A random sample of n measurements was selected from a population with unknown mean u and known standard deviation. Calculate a 90% confidence interval for for each of the situations given in parts a...

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Extracted text: A random sample of n measurements was selected from a population with unknown mean u and known standard deviation. Calculate a 90% confidence interval for for each of the situations given in parts a through e. a. n= 70, x= 26, o² = = 13 ( 25.29 , 26.71 ) (Round to two decimal places as needed.) b. n = 150, x= 118, o2 = 24 ( 117.34 , 118.66 ) (Round to two decimal places as needed.) c.n = 90, x= 18, o = 0.2 (Round to two decimal places as needed.)