Confidence interval for proportions
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In a city of 50,000, you conducted 1,000 interviews on a random sample basis to find out how many respondents wore sneakers. Of the 1,000 interviewed, 300 wore sneakers. With a 95% confidence, how precise is your estimate?
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The expert calculates confidence interval for proportions.
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We are being asked to find the confidence interval of our estimate
proportion who wore sneakers = 0.3 or 30% =300/1000
95% Confidence limits for proportions=
p= 30%
q=1-p= 70%
n=sample size= 1000
sp=standard ...
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