Sample Size calculator Formula:
ss = Z2 × P × (1 - P) / C2
Where:
Z: Z value (1.96 for 95% confidence level, 2.58 for 99%)
P: Choice percentage ( 0 - 100 )
C: Confidence Interval ( 0 - 100 )
If population is small, the sample size need adjustment as follows, otherwise, just leave the population field empty:
ss = ss / ( 1 + (ss - 1)/population)
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