Determine the critical values for these tests of a population standard deviation. (a) A right-tailed test with 12 degrees of freedom at the o = 0.05 level of significance (b) A left-tailed test for a sample of size n= 26 at the o = 0.1 level of significance (c) A two-tailed test for a sample of size n =30 at the o = 0.1 level of significance Click the icon to view a table a critical values for the Chi-Square Distribution. (a) The critical value for this right-tailed test is (Round to three decimal places as needed.)