For a given poll, a professional polling firm states that it has "95 percent confidence that the maximum margin of sampling error is plus or minus four percentage points." What is the firm trying to say by claiming "95 percent confidence"?
A) There is a 95 percent chance that the poll is off by four points or more.
B) There is a 5 percent chance that the poll is off by four points or more.
C) There is a 95 percent chance that the poll is off by five points or more.
D) There is a 4 percent chance that the poll is off by five points or more.
E) There is a 5 percent chance that the poll is off by ninety-five points or more.
B
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One key feature of random samples:
A) must make substitutions whenever necessary. B) must use a selection process based on the researcher's preference. C) must identify and pick a particular sampling element, rarely using substitutions. D) must select the exact elements in the sample.
Which of the following describes the process of selecting delegates to the national conventions?
A) a majority of the delegates are selected by the party leadership in caucus B) a majority of the delegates are selected by presidential primaries C) a majority of the delegates are selected by rank-and-file members utilizing caucuses D) a majority of the delegates are selected by old-style, big-city political bosses E) a majority of the delegates purchase their position
In a survey of Americans, political scientist George Bishop asked respondents about their opinions on “the Public Act Affairs Act of 1975.” What problem did his study reveal?
a. Respondents tend to self-select. b. Many respondents lack sufficient subject knowledge. c. Survey wording can influence the results of a survey. d. Question framing can impact the results of a survey.
In the majority of states that have abolished the grand jury system, ____ is/are used to determine whether there is probable cause for the accused to be bound over for trial.
a. a preliminary hearing b. a bill of attainder c. a plea bargain d. the rules of discovery