An industrial supplier has shipped a truckload of talon lubricant to an aerospac

Question

An industrial supplier has shipped a truckload of talon lubricant to an aerospace customer. The customer has been assured that the mean weight of these cartridges is in excess of the 11 ounces printed on each cartridge. To check this claim, a sample of n = 35 cartridge are randomly selected from the shipment and carefully weighted. Summary for the sample are x = 11.13 ounces, s = 25 ounces. To determine whether the supplier's claim is supported, find the rejection region for the test using a = 01 A. z = 2.575 B. z = -2.575 or z = 2.575 C. z = 2.33 D. None of the above.

Explanation / Answer

n = 35

since the claim is to check if the weight is more than 11 ounce

,hence it id one-directional is +ve direction )

Z -critical = P(Z > z*) = 0.01

z* = 2.327

and critcal region is z > 2.33

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