SOLUTION: Use the sample data and confidence level given below to complete part (a).
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed
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In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed
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Question 1182739: Use the sample data and confidence level given below to complete part (a).
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2394 subjects randomly selected from an online group involved with ears. 931 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.
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(Round to three decimal places as needed.) Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! p hat is 931/2394=0.3889
90% half-interval is z(0.95)*sqrt(p*(1-p)/n)
=1.645*sqrt(0.3889*0.6111/2394)
=0.016
so the interval is (0.373, 0.405)
