A random sample of
n
measurements was selected from a population with unknown mean
μ
and standard deviation
σ
. Calculate a 95% confidence interval for
μ
for each of the following situations:
(a)
n=105,x¯=72,s=2.12
≤μ≤
(b) n=100,x¯=26.1,s=3.91
≤μ≤

(c) n=80,x¯=61,s=3.79
≤μ≤

(d) n=95, x¯=33.4,s=2.31
≤μ≤