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What is the standard error of the proportion if 80% of the 1,200 respondents in a yes/no survey answered "no"?

What is the standard error of the proportion if 80% of the 1,200 respondents in a yes/no survey answered "no"?
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What is the standard error of the proportion if 80% of the 1,200 respondents in a yes/no survey answered "no"?

User Bakua
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standard error for a sample proportion, p = 0.8, n = 1200


SE= \sqrt{ (p(1-p))/(1200) } = \sqrt{ (0.8(1-0.8))/(1200) } \approx 0.015 * 100\%=1.15\%
User Sandiejat
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