Unformatted text preview: darderror !1 − !2 − (!1 − !2 )
!1 1 − !1
! 1 − !2
+ 2
!1
!2 What is the Z
score for the difference of 0? F What is the probability that for two random samples, one from each year, that the difference in sample proportions, !! − !! , would be less than 0? © 2011 THE CARNEGIE FOUNDATION FOR THE ADVANCEMENT OF TEACHING A PATHWAY THROUGH STATISTICS, VERSION 1.6, STATWAY™
STUDENT HANDOUT STATWAY STUDENT HANDOUT  5 Lesson 9.1.2 Using Technology to Explore the Sampling Distribution of the Differences in Two Proportions G What might we do to make it more likely that a randomly selected difference in sample proportions is closer to the difference in population proportions? 3 Suppose we increase the sample size to 200 for year 1 and 250 for year two. A Will the change in sample sizes affect the mean of the sampling distribution of the differences in sample proportions? What is the mean of the sampling distribution? B Are the conditions for normality still satisfied?...
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This document was uploaded on 03/13/2014 for the course MATH 75 at Skyline College.
 Spring '14

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