question archive An automotive part must be machined to close tolerances to be acceptable to customers
An automotive part must be machined to close tolerances to be acceptable to customers
Subject:MathPrice: Bought3
An automotive part must be machined to close tolerances to be acceptable
to customers. Production specifications call for a maximum variance in the lengths of the parts of 0.0004. Suppose a random sample of 30 parts gives a variance of s2 = 0.00024. You wish to test H0: σ 2 ≥ 0.0004 vs Ha: σ 2 < 0.0004 at the 5% level of significance. Which of the following is the correct decision and conclusion? (You can assume that part lengths follow a normal distribution)
A)Do not reject H0; The parts are not meeting the company standard
B) Do not reject H0; The parts are meeting the company standard
C) Reject H0; The parts are meeting the company standard
D) Reject H0; The parts are not meeting the company standard
