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Test4Solutions1 - I_CrrC Statistics Probability...

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I_CrrC- -- Statistics & Probability - Test #4 (Chapter 18 and Confidence Intervals) Show All Work! ! ! 1. A state's Department of Education reports that 12% of the high school students in that state attend private high schools. The State University wonders if the percentage is the same in their applicant pool. Admissions officers plan to check a random sample of the over 10,000 applications on file to estimate the percentage of students applying for admissiqn who attend private schools. a. They actually select a random sample of 450 applications, and find that 46 of those students g - 450 attend private schools. Create the confidence interval. p = 46 - s;yn Z 450 0. I O'L,. b. Interpret the confidence interval in this context 6 c. If we increased the confidence level, would the Margin of Error increase or decrease? Please explain your answer. I IF ; I , ~ ~ ~ ~ i c i tt.e t c n ~ t ' d e n a ~ v e i , ~ t - - e ~ ~ l r , i ~ of .prpbp would '~ncwQcc bpcau6a +h, +<gm w o ~ i d would be ~arpter n ~ m h r * .
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