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An environmentalist wants to find out the fraction of oil tankers that have spills each month....

An environmentalist wants to find out the fraction of oil tankers that have spills each month. Step 2 of 2 : Suppose a sample of 355 tankers is drawn. Of these ships, 299 did not have spills. Using the data, construct the 85% confidence interval for the population proportion of oil tankers that have spills each month. Round your answers to three decimal places.

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Expert Solution

We have given,                  
                  
x=355-299=56              
n=355              
Estimate for sample proportion=0.1577      
Level of significance is =1-0.85=0.15          
Z critical value(using Z table)=1.44          
                  
Confidence interval formula is                  


=(0.1298,0.1856)
                  
Lower limit for confidence interval=0.130      
                  
Upper limit for confidence interval=0.186      

orchestra answered 1 year ago
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