Complete parts (a) through (c) below. (a) Determine the critical value(s) for a right-tailed test of a population mean at the alphaequals0.05 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 alphaequals0.10 level of significance based on a sample size of nequals15. (c) Determine the critical value(s) for a two-tailed test of a population mean at the alphaequals0.05 level of significance based on a sample size of nequals19. LOADING... Click here to view the t-Distribution Area in Right Tail. Question content area bottom Part 1 (a) t Subscript critequals minus plus or minus plus enter your response here (Round to three decimal places as needed.) (a) t Subscript critClick here to view the t-Distribution Area in Right Tail.(Round to three decimal places as needed.) TextbookAsk my instructor pop-up content starts t-Distribution Area in Right Tail