Sample Size -- Confidence Interval For a Proportion

Instructions: Enter parameters in the Red cells. Answer will appear in the blue cell.

  • P = Expected Proportion
  • W = Total Width of Confidence Interval
Confidence Level
(e.g., 0.95)		PW

Z-Alpha
0.00
N0

Software utilities by Michael Kohn (makohn@mkanders.com) and Mike Jarrett (mike.jarrett@quesgen.com)

Disclaimer: Software is provided on an as-is basis and no warranty is made of any kind. Calculations are believed accurate but should be verified by the user