Question

In: Statistics and Probability

In a study of cell phone use and brain hemispheric​ dominance, an Internet survey was​ e-mailed...

In a study of cell phone use and brain hemispheric​ dominance, an Internet survey was​ e-mailed to

2592

subjects randomly selected from an online group involved with ears.

913

surveys were returned. Construct a

99​%

confidence interval for the proportion of returned surveys.

Solutions

Expert Solution

We have given,              
              
x=913          
n=2592          
Estimate for sample proportion=   0.3522  
Level of significance is =1-0.99=0.01      
Z critical value(using Z table)=2.576      
              
Confidence interval formula is              


=(0.3280,0.3764   )
          
Lower limit for confidence interval=0.328  
              
Upper limit for confidence interval=0.3764  


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