Question 884763
A field test for a new exam was given to randomly selected freshmen. The exams were graded, and the sample mean and sample standard deviation were calculated.
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 Based on the results, the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 6% of 80%.
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 Is the confidence interval at 90%, 95%, or 99%? 
Ans:: 9 out of 10 = 90%
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What is the margin of error? 
Ans: 2*ME = 80%-6% = 72%
ME = 36%
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Calculate the confidence interval and explain what it means in terms of the situation.
90% CI:: 0.06 < p < 0.80
We have 90% confidence the population proportion is between 6% and 80%
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Cheers,
Stan H.