We construct a 90% confidence interval for P, the population proportion of freshmen able to pass a proposed English placement exam. The sample interval runs from .43 to .49. This tells us that
A) there is a 90% probability that P falls between .43 and .49
B) there is a 90% probability that an interval so constructed will include P
C) 90% of the time P will fall between .43 and .49
D) 90% of intervals so constructed will fall between .43 and .49

Question

Quizplus · Accepted Answer

A 90% confidence interval means that if we were to take many samples and construct intervals in the same way, 90% of those intervals would contain the true population proportion P.

We Construct a 90% Confidence Interval for P, the Population