A telephone survey of 2000 Canadians conducted March 20-30, 2001, found that "Overall, about half of Canadians in the poll say the right number of immigrants are coming into the country and that immigration has a positive effect on Canadian communities. Only 16 percent view it as a negative impact while one third said it had no impact at all" (The Ottawa Citizen, August 17, 2001, p. A6.).
a. What is the population for this survey?
b. How many people were in the sample used for this survey?
c. What is the approximate margin of error for this survey?
d. Provide an interval of numbers that is 95% certain to cover the true percentage of Canadians who view immigration as having a negative impact.