iPad 10:28 PM wamap.org 9.2 2. Express The Confidence Interval 78.9% Assessment

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iPad 10:28 PM wamap.org 9.2 2. Express The Confidence Interval 78.9% Assessment Quiz7 Timelimit: 50 minutes. 36:57 remaining. x) Show Intro/Instructions Questions Q1 [10/10] Q 2 [10/10 Q 3 [95/ 10] Q5 (0/10) Grade: 29.5/50 Out of 200 people sampled, 120 preferred Candidate A. Based on this, estimate what proportion of the voting population (p) prefers Candidate A. Use a 90% confidence level, and give your answers as decimals, to three places. Points possible: 10 This is attempt 1 of 2 Message instructor about this question Submit

Explanation / Answer

Ans:

z value for 90% CI is 1.645

sample proportion=120/200=0.6

95% CI for p

=0.6+/-1.645*sqrt(0.6*(1-0.6)/200)

=0.6+/-0.057

=(0.543,0.657)

0.543<p<0.657

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