Solved: Estimate confidence interval for the population mean with, Basic Statistics

Estimate confidence interval for the population mean with

A sample mean is x¯ = 40 and sample size is n = 50.

Estimate Confidence Interval for the population mean with Confidence Level 99% in two cases:

Case A: The standard deviation of the population is known, σ=10.

Tip: use z-factor from the Normal Distribution Table.

Case B: The standard deviation of the population is unknown, but the sample standard deviation is given s=15.

Tip: use t-factor from the t-Distribution Table.

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