A pollster wants to describe all adults in a state but interviews 900 selected adults. What is the term for all adults in the state?

A national survey interviews voters chosen so every voter in the target list had a known chance to be selected. What kind of sample is this?

Before calling respondents, a researcher builds a list of phone numbers from which names will be drawn. In polling vocabulary, what is that list?

After interviews, a pollster adjusts responses so age, race, education, and sex match reliable population benchmarks. What is this adjustment called?

A radio host asks listeners to call if they oppose a new tax, then reports that almost all callers oppose it. What is the central defect?

A survey asks, 'Do you oppose the mayor's wasteful tax hike that will hurt families?' What is the main problem with the poll?

A poll about all city adults uses only numbers from a college alumni directory. What defect most directly threatens the result?

A poll contacts randomly selected voters, but almost no young voters respond and the pollster makes no callbacks or weighting adjustments. What problem is most likely?

A group compares last year's phone poll with this year's online poll using the same question and claims opinion changed. What weakness should a careful reader notice?

Use the bar graph. Which news source has the highest reported trust?

Use the bar graph. By how many percentage points does the oldest age group's approval exceed the youngest group's approval?

Use the line graph. What best describes support over the full period shown?

Use the chart. What share of respondents identified as Independents?

Use the bar graph. What is the gap between postgraduates and adults with high school or less?

Use the line graph. Between which two weeks did favorability fall the most?

A poll reports Candidate A at 51% and Candidate B at 44%, with a margin of error of plus or minus 3 points. What is the best interpretation?

A poll shows Candidate A at 48% and Candidate B at 46%, with a margin of error of plus or minus 4 points. What may be concluded from this poll alone?

A poll says 52% favor a proposal and 48% oppose it, with a margin of error of plus or minus 3 points. Can the poll alone prove a majority favors it?

Interviewers stand outside polling places and ask people leaving how they just voted. What kind of survey is this?

A news organization runs the same election survey each night and reports a rolling average showing changes in support over time. What kind of poll is this?