MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text: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 2486 subjects randomly selected from an online group involved with ears. 944 surveys were returned. Construct a 90% confidence interval for the
proportion of returned surveys.
E Click the icon to view a table of z scores.
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=D
(Round to three decimal places as needed.)
c) Construct the confidence interval.
O<p<O
(Round to three decimal places as needed.)
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d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below.
O A. 90% of sample proportions will fall between the lower bound and the upper bound.
O B. 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.
OC. There is a 90% chance that the true value of the population proportion will fall between the lower bound and the upper bound.
O D. One has 90% confidence that the sample proportion is equal to the population proportion.
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