Question

Express the confidence interval 78.7 % < p < 96.5 % in the form of ˆ p ± M E .

% ± %

Answer 1

Solution :

given that

Lower confidence interval = 0.787

Upper confidence interval = 0.965

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

=   = (0.787+0.965) / 2

Point estimate = =0.876

Margin of error = E = Upper confidence interval -

=0.965 - 0.876

Margin of error = E = 0.089

+ / - E

87.6 % + / 8.9%