Question: Find the reliability factors based on the t-distribution for the following confidence intervals for the population mean (df = degrees of freedom, n = sample

Find the reliability factors based on the t-distribution for the following confidence intervals for the population mean (df = degrees of freedom, n = sample size):
A. A 99 percent confidence interval, df = 20.
B. A 90 percent confidence interval, df = 20.
C. A 95 percent confidence interval, n = 25.
D. A 95 percent confidence interval, n = 16.

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