How do we know that the opinions of people who call in to radio talk shows are not typical of most ...

How do we know that the opinions of people who call in to radio talk shows are not typical of most Americans?
 
  a. As a sample, they are unrepresentative of the whole population.
  b. As a sample, they are perfectly random.
  c. As a sample, they lack intensity.
  d. As a sample, their opinions are ill formed.

Question -2-

Since the 1950s presidential and congressional efforts to address questions about immigration have generally been __________.
 
  a. passionately nativist
  b. inconsistent and haphazard
  c. focused on reducing Asian immigration
  d. proactive and optimistic

Question -3-

If you agree that public opinion plays a crucial role in democratic government, what also must you believe for your views to be considered consistent?
 
  a. that public opinion is a threat to the needs of the majority
  b. that public opinion is a threat to core political beliefs
  c. that public ignorance is a threat to core political beliefs
  d. that people in government must hear the voices of citizens

Question -4-

Prior to the recent surge in immigration, Figure 4.1 shows that the largest wave of new immigrants came to the United States in the years between __________.
 
  a. 1840 and 1860
  b. 1864 and 1875
  c. 1891 and 1900
  d. 1950 and 1984