Question

Before agreeing to purchase a large order of polyethylene sheaths for a particular type of high-pressure oil-filled submarine power cable, a company wants to see conclusive evidence that the true standard deviation of sheath thickness is less than 0.04 mm. What hypotheses should be tested, and why?

The appropriate hypotheses are

H₀: σ ?<>≠= 0.04 mm

versus

H_a: σ ?<>≠= 0.04 mm.

With this formulation, the burden of proof is on the data to show that the requirement ---Select---hashas not been met.

In this context, what are the type I and type II errors?

In this context, the type I error occurs if we ---Select---acceptreject a shipment that should have been ---Select---acceptedrejected . A type II error occurs if we ---Select---acceptreject a shipment that should have been ---Select---acceptedrejected .

Answer 1