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 2580 subjects randomly selected from an online group involvedwith ears. 975 surveys were returned. Construct a 90% confidence interval for the proportion of returned surveysClick the icon to view a table of z scoresa) Find the best point estimate of the population proportion p(Round to three decimal places as needed)

Answer 1

Given:

Sample size, n= 2580

Surveys returned = 975

Confidence interval = 90%

Let's solve for the following:

• (a). Find the best point estimate of the population proportion p.

To find the population proportion, apply the formula:

`p^(\prime)=(x)/(n)`

Where:

x = 975

n = 2580

Hence, we have:

`\begin{gathered} p^(\prime)=(975)/(2580) \\ \\ p^(\prime)=0.378 \end{gathered}`

Therefore, the best point estimate of the population proportion is 0.378

ANSWER:

(a). 0.378