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​(a) Find the​ t-value such that the area in the right tail is 0.15 with 18...

​(a) Find the​ t-value such that the area in the right tail is 0.15 with 18 degrees of freedom. nothing ​(Round to three decimal places as​ needed.) ​

(b) Find the​ t-value such that the area in the right tail is 0.01 with 9 degrees of freedom. nothing ​(Round to three decimal places as​ needed.) ​

(c) Find the​ t-value such that the area left of the​ t-value is 0.02 with 11 degrees of freedom.​ [Hint: Use​ symmetry.] nothing ​(Round to three decimal places as​ needed.) ​

(d) Find the critical​ t-value that corresponds to 99​% confidence. Assume 16 degrees of freedom. nothing ​(Round to three decimal places as​ needed.)

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