In May 2010, Public Safety Minister Vic Toews introduced a bill in Parliament proposing that sex offenders who have abused children should not be able to get a government pardon. Angus Reid conducted a survey of 1013 Canadian adults and found that 81% supported the bill.

a) How sure can we be that the percentage of Canadian adults supporting the bill was in fact more than 80%?

b) The survey found that 76% of Liberal Party voters supported the bill. How sure can we be that the percentage of Liberal voters supporting the bill is in fact less than 80%? Assume that 40% of the survey respondents were Liberal voters.