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how many car owners must be surveyed if we want to estimate the percentage of car...

how many car owners must be surveyed if we want to estimate the percentage of car owners who purchased new cars with 95% confidence that the sample percentage is in error by no more than four percentage point?

Math   Statistics-And-Probability   
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Answer #1

Preliminary estimate for proportion (not Known) = 0.5          
Margin of error =E=0.04          
Level of significance =1-0.95=0.05          
Z critical value is(by using Z table)=1.96      
                              
Sample size


=600.23
Therefore, sample size approximately will be 601
                          

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