For data analysts, researchers and ML teams planning surveys, labelling jobs or evaluation sets. You get the required sample size, the unadjusted size for an infinite population and the z-score used.
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You enter
95 percent confidence, 5 percent margin of error, population 100,000, distribution 50
The tool shows
Required sample 383; unadjusted (infinite population) 385; z-score 1.96
For a large population about 385, using z = 1.96 and a 50 percent distribution. With a finite population of 100,000 it drops slightly to 383.
p times 1 minus p is largest at 0.5, so 50 percent gives the most conservative, largest sample size when you do not know the true proportion.
The tool applies the finite population correction. For large populations the result barely changes, but for small ones the required sample falls noticeably.
Yes. It is free, needs no sign-up and runs entirely in your browser, so what you type is not uploaded. You only sign in if you want to email a result to yourself or save it to your CareerByteCode profile.
