Statistics questions

label Statistics
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sample of 1302 car buyers is drawn 312 preferred foreign over domestic p= 0.240. Construct the 90% confidence interval for the population proportion of buyers prefer foreign over domestic lower bound and upper bound round answers to 3 decimal places

Mar 4th, 2015

p = 0.24

(1-p)=0.76

standard error = sqrt(0.24*0.76/1302) =0.0118

90% value =1.645

90% Confidence interval = 0.24- 0.0118*1.645 to 0.24 +0.0118 *1.645

0.24-0.019 to 0.24+0.019 

0.221 to 0.259

or 0.22 to 0.26

Mar 4th, 2015

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