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 10 degrees of freedom. (b) Determine the critical value(s) for a left-tailed test of a population mean at the alphaequals0.01 level of significance based on a sample size of nequals20. (c) Determine the critical value(s) for a two-tailed test of a population mean at the alphaequals0.01 level of significance based on a sample size of nequals11. LOADING... Click here to view the t-Distribution Area in Right Tail. (a) t Subscript critequals ▼ plus plus or minus minus nothing (Round to three decimal places as needed.) (b) t Subscript critequals ▼ plus or minus plus minus nothing (Round to three decimal places as needed.) (c) t Subscript critequals ▼ minus plus plus or minus nothing (Round to three decimal places as needed.)