(a) Determine the critical value(s) for a right-tailed test of a population mean at the α=0.10
level of significance with
20
degrees of freedom.
(b) Determine the critical value(s) for a left-tailed test of a population mean at the
α=0.10
level of significance based on a sample size of
n=15.
(c) Determine the critical value(s) for a two-tailed test of a population mean at the
α=0.01
level of significance based on a sample size of
n=11.