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The interval(3, 15) is the 95% confidence interval for a population parameter from a random sample of size 25, where the random sample isdrawn from

The interval(3, 15) is the 95% confidence interval for a population parameter from a random sample of size 25, where the random sample isdrawn from a normal distribution with unknown variance2 (sigma squared). Find the upper limit for the 90% confidence interval for the population mean

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