For each of the following standardized test statistics, draw a diagram for a standard normal distribution, shade the area for the p-value, and find the p-value based on a standard normal distribution.

a) = 0.85 for a right-tailed test for a mean

b) = 2.19 for a left-tailed test for a difference in two means

c) = 1.21 for a left-tailed test for a difference in two means

d) = 12.05 for a two-tailed test for a mean