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In: Statistics and Probability

A random sample of n measurements was selected from a population with unknown mean mu and...

A random sample of n measurements was selected from a population with unknown mean mu and standard deviation sigma equals 20 for each of the situations in parts a through d. Calculate a 95​% confidence interval for mu for each of these situations.

a. n=60​, overbar =29 ​(Round to two decimal places as​ needed.)

b. n=250​, xoverbare=113 ​(Round to two decimal places as​ needed.)

c. n=90​, xoverbar=18 ​(Round to two decimal places as​ needed.)

d. n=90​, xoverbar=4.1 ​(Round to two decimal places as​ needed.)

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