Use the sample data and confidence level given below to complete parts (a) through (d)
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2625 subjects randomly selected from an online group involved with
ears. 1014 surveys were returned. Construct a 90% confidence interval for the proportion of returned surveys.
a) Find the best point estimate of the population proportion p.
n
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E
EN
(Round to three decimal places as needed)
c) Construct the confidence interval.
D