Ordered sampling versus unordered sampling.

Refer to Exercise 4.91. Suppose the sampling of 3 alternators is done by randomly choosing one after another and without replacement.

The event A can then be described as G1G2G3 , where G denotes “good” and the suffixes refer to the order of the draws. Use the method of Example 14 to calculate P(A) and P(B).Verify that you get the same results as in Exercise 4.91.

This illustrates the following fact: To arrive at a random sample, we may randomly draw one object at a time without replacement and then disregard the order of the draws.