The ________ is drawn from selected subgroups of a target population.
a. questionnaire
b. neutral question
c. stratified random sample
d. random sample
Question 2
The reason that China has about 30 million fewer females than males under the age of 20 is
a. male infanticide.
b. girls are often not counted in official statistics.
c. raising a boy is like watering someone else's plant.
d. female infanticide.