(a) Determine the critical value(s) for a right-tailed test of a population mean at the a = 0.10 level of significance with 15 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 20. (c) Determine the critical value(s) for a two-tailed test of a population mean at the a 0.05 level of significance based on a sample size of n 13. E: Click bere to view the t-Distribution Area in Right Tail

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