Question

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 2595 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.
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.)

Explanation:

Step1: Calculate sample proportion

The formula for sample proportion $\hat{p}$ is $\hat{p}=\frac{x}{n}$, where $x$ is the number of successes (returned surveys) and $n$ is the sample size (emailed surveys). Here, $x = 931$ and $n=2595$.
$\hat{p}=\frac{931}{2595}$

Step2: Simplify the fraction

$\frac{931}{2595}\approx0.359$

Answer:

$0.359$