1 You run a gizmo factory. Over the past year the average output of the factory

Question

1 You run a gizmo factory. Over the past year the average output of the factory is 480 gizmos and the standard deviation of that output is 10 units per day. In repeated random samples of size n = 40 days, the expected value of sample mean is:

a 12







b 480







c 76







d 48

















2 In the previous question the variance of the sample mean is.


a 10







b 2.5







c 15.8







d 1.58

















3 Using the population mean and standard deviation in question 1, what is the probability that the mean of a random sample of n = 40 days exceeds 482 gizmos:
a 0.1020







b 0.0571







c 0.0384







d 0.0287

















4 Using the population mean and standard deviation in question 1, in repeated samples of size n = 40, 95% of sample means fall within that fall within

Explanation / Answer

5 is .35

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