For a t-curve with df = 18, obtain the t-value and illustrate your results graphically.

a. The t-value having area 0.025 to its right

b. t0.05

c. The t-value having area 0.10 to its left

d. The two t-values that divide the area under the curve into a middle 0.99 area and two outside 0.005 areas Applying the Concepts and Skills