# Question: A random sample of 90 observations produced a mean

A random sample of 90 observations produced a mean = 25.9 and a standard deviation s = 2.7.

a. Find a 95% confidence interval for the population mean µ.

b. Find a 90% confidence interval for µ.

c. Find a 99% confidence interval for µ.

a. Find a 95% confidence interval for the population mean µ.

b. Find a 90% confidence interval for µ.

c. Find a 99% confidence interval for µ.

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