SOLUTION: A survey was conducted to determine the percentage of students at a post secondary institution who prefer the new alpha-grading system. The responses from a random sample of 30 stu

Question 750491: A survey was conducted to determine the percentage of students at a post secondary institution who prefer the new alpha-grading system. The responses from a random sample of 30 students are shown below.
YES-18, NO-12
Construct a 98.5% confidence interval for a population proportion who prefer the new alpha-grading system.
please show all steps. thank you
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A survey was conducted to determine the percentage of students at a post secondary institution who prefer the new alpha-grading system. The responses from a random sample of 30 students are shown below.
YES-18, NO-12
Construct a 98.5% confidence interval for a population proportion who prefer the new alpha-grading system.
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p-hat = 18/30 = 0.6
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ME: 2.4324*sqrt(0.6*0.4/30) = 0.2176
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98.5% CI: 0.6-0.2176 < p < 0.6+0.2176
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Cheers,
Stan H.

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