1. Differentiate between a judgment sample and a convenience sample.
2. In what way are the quota sample and the stratified sample similar? In what way are they different? What effect does this difference have on the applications for which such samples might be appropriate?
3. What is the difference between a probability sample and a nonprobability sample? Which type is necessary if we wish to statistically generalize from the sample to the population?
4. For each of the following situations, would you rec- ommend a sample or a census? Explain your reasoning in each case.
a. A purchasing agent has just received a shipment of shock-resistant watches and wants to find out approximately how far they can be dropped onto a concrete surface without breaking the crystal.
b. General Mills wants to learn the age, gender, and income characteristics of persons who consume Cheerios breakfast cereal.
c. The producers of NBC's Tonight Show want to find out what percentage of TV viewers recognize a photo of host Jay Leno.
d. A small company wants to determine whether U.S. companies that manufacture nuclear submarines might be interested in a new technique for purifying air when such craft are submerged.