In: Statistics and Probability
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.)