a. Use the one-mean t-interval procedure with the sample mean, sample size, sample standard deviation, and confidence level given below to find a confidence interval for the mean of the population from which the sample was drawn.
b. Obtain the margin of error by taking half the length of the confidence interval.
c. Obtain the margin of error by using the formula tα/2 • s/√n.
x = 22
n = 25
s = 4
confidence level = 99%
a. The 99% confidence interval about μ is ______ to _______
b.
c.