A statistician wants to estimate the mean age of all college students. A random sample of 25
students indicates that the mean age is 24.6 years. Past studies showed that the standard deviation
is 1.3 years and the population is normally distributed. Find a 95% confidence interval for the mean
the std of the mean age is 1.3/sqrt(25) = 0.26 y
the z alpha for 95% confidence interval for the mean age is 1.98
thus the interval is
24.6 -1.98*.26< x<24.6*1.98*.26
where did you the 1.98 from?
thank you i found my answer
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