1 find the expected value and variance for the blood-type, Basic Statistics

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1 find the expected value and variance for the blood-type

1. Find the expected value and variance for the blood-type example.

a. Using the formulas given in Section 2.4

b. Using the special formulas for the expected value and variance of a binomial distribution that are given in this section

2. An experimental psychologist has 20 volunteers for a sensory perception experiment and wishes to draw a random sample of 10 of these volunteers. Suppose that he decides to write all combinations of 10 names on index cards and then draw 1 of the cards at random. How many combinations will there be?

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Basic Statistics: 1 find the expected value and variance for the blood-type

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