Question

Express the confidence interval 35.7% < p < 42.3% in the form of ˆp ± ME
% ± %

Answer 1

Solution :

Given that,

Lower confidence interval = 0.357

Upper confidence interval = 0.423

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

= (0.357 + 0.423) / 2

= 0.39

= 0.39

Margin of error = E = Upper confidence interval - = 0.423 - 0.39 = 0.033

ME = 39% 0.3%