Homework Help: Statistics

Posted by John on Monday, November 5, 2012 at 9:52am.

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 p̂, and what's the pooled standard error of the difference between the two sample proportions, respectively?

.5, .0303

.249, .0009

.249, .017

.251, .0303

.249, .0303

Statistics - MathGuru, Monday, November 5, 2012 at 7:27pm
Standard error = √(p1(1-p1)/n1 + p2(1-p2)/n2)

Your data:
n1 = 384
n2 = 432
p1 = 112/384
p2 = 91/432

If you substitute the data into the formula above, you should find standard error to be .0303, which will narrow down your choices. I'll let you determine the pooled value for p.
Statistics - John, Monday, May 20, 2013 at 11:41pm
@MathGuru you're useless. You only solve the obvious and then leave us hanging.

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