Suppose you try to conduct a presidential approval poll of 5,000 likely U. S. voters. You know that 25% of the voters are registered as
Republican, 31% are registered as Democrat, and 42% are registered
as Independent. If you are going to construct a representative sample
of this population, approximately how many of the likely voters in the
sample should be:
a. Republican
b. Democrat
c. Independent
d. Notice the sum of the percents is not 100. What could account for
this?