Arandom sample of n 57 observations produced a mean x

A random sample of n = 57 observations produced a mean x = 30.8 and a standard deviation s=2.3

A) Find a 90% confidence interval for population mean µ.

B) If we decrease the same size to n=25 instead of 57. Construct a 95% confidence interval for µ.

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Arandom sample of n 57 observations produced a mean x : a random sample of n 57 observations produced a mean x 30.8 and a standard deviation s2.3a find a 90 confidence

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