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# We take a simple random sample of size 50 from a population with unknown variance. We find the sample mean is x= 25 and the sample standard deviation...

.We take a simple random sample of size 50 from a population with unknown variance. We find the sample mean is ̄x= 25 and the sample standard deviation is s = 15.

(a) Give the 90% confidence interval for the population mean μ .

(b) Give the 95% confidence interval for the population mean μ .

(c) Give the 99% confidence interval for the population mean μ .