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

2565

subjects randomly selected from an online group involved with ears.

1033

surveys were returned. Construct a

90%

confidence interval for the proportion of returned surveys.

Question content area bottom

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

d) Choose the correct answer below.

A.

One has

90%

confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion.

B.

One has

90%

confidence that the sample proportion is equal to the population proportion.

C.

90%

of sample proportions will fall between the lower bound and the upper bound.

D.

There is a

90%

chance that the true value of the population proportion will fall between the lower bound and the upper bound.