Question

An industrial supplier has shipped a truckload of Teflon lubricant cartridges to an aerospace customer. The customer has been assured that the mean weight of these is “in excess” of the 12 ounces printed on each cartridge. To check this claim, a sample of n = 20 cartridges are randomly selected from the shipment and carefully weighed. Summary statistics for the sample are:

Sample mean = 12.11 Sample standard dev = .30 ounce To determine whether the supplier’s claim is true, consider the test

Ho: u = 12 vs. Ha: u >12, where u is the true mean weight of the cartridges

A)

Find the critical value for this test. (No significance level provided in problem)

	A.	4.67
	B.	1.729
	C.	-1.64
	D.	1.725
	E.	0

B)

Calculate the p-value for this test.

	A.	.05<P<.10
	B.	.0505
	C.	.10<P<.20
	D.	The correct answer is not among the choices.
	E.	.1010

Answer 1