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According to a PARADE poll of 1200 Americans, 75% of the respondents claimed that they had...

According to a PARADE poll of 1200 Americans, 75% of the respondents claimed that they had changed their behavior I an attempt to lower their risks of heart disease.  Assume that these 1200 people represent a random sample.  

a.) find a 98% confidence interval for the percentage of all Americans who say that they have changed their behavior to lower their risks of heart disease.

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Expert Solution

We have given,              
              
          
n=1200          
Estimate for sample proportion=   0.75  
Level of significance is =0.02      
Z critical value(using Z table)=2.326      
              
Confidence interval formula is              


=(0.7209 , 0.7791)              
Lower limit for confidence interval=0.7209  
              
Upper limit for confidence interval=0.7791  

milcah answered 7 months ago
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