Using Table G, find the critical value(s) for each, show the critical and noncritical regions, and state the appropriate null and alternative hypotheses. Use σ² = 225.

a. α = 0.05, n = 18, right-tailed

b. α = 0.10, n = 23, left-tailed

c. α = 0.05, n = 15, two-tailed

d. α = 0.10, n = 8, two-tailed

e. α = 0.01, n = 17, right-tailed

f. α = 0.025, n = 20, left-tailed

g. α = 0.01, n = 13, two-tailed

h. α = 0.025, n = 29, left-tailed