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Confidence limit for the proportion students passing

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1) A sample of 18 widgets has a mean of 57.100 and standard deviation of 7.350. At 99% confidence, the upper limit with 3 decimal places is 

2) A statistics course has 20 students in which 71% passed. At 95% confidence, the upper  confidence limit for the proportion students passing with 3 decimal places is

3) A statistics course has 22 students in which 83.0% passed. At 90% confidence, the lower confidence limit for the proportion students passing with 3 decimal places is

Reference no: EM132154397

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