An industrial supplier has shipped a truckload of teflon lubricant cartridges to

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 cartridges is in excess of the 12 ounces printed on each cartridge. To check this claim, a sample of n= 15 cartridges are randomly selected from the shipment and carefully weighed Summary statistics for he sample are: x = 12.13 ounces. s 30 ounce. To determine whether the suppliers claim s tr e consider the est Ho ? 12 vs-p> 12 where is the true mean weight of the cartridges Find the rejection region for the test using-001 OA. z>2.33 O B. IZl> 2.58 O C. t> 2.977, where t depends on 14 df D. t>2.624, where t depends on 14 df

Explanation / Answer

n = 15

DF = 15 - 1 = 14

With 14 df and alpha = 0.01, the critical value is t0.99, 14 = 2.624

So the rejection is if t > 2.624

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