Determine the t-value in each of the cases. FClick 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 0.20 with 27 degrees of...

Determine the t-value in each of the cases. FClick 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 0.20 with 27 degrees of freedom. (Round to three decimal places as needed.) (b) Find the t-value such that the area in the right tail is 0.10 with 15 degrees of freedom (Round to three decimal places as needed.) (c) Find the t-value such that the area left of the t-value is 0.15 with 11 degrees of freedom. (Hint: Use symmetry.) (Round to three decimal places as needed.) (d) Find the critical t-value that corresponds to 90% confidence. Assume 23 degrees of freedom. (Round to three decimal places as needed.)