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

2541

subjects randomly selected from an online group involved with ears.

1171

surveys were returned. Construct a

90%

confidence interval for the proportion of returned surveys.

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Part 1

a) Find the best point estimate of the population proportion p.

enter your response here

(Round to three decimal places as needed.)

Part 2

b) Identify the value of the margin of error E.

E=enter your response here

(Round to three decimal places as needed.)

Part 3

c) Construct the confidence interval.

enter your response here

(Round to three decimal places as needed.)

Part 4