Refer to the previous exercise. The same week that the Field Poll was released a Web site called SFGate.com (www.sfgate.com/polls/) (www.sfgate.com/polls/) asked visitors to “Click to vote” on their preferred response to “Agree with new law allowing drivers’ licenses for illegal immigrants?” The choices and the percent who chose them were “Yes, gesture of respect, makes roads safe” 19%, “No, thwarts immigration law, poses security risk” 79%, and “Oh, great, another messy ballot battle” 2%. The total number of votes shown was 2900.
a. What type of sample was used for this poll?
b. Explain likely reasons why the percent who supported the law in this poll (19%) differed so much from the percent who supported it in the Field Poll ( 34%).