A random sample of ?n measurements was selected from apopulation with standard deviation ?=11.7 and unknown mean ?.Calculate a 95% confidence interval for ? for each of the followingsituations:
(a) ?=60, ?=85
≤?≤
(b)Â Â ?=75, ?=85
≤?≤
(c)Â Â ?=100, ?=85
≤?≤
