Question

Citizen registration and voting varies by age and gender. The following data is based on registration and voting results from the Current Population Survey following the 2012 election. A survey was conducted of adults eligible to vote. The respondents were asked in they registered to vote. The data below are based on a total sample of 760. We will focus on the proportion who voted for males and for females. There is no expectation that one group is more likely to vote.

Gender	Voted	Not Voted	Total
Males	217	147	364
Females	252	144	396
Total	399	361	760

If we construct a 95% Confidence Interval for the difference in the proportion voting for males and females, the interval will contain zero. 

• True 

• False

Answer 1

The statistical software output for this problem is:

Two sample proportion summary confidence interval: P1: proportion of successes for population 1 P2: proportion of successes for population 2 P1-P2: Difference in proportions 95% confidence interval results: Difference Count1 Total1 Count2 Toal2 Sample Diff. Std. ErrL. LimitU. Limit 217 364 252 396 -0.04020979 0.035295456 0.10938761 0.028968033 P1 P2

Hence,

The answer is True. The interval does contain zero.