A random sample of n measurements was selected from a population with standard deviation σ=19.8 and...

A random sample of n measurements was selected from a population with standard deviation σ=19.8 and unknown mean μ. Calculate a 99 % confidence interval for μ for each of the following situations (I did the third one right but can't get these two to work so figured I'd ask before emailing my instructor):

(a) n=65, x¯=96.7

90.36380962, 103.0361904 = wrong

(b) n=80, x¯=96.7

90.989, 102.411 = wrong

Am I wrong or is it the system lol?

Expert Solution

Solution:

(a)

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(b)

orchestra answered 2 years ago

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