(p. 317). Recall that 70% of Canadians pay their credit card balance in full each month from a sample of 300.

a. Construct a 99% confidence interval for the true proportion of all Canadians who pay their credit card balance in full each month.

b. Suppose a banker claims that 65% of all Canadians pay their credit card balance in full each month. Is this true? Explain.

c. According to the Canadian Bankers Association, about 70% of the sampled Canadians’ credit card records were selected from a bank and about 30% were high earners. How might this information impact the inference you made in part b?