A Quinnipiac University poll conducted during the week of 2-2-2013 surveyed 1,230 registered voters nationwide and asked, "Do you support or oppose stricter gun laws in the United States?" 52% of respondents supported stricter gun laws. This poll had a margin of error of 3.3%. What is the confidence level that goes along with this poll (to 2 decimals)?
The answer is not 98%, 98.98%, 99%, 99.01%
given data are:-
sample size (n) = 1230
p = 0.52
margin of error (E) = 3.3% = 0.033
according to the problem,
[ z^{*} is the critical value for significance level alpha, both tailed test]
[ as this is the critical value at level of significance, both tailed test]
[ in any blank cell of excel type =NORMSDIST(2.316563) press enter]
so, we have,
level of significance () = 0.0205 = 2.05%
confidence level = (1-) = (1-0.0205) = 0.9795 = 97.95 %
the confidence level that goes along with this poll is 97.95 %
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A Quinnipiac University poll conducted during the week of 2-2-2013 surveyed 1,230 registered voters nationwide and...
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