Consider the following population: {1, 2, 3, 4}. Note that the population mean is

a. Suppose that a random sample of size 2 is to be selected without replacement from this population. There are 12 possible samples (provided that the order in which observations are selected is taken into account):

Compute the sample mean for each of the 12 possible samples. Use this information to construct the sampling distribution of x. (Display the sampling distribution as a density histogram.)
b. Suppose that a random sample of size 2 is to be selected, but this time sampling will be done with replacement. Using a method similar to that of Part (a), construct the sampling distribution of x.
c. In what ways are the two sampling distributions of Parts (a) and (b) similar? In what ways are they different?

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1+2+3+4 μ= 2.5 = 1,2 , 3 1,4 2 2,3 2,4 3, 1 3, 2 3,4 4, 4, 2 4,3