For the following statements and arguments, choose which one of the following statements best describe the evidence:
-A Gallup poll of 1800 randomly selected Americans predicted that if Oprah Winfrey became a candidate, she would win the presidential election by a significant number of percentage points. (from a city newspaper)
Conclusion: If Oprah Winfrey became a candidate, she would win the presidential election by a significant number of percentage points.
A) The sample is not sufficient in size or is not given.
B) The sample is not random.
C) The sample is not representative (or is lacking in breadth).
D) The sample is sufficient, random, and representative.

Question

Quizplus · Accepted Answer

1800 is a sufficient number for such a poll, the Americans were randomly selected and are representative (given Gallup's policy of only polling voting Americans) of the general populace. However, if a student questions whether all of those surveyed were eligible to vote or if they would actually vote, and believes that the poll may not be representative, he or she should be rewarded for careful thinking.

For the Following Statements and Arguments, Choose Which One of the Following