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 2529 subjects randomly selected from an online group involved with ears. 1172 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. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E=____ (Round to three decimal places as needed.) c) Construct the confidence interval. ___
subjects randomly selected from an online group involved with ears.
surveys were returned. Construct a
confidence interval for the proportion of returned surveys.
a) Find the best point estimate of the population proportion p.
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E=____
(Round to three decimal places as needed.)
c) Construct the confidence interval.
___<p<____
(Round to three decimal places as needed.)
d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below.
A.
90%
of sample proportions will fall between the lower bound and the upper bound.
B.
One has 90% confidence that the sample proportion is equal to the population proportion.
C.
There is a 90% chance that the true value of the population proportion will fall between the lower bound and the upper bound.
D.
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.
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