Question

Express the confidence interval ( 70.3 % , 80.1 % ) ( 70.3 % , 80.1 % ) in the form of ˆ p ± M E p ^ ± M E .

Answer 1

Solution :

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

Point estimate = = ( 70.3% + 80.1% ) / 2

Point estimate = = 75.2%

Margin of error = E = Upper confidence interval -

Margin of error = E = 80.1% - 75.2%

Margin of error = E = 4.9%

± ME

= 75.2%  ± 4.9%