For a t-curve with df = 21, find each t-value, and illustrate your results graphically. a. The t-value having area 0.10 to its right b. t0.01 c. The t-value having area 0.025 to its left (Hint: A...

For a t-curve with df = 21, find each t-value, and illustrate your results graphically.

a. The t-value having area 0.10 to its right
b. t0.01
c. The t-value having area 0.025 to its left (Hint: A t-curve is symmetric about 0.)
d. The two t-values that divide the area under the curve into a middle 0.90 area and two outside areas of 0.05