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Suppose a consumer advocacy group would like to conduct a survey to find the proportion p...

Suppose a consumer advocacy group would like to conduct a survey to find the proportion p of consumers who bought the newest generation of an MP3 player were happy with their purchase. How large a sample n should they take to estimate p with 4% margin of error and 95% confidence?

Math   Statistics-And-Probability   
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Answer #1

Preliminary estimate for proportion (Unknown) = 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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