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

age.

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

24.08<x<25.1

where did you the 1.98 from?

thank you i found my answer

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