2 Proportion Interval

label Statistics
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In a sample of 80 Americans, 65% wished that they were rich. In a sample of 90 Europeans, 70% wished that they were rich. Find the 99% confidence interval for the difference of the two proportions.   

May 12th, 2015

Americans    80 * 0.65 = 56

Europeans  90* 0.7= 63 

total sample is 170 and selected 119 

potion that is rich is 70% of both the Americans and Europeans.

99% halved is 0.445 on the t table it yields approximately 1.96

mean is 119 and margin of error is 1.96*0.99

the propotional interval is 119 - 1.9404=120.9404    or 119+1.94.4 =117.0496



May 12th, 2015

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May 12th, 2015
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