Complete parts (a) through (c) below. (a) Determine the critical value(s) for a right-tailed test of a population mean at the a = 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 a = 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 c = 0.01 level of significance based on a sample size of n = 11.
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