Maurice Tutor

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Category > Management Posted 05 Feb 2018 My Price 7.00

Farmer’s Dairy

At Farmer’s Dairy, a machine is set to fill 32-ounce milk cartons. However, this machine does not put exactly 32 ounces of milk into each carton; the amount varies slightly from carton to carton but has a normal distribution. It is known that when the machine is working properly, the mean net weight of these cartons is 32 ounces. The standard deviation of the milk in all such cartons is always equal to .15 ounce. The quality control inspector at this company takes a sample of 25 such cartons every week, calculates the mean net weight of these cartons, and tests the null hypothesis, μ = 32 ounces, against the alternative hypothesis, μ ≠ 32 ounces. If the null hypothesis is rejected, the machine is stopped and adjusted. A recent sample of 25 such cartons produced a mean net weight of 31.93 ounces.

a. Calculate the p-value for this test of hypothesis. Based on this p-value, will the quality control inspector decide to stop the machine and readjust it if she chooses the maximum probability of a Type I error to be .01? What if the maximum probability of a Type I error is .05?

b. Test the hypothesis of part a using the critical-value approach and α =.01. Does the machine need to be adjusted? What if α = .05?

 

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Maurice Tutor
(5)
Status NEW Posted 05 Feb 2018 10:02 PM My Price 7.00

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