Question

Your poll of 620 randomly selected residents of a Chicago suburb indicates that 32% of them would support the introduction of a halfway house for drug addicts in their community. Match the following elements needed to construct a 95% confidence interval.

1)Lower limit--------------->A).037

2)Margin of error----------> B)1.96

3)Critical value-----------> C).019

4)Standard error for proportions----------> D).283

Answer 1

We have given,          
          
  
n=620      
Estimate for sample proportion=
Level of significance is =0.05  
Z critical value(using Z table)=1.96  

Margin of error

Confidence interval formula is          


=(0.28,0.36)          
Lower limit for confidence interval=0.283
          
Upper limit for confidence interval=0.36

1)Lower limit----------> D).283 2)Margin of error-------------->A).037 3)Critical value-----------> B)1.96 4)Standard error for proportions------------> C).019