a. On election day, a pollster for Fox News positions herself outside a polling place near her home. She then asks the first 50 voters leaving the facility to complete a survey. b. An Internet service...

a. On election day, a pollster for Fox News positions herself outside a polling place near her home. She then asks the first 50 voters leaving the facility to complete a survey.

b. An Internet service provider randomly selects 15 residential blocks from a large city. It then surveys every household in these 15 blocks to determine the number that would use a high-speed Internet service if it were made available.

c. Thirty-five sophomores, 22 juniors, and 35 seniors are randomly selected to participate in a study from 574 sophomores, 462 juniors, and 532 seniors at a certain high school.

d. Officers for the Department of Motor Vehicles pull aside every 40th tractor trailer passing through a weigh station, starting with the 12th, for an emissions test.