Complete parts ​(a) through ​(c) below. ​(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=0.05 level of significance based on a sample size of n=10. ​(c) Determine the critical​ value(s) for a​ two-tailed test of a population mean at the α=0.10 level of significance base

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