# Ch9Spreadsheets - What is the percentage who say yes in the...

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Confidence Intervals for Yes/No Questions When you have a random sample from a population and you ask yes/no questions then you can calculate a confidence interval around the percentage of the sample who say yes (e.g., yes they were very satisfied, no they were less than very satisfied) where you c be 95% confident that the true percentage of the population is within the confidence limit range.

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Unformatted text preview: What is the percentage who say yes in the sample 50.00% What is the sample size? 400 Lower limit Upper lim You can be 95% confident that true population percentage is betwe 45.00% and 55.00% Precision (confidence interval) 10.00% You can be 99% confident that true population percentage is betwe 42.50% and 57.50% Precision (confidence interval) 15.00% s can it...
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