Answer:
(0.1886,0.5724)
Step-by-step explanation:
Given that in a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2457 subjects randomly selected from an online group involved with ears. 935 surveys were returned.
Sample proportion of returned surveys = [tex]\frac{935}{2457} =0.3805[/tex]
Sample size n =2457
q = [tex]1-0.3805 = 0.6195[/tex]
Std error of proportion = [tex]\sqrt{\frac{pq}{n} } =0.00979[/tex]
a) the best point estimate of the population proportion p.=0.3805
b) Margin of error = 1.96* std error = [tex]0.1919[/tex]
c) Confidence interval = [tex](0.3805-0.1919, 0.3805+0.1919)\\= (0.1886,0.5724)[/tex]
