7 Consider the population of four families with the followin

7

Consider the population of four families with the following data representing the number of television sets each family owns.

You plan to take a sample of size 3. How many possible samples of size 3 are there?

a)

6

b)

15

c)

18

d)

20*

8

What is the E(x) in this problem?

a)

2.00

b)

2.25

c)

2.50*

d)

2.75

e)

3.00

Solution

7.

There are 6 families here.

Thus, there are 6C3 = 20 samples. [ANSWER]

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8.

E(x) = mean number of Tv\'s = (4+3+3+1+2+2)/6 = 15/6 = 2.5 [ANSWER, C]