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Professor for one of your classes takes random sample of 100 student grades and obtains...

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Professor for one of your classes takes random sample of 100 student grades and obtains a mple mean of 85 with a sample standard deviation of 6 7 a Construct a 95 confidence interval for the true average grade b If this professor guessed that the standard deviation for grades overall is 10 what sample size would be required to obtain an interval width of 3 for a confidence level of 90

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