A researcher selects his sample in this way. He paints numbers on 100 ping-pong balls, and he paints half of them blue and half of them green. He puts the blue half onto a large tray, and the green half of them onto another large tray
Then he mixes each group and trains his dog to bring 10 balls from each tray to him, gently and systematically, one at a time. What type of sample is this?
a. Snowball
b. Random
c. Stratified random
d. Systematic
ANS: C
Stratified random sampling is used when the researcher knows some of the variables in the population that are critical to achieving representativeness. Variables commonly used for stratification are age, gender, ethnicity, socioeconomic status, diagnosis, geographical region, type of institution, type of care, care provider, and site of care. The dog has no agenda, and the balls are mixed. The dog chooses 10 balls from each stratum. The sample is stratified random.
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