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:
2 In the previous question the variance of the sample mean is.
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:
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 ±_____ gizmos from the population means.
5 In the population of employees in your company, 35 percent contribute to the annual United Way campaign. You plan to take a sample of size n = 200 and calculate the sample proportion who contribute to United Way.
The expected value of the sample proportion is:
6 In the previous question, the standard error of the sample proportion is:
a 0.036 (3.6 percentage points.)
b 0.042 (4.2 percentage points.)
c 0.048 (4.8 percentage points.)
d 0.055 (5.5 percentage points.)
8 There is a population of 10 families in a small neighborhood. You plan to take a random sample of 4 families (without replacement). How many samples of size n = 4 are possible.
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