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A random sample of n measurements was selected from a population with unknown mean μ and standard deviation σ. Calculate a 99% confidence interval for μ for each of the following situations:
(a) n=85, x¯=23.8, s=3.75 ≤μ≤
(b) n=120, x¯=62.7, s=4.52 ≤μ≤
(c) n=80, x¯=50.6, s=2.67 ≤μ≤
(d) n=85, x¯=91, s=2.73 ≤μ≤
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