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Section I: Multiple Choice Select the best answer for each question. The Gallup Poll
Chapter 8, Problem T8.1(choose chapter or problem)
The Gallup Poll interviews 1600 people. Of these, 18% say that they jog regularly. The news report adds: The poll had a margin of error of plus or minus three percentage points at a 95% confidence level. You can safely conclude that
(a) 95% of all Gallup Poll samples like this one give answers within 3% of the true population value.
(b) the percent of the population who jog is certain to be between 15% and 21%.
(c) 95% of the population jog between 15% and 21% of the time.
(d) we can be 95% confident that the sample proportion is captured by the confidence interval.
(e) if Gallup took many samples, 95% of them would find that 18% of the people in the sample jog.
Questions & Answers
QUESTION:
The Gallup Poll interviews 1600 people. Of these, 18% say that they jog regularly. The news report adds: The poll had a margin of error of plus or minus three percentage points at a 95% confidence level. You can safely conclude that
(a) 95% of all Gallup Poll samples like this one give answers within 3% of the true population value.
(b) the percent of the population who jog is certain to be between 15% and 21%.
(c) 95% of the population jog between 15% and 21% of the time.
(d) we can be 95% confident that the sample proportion is captured by the confidence interval.
(e) if Gallup took many samples, 95% of them would find that 18% of the people in the sample jog.
ANSWER:Step 1 of 2
Given that,
The Gallup Poll interviews 1600 people. Of these, 18% say that they jog regularly. The news report adds: The poll had a margin of error of plus or minus three percentage points at a 95% confidence level.