The large sample confidence interval procedure for estimating $p _ { 1 } - p _ { 2 }$ using $z$ can safely be used if the combined samples have at least 20 "successes" and 20 "failures."

Question

Quizplus · Accepted Answer

The large sample confidence interval procedure for estimating $p _ { 1 } - p _ { 2 }$ using $z$ requires at least 10 successes and 10 failures in each sample, not combined.

The Large Sample Confidence Interval Procedure for Estimating p1−p2p _ { 1 } - p _ { 2 }p1​−p2​

The Large Sample Confidence Interval Procedure for Estimating $p _ { 1 } - p _ { 2 }$