Determine the t-value in each of the cases. Click the icon to view the table of areas under the t-distribution. ... (a) Find the t-value such that the area in the right tail is 0.25 with 21 degrees of freedom. .686 (Round to three decimal places as needed.) (b) Find the t-value such that the area in the right tail is 0.01 with 27 degrees of freedom. 2.473 (Round to three decimal places as needed.) (c) Find the t-value such that the area left of the t-value is 0.05 with 5 degrees of freedom. [Hint: Use symmetry.] -2.015 (Round to three decimal places as needed.) (d) Find the critical t-value that corresponds to 99% confidence. Assume 22 degrees of freedom. (Round to three decimal places as needed.)