to a car manufacturer. Production specifications call for a maximum variance of 0.0004 in the length of this part. A random sample of 30 parts yields a variance of 0.0005. At 95% confidence, are the production variance specifications being violated? Ho: Ha: = Test Statistic: Rejection decision and reasoning: Conclusion

Explanation / Answer

(1) Ans : Option d ( chi square distribution )

(2) Ans : Option c ( F distribution )   

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