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A survey of 50 students in grades 4 through 12 found 68% have classroom Wi-Fi access....

A survey of 50 students in grades 4 through 12 found 68% have classroom Wi-Fi access. Find the 99% confidence interval of the population proportion.

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Answer #1

We have given,              
              
  
n=50          
Estimate for sample proportion=0.68  
Level of significance is =1-0.99=0.01      
Z critical value(using Z table)=2.576      
              
Confidence interval formula is              


=(0.5101,0.8499)
              
Lower limit for confidence interval=0.5101  
              
Upper limit for confidence interval=0.8499  

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