Please help with these from my chapter 19 assignment, distribution table uploaded

\f\fComplete parts (a) through (c) below. (a) Determine the critical value(s) for a right-tailed test of a population mean at the a = 0.01 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 = 0.01 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 = 0.10 level of significance based on a sample size of n = 12. Click here to view the t-Distribution Area in Right Tail. (a) tcrit= (Round to three decimal places as needed.)To test Ho: p=40 versus H1 : p