10.Why is a sample often a better way to obtain information about a population than a census?_______

A. A census is too time consuming

B. A census is frequently impractical

C. A census is more costly than taking a sample

D. All of the above

E. None of the above

11(a) Count the number of ways to select a sample of 3 people to serve on a board of directors from a population of 6 people.

answer: ____________

(b) If a simple random sampling procedure is to be em- ployed, the chances that any particular sample will be the one selected are _____________

12.Calculate the mode, mean, and median of the following data:

10,12,6,8,999,15,12,12

Mode = ______

Mean = ______

Median = _______

Which measure of center does not work well here?_______

A. Median

B. Mode

C. Mean

D. All of the above