Math 1530 Spring 2017 T&TH; (1215-1:13) S11 Test: Practice Test 3 (Copy) This Qu

Question

Math 1530 Spring 2017 T&TH; (1215-1:13) S11 Test: Practice Test 3 (Copy) This Question: 1 pt 13 38 complete) use he sample data and contdence levelgiven bekow toconpicto panse) rough Aresearthinsinne pol asked responaerts they actedlo ancy atat aner in the a Find the test pont estimate or Te populaton proponon P (RoundloThree decimal places as needed the value of the magnerero E (Round decimal places as needed) oorsturt the condence rwervan (Round to derima pates as needed Cick your arm Time Remaining: 01 E2:16 Submit This Test: 38 pts poss

Explanation / Answer

SolA:

Sample proportion=p^=x/n=960/2639=0.364

Solutionb:

z alpha/2 for 99%=2.576

margin of error=z sqrt[p^(1-p^)/n]

=2.576sqrt(0.364(1-0.364)/2639)

E =0.0241

Solutionc:

99% Confidence interval for proportion are

lower limit=sample proportion -margin of error

=0.364-0.0241

=0.339

upper limit=

sample proportion +margin of error

=0.364+0.0241

=0.388

0.339<p<0.388

Solutiond:

Confidence interval tells about the interval range for population parameter ,here proportion.

we are 99% confodent that the true population proportion lies in between

0.339 and 0.388

Answer A

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