Question

Express the confidence interval 18.5 % < p < 26.7 % in the form of ˆp ± ME.

% ±.    %

Answer 1

Solution :

The confidence interval 18.5 % < p < 26.7 %

Point estimate = = (Lower confidence interval + Upper confidence interval ) / 2

Point estimate = = (0.185 + 0.267) / 2

Point estimate = = 0.226 = 22.6%

Margin of error = E = Upper confidence interval -

Margin of error = E = 0.267 - 0.226

Margin of error = E = 0.041 = 4.1%

± ME  

= 22.6%  ± 4.1%