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sample size calculation method – statswork

SAMPLE SIZE CALCULATION

 

Sample size: Infinite Population (Where the population is greater than 50,000)

SS= Sample Size
Z=Z-value (1.96 for a 95 percent confidence level)
P=Percentage of population picking a choice
C=Confidence interval (Margin error=0.05)



SS=384

Sample Size – Finite Population (Where the population is less than 50,000)

Pop=Population =3175
Note:Calculate the sample size using the infinite population formula first. Then use the sample size derived from that calculation to calculate a sample size for a finite population
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New SS= 384/1.120629921259843
New SS=342.66
New SS=343