Question 13, 9.2.7 Part 4 on: Homework: Ch9 HW One Sample Confidence Intervals Determine the tvalue in each of the cases a Click the icon to View the table of areas under the tdistn'bution. (a) Find the tvalue such that the area in the right tail is 0.025 with 9 degrees of freedom. 2.252 (Round 10 three decimal places as needed.) (b) Find the tvalue such that the area in the right tail is 0.20 with 11 degrees of freedom. 0.8?6 (Round to three decimal places as needed.) (c) Find the tvalue such that the area left of the tvalue is 0.25 With 17 degrees of freedom. [Hint: Use symmetry] 0.689 (Round to three decimal places as needed.) (:1) Find the critical tvalue that corresponds to 30% condence. Assume ? degrees of freedom. (Round to three decimal places as needed.)