Example of Confidence Interval 3: t-distribution HD

youtube 01.05.2011

Statistics: A large math class receives exam grades. Grades are normally distributed with an unknown standard deviation sigma. A random sample of 25 grades has mean 70 and standard deviation s=10. Find the 95% confidence interval for the unknown population mean. What happens if sigma = 10?

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Example of Confidence Interval 3: t-distribution HD

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