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14 cards from this deck
Large group being studied in research
Smaller group studied to represent population
Around 1000 people
p^\hat{p}p^, fraction in sample with characteristic
ppp, true fraction in population with characteristic
E=1nE = \frac{1}{\sqrt{n}}E=n1
How much sample result might differ from true population value
Margin of error decreases
p^±1n\hat{p} \pm \frac{1}{\sqrt{n}}p^±n1
Method works correctly 95% of the time
p^−E\hat{p} - Ep^−E or p^−1n\hat{p} - \frac{1}{\sqrt{n}}p^−n1
p^+E\hat{p} + Ep^+E or p^+1n\hat{p} + \frac{1}{\sqrt{n}}p^+n1
n=(1E)2n = (\frac{1}{E})^2n=(E1)2 or n=1E2n = \frac{1}{E^2}n=E21
Quadruple (multiply by 4)
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