Chapter 4 · Sampling · Slide 143/274
z-Values and Maximum Margin of Error
With z = 1.96 and the maximum π = 0.5 the formula simplifies to:
4.4 · Sample Size
Margin of Error Approach
z-Values and Maximum Margin of Error
z-Values
1.96
for 95 % confidence level
2.58
for 99 % confidence level
Maximum Margin of Error for 95% Confidence Level
With z = 1.96 and the maximum π = 0.5 the formula simplifies to:
… the upper bound of the error — independent of the actual proportion π.
QUESTIONSTAR · Dr. Paul Marx
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