Determine thet-value in each of the cases.

(a) Find thet-value such that the area in the right tail is 0.005 with 13 degrees of freedom.

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(Round to three decimal places asneeded.)

(b) Find thet-value such that the area in the right tail is 0.15 with 26 degrees of freedom.

__________

(Round to three decimal places asneeded.)

(c) Find thet-value such that the area left of thet-value is 0.20 with 10 degrees of freedom.[Hint: Usesymmetry.]

___________

(Round to three decimal places asneeded.)

(d) Find the criticalt-value that corresponds to 95% confidence. Assume 28 degrees of freedom.

___________

(Round to three decimal places asneeded.)