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A sample of size 15 is taken from a larger population; the sample mean is calculated as 12 and the sample variance as 25. What

A sample of size 15 is taken from a larger population; the sample mean is calculated as 12 and the sample variance as 25. What is the 95% confidence interval for the population mean ?

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(9.75, 14.65)

(9.13, 14.67)

(9.23, 14.77)

(9.78, 14.78)

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