A 30-minute consumer survey mailed to 500 adults aged 25–34 included a $10 gift certificate to Borders. The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 185...

A 30-minute consumer survey mailed to 500 adults aged 25–34 included a $10 gift certificate to Borders. The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 185 responses from the first group and 45 from the second group. (a) At α = .025, did the gift certificate increase the response rate by at least 20 percent? (b) Find the p-value.