Appendix A.29

Proportion CI Calculator

Construct confidence intervals for population proportions and determine required sample sizes.

Successes (x)

Sample Size (n)

Confidence Level

Conditions Met

≥ 10 ✓

:0.4200

:1.96

Margin of Error (E):0.0967

95.0% Confidence Interval

(0.3233, 0.5167)

Interpretation: We are 95.0% confident that the true population proportion is between 0.3233 and 0.5167.