Question

a.) Given a normal distribution with σ = 0.380. Find the required sample size for a 95% confidence level (estimating the mean), given a margin-of-error of 6%.

b.) Given the sample results taken from a normal population distribution: mean = 4.65, σ = 0.32, and n = 17.
For a 99% confidence interval, find the margin-of-error for the population mean. (use 2 decimal places)

c.) Given the sample results taken from a normal population distribution: mean = 1.25, σ = 1.95, and n = 9.
Find the upper limit of the 90% confidence interval for the population mean. (use 2 decimal places)

Answer 1