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1.  Why might one choose to conduct an observational study instead of an experiment?

a.  It provides more complete results.

b.  Conducting an experiment may not be ethical.

c.  It is easier to control conditions in an observational study.

Say you wish to select a sample of 100 people from a population of 600 people. You number the people in the population 1 through 600. Then you role a fair die. If the die comes up 1, you select the people numbered 1 through 100. If the die comes up 2, you select the people numbered 101 through 200, and so on if the die comes up 3, 4, 5 or 6.

2.  Does every person in the population have an equal chance of being in the sample?

a.  Yes.

b.  No.

3.  Does this methodology result in a simple random sample?

a.  Yes.

b.  No.

4.  If you want to take a poll of students at liberal arts colleges, and you choose 6 colleges at random and send someone to conduct a poll at these locations, what kind of sampling are you doing?

a.  Simple Random

b.  Stratified

c.  Systematic

d.  Cluster

e.  Convenience