Chapter 4 · Sampling · Slide 140/274
Margin of error approach: two formulas
Calculating the margin of error
4.4 · Sample Size
Calculating the margin of error
Margin of error approach: two formulas
x = true value of the parameter
x̂ = sample value
E = margin of error
For metric data
Means
Assessing means computed from the sample
zz-value for the specified confidence level
σStandard deviation of the parameter in the population
nSample size
For proportions
Proportions
Assessing computed proportions
zz-value for the specified confidence level
πEstimated value for the proportion in the population
nSample size
QUESTIONSTAR · Dr. Paul Marx
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