ci_twosample_pro(x1, n1, x2, n2, cl)

Computes a confidence interval for the difference of two proportions. x1 and x2 are frequencies, n1 and n2 are sample sizes, cl is the confidence level.
Assumes samples are independent and parameters x1, x2, n1 and n2 are bigger or equal than 5.

See also ci_twosample_std ci_twosample_tpaired ci_twosample_tpooled 

Example

(See NOTE below)

ci_twosample_pro(276, 747, 195, 434, .90)

Z-Test for Two Population Proportions.

Confidence interval for the difference of two proportions.

Confidence level : 0.9 (90%)

Results:

Interval  : (-0.12868001195435283, -0.030981676273211835 )

Margin of error : 0.048849167840570494

NOTE: The data used in this example was taken from the textbook Introductory Statistics 6th Ed. by Neil A. Weiss with kind permission of Addison Wesly Longman, Inc. (AWL). AWL does not endorse nor it supports the Calcugator.