Determine the critical values for these tests of a population standard deviation. (a) A right­tailed test with 15 degrees of freedom at the α = 0.01 level of significance (b) A left­tailed test for a sample of size n = 31 at the α = 0.05 level of significance

Determine the critical values for these tests of a population standard deviation.
(a) A right­tailed test with 15 degrees of freedom at the α = 0.01 level of significance
(b) A left­tailed test for a sample of size n = 31 at the α = 0.05 level of significance
(c) A two­tailed test for a sample of size n = 25 at the α = 0.01 level of significance
Click the icon to view a table a critical values for the Chi­Square Distribution.
1
(a) The critical value for this right­tailed test is 30.578 .
(Round to three decimal places as needed.)
(b) The critical value for this left­tailed test is .
(Round to three decimal places as needed.)
(c) The critical values for this two­tailed test are .
(Round to three decimal places as needed. Use a comma to separate answers as needed.)