For each test statistic below, give the p value (do not round
p): a. t = 2.20, df = 15, one-tailed test
b. Z = 1.10, one-tailed test
c. t = -2.65, df = 20, two-tailed test
d. Z = -.26, two-tailed test
Solution:
a)
t = 2.20, df = 15, one-tailed test
P-value = 0.021948
b)
Z = 1.10, one-tailed test
P-value = P(Z < z )
= P(Z < 1.10 )
= 0.8643
c)
t = -2.65, df = 20, two-tailed test
P-value = 0.015366
d)
Z = -.26, two-tailed test
P-value = 2 * P(Z < z )
= 2 * P(Z < -0.26 )
= 2 * 0.3974
= 0.7948
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