What does it mean when a part of the population is under-represented?
choose the correct answer below.
a. a part of the population is under-represented when it is proportionally smaller in a sample than in its population.
b. a part of the population is under-represented when it is proportionally smaller in its population than in a sample.
c. a part of the population is under-represented when individuals selected to be in the sample who do not respond to the survey have different opinions from those who do.
d. a part of the population is under-represented when their answers on a survey tend not to reflect their true feelings.