formula for determining sample size from a given population
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Known population size N = 5708
Assuming that you use 95% confidence interval, the error level is 0.05. The minimum sample size is calculated by using the Yamane method:
nYamane = N / (1 + Ne2)
The calculation follows:
= 5708 / (1 + 5708(0.0025)
= 5708 / 1 +14.25
= 5708 / 15.25
= 374.30
The required sample size is about 374
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