Question

Use the given confidence interval to find the margin of error and the sample proportion.

​(0.6650.665​,0.6930.693​)

E =

Answer 1

Given confidence interval is ( 0.665 , 0.693)

Margin of error = Width of confidence interval / 2

= ( 0.693 - 0.665) / 2

E = 0.014

Sample proportion = Lower bound of confidence interval + margin of error

(Since confidence interval in terms of sample proportion and margin of error is written as ( - E , + E) )

Sample proportion = 0.665 + 0.014

= 0.679