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 2380 subjects randomly selected from an online group involved with ears. 991 surveys were returned. Construct a 90​% confidence interval for the proportion of returned surveys.   LOADING... Click the icon to view a table of z scores.       Question content area bottom Part 1 ​a) Find the best point estimate of the population proportion p.

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