In a poll of 1641 people carried out in Canada in November 2005, 73% of people surveyed agreed with the statement that “you don’t really expect that politicians will keep their election promises once they are in power” (CBC News 2005).

a. What is the parameter being estimated?

b. What is the value of the sample estimate?

c. What is the sample size?

d. The poll also reported that “the results are considered accurate within 2.5 percentage points, 19 times out of 20.” Explain what this statement likely refers to.