Statistics- A random sample of n measurements was selected

QUESTION

A random sample of n measurements was selected from a population with unknown mean μ and standard deviation σ. Calculate a99% confidence interval forμfor 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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