Chrome- Take a Test-Angena Pipps e- e Secure htps//www.mathal com/Student/Player

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Chrome- Take a Test-Angena Pipps e- e Secure htps//www.mathal com/Student/PlayerTest.asp?testld 1744927758centerwin-yes MAT113 Intro to Stats (UMM-Spring 2018) Angleana Phipps& 3/24/18 4:15 PM MyLab o My Cours This Question: 1 pt Quiz: Quiz #3 (Ch 7 & 8) Submit Quiz 1 of 7 This Quiz: 7 pts possible e o Course Use the sample data and contidence level given below to complete parts (a) through (d) 4.16 PM in a study ot cell phone use and bran hemispherc dominance. an irvermet survey was e-maled to 2484 subjecs randomly selected from an online group invoved wth ears. 1 128 surveys were reurned. Construct a 90% comidence interval for 'he proporlin ot teturned surveys. EEE Cick the icon to view a table of z scores a) Find the best point estimate ot the populaion proportion p Study P Round to three decimel places as needed) eText Chapter Tools b) Identify the value of the mergin of ertorE (Round tree decimal places as needed ) c) Construct the confidence interval Round to three decimal places as needed.) d) Wrte a statemend that currectly interprets the conndence interval. Choose the comect answer beow. Cick to select your answer(s). Course Save for Later 4:16 O

Explanation / Answer

a) p = 1128 / 2484 = 0.454

b) Z for 90 % confidence interval = Z0.05 = 1.65

E = Z0.05 * sqrt(p * (1 - p) / n)

    = 1.65 * sqrt(0.454 * (1 - 0.454) / 2484)

    = 0.016

c) p-E < p < p+E

or, 0.454 - 0.016 < p < 0.454 + 0.016

or, 0.438 < p < 0.470

d) options are not given in the question

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