Question

Construct a confidence interval of the population proportion at the given level of confidence. x=160, n =200, 90 % confidence The lower bound is ____. The upper bound is ____.

Answer 1

We have given,          
          
x=160      
n=200      
Estimate for sample proportion=0.8
Z critical value(using Z table)=1.645  
Confidence interval formula is

=(0.753,0.847)

          
Lower limit for confidence interval=0.753
          
Upper limit for confidence interval=0.847