Complete parts (a) through (c) below. [a] Determine the critical value(s) for a righttailed test of a population mean at the a = 0.05 level of signicance with '15 degrees of freedom. [b] Determine the critical value(s} for a lefttailed test of a population mean at the c: = 0.01 level of signicance based on a sample size of n = 10. [c] Determine the critical value(s) for a Mc-tailed test cfa population mean at the ct = 0.05 level of signicance based on a ample size of n =16. Click here to View the tDistribution Area in Right Tail. (a) la.\" = + 1753 (Round to three decimal places as needed} [b] tcn-l = Y (Round to three decimal places as needed.) [c] [em = Y (Round to three decimal places as needed.)