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# A researcher is going to perform a significance test for the difference between two population proportions (H0 : p1 = p2) based on the following sample statistics:X1 = 12,n1 = 20,X2 = 15,n2 = 30. Which of the following would be used to compute the value of z for this test? The n’s are too small to justify the use of z-procedures in this situation. 2. A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance test for a difference in the proportions of workers in Dalto City and East Dettweiler who work at more than one job, what’s the pooled value for p?, and what’s the pooled standard error of the difference between the two sample proportions, respectively? .5, .0303 .249, .017 .249, .0009 .251, .0303 .249, .0303 3. Consider the following data collected in two recent surveys of whether voters in cities A and B favor a ballot proposition in the next election. City Sample Size In Favor A 615 463 B 585 403 Suppose you’re going to conduct a significance test to see if there’s a difference between the two population proportions. What’s the standard error of the estimate? 4. A random sample of 250 men yielded 175 who said they’d ridden a motorcycle at some time in their lives, while a similar sample of 215 women yielded only 43 that had done so. Find a 99% confidence interval for the difference between the proportions of men and women who have ridden motorcycles. .5 ± .078 .5 ± .103 .5 ± .085 .4688 ± .085 .5 ± .112

A researcher is going to perform a significance test for the difference between two population proportions (H0 : p1 = p2) based on the following sample statistics:X1 = 12,n1 = 20,X2 = 15,n2 = 30. Which of the following would be used to compute the value of z for this test?
 The n‘s are too small to justify the use of z-procedures in this situation.
2. A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance test for a difference in the proportions of workers in Dalto City and East Dettweiler who work at more than one job, what’s the pooled value for p?, and what’s the pooled standard error of the difference between the two sample proportions, respectively?
 .5, .0303 .249, .017 .249, .0009 .251, .0303 .249, .0303
3. Consider the following data collected in two recent surveys of whether voters in cities A and B favor a ballot proposition in the next election.

 City Sample Size In Favor A 615 463 B 585 403

Suppose you’re going to conduct a significance test to see if there’s a difference between the two population proportions. What’s the standard error of the estimate?

4. A random sample of 250 men yielded 175 who said they’d ridden a motorcycle at some time in their lives, while a similar sample of 215 women yielded only 43 that had done so. Find a 99% confidence interval for the difference between the proportions of men and women who have ridden motorcycles.
 .5 ± .078 .5 ± .103 .5 ± .085 .4688 ± .085 .5 ± .112

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