The following graph portrays the decision criterion for a onemean z-test, using the critical-value approach to hypothesis testing.

The curve in the graph is the normal curve for the test statistic under the assumption that the null hypothesis is true.

0 z 1.28 Do not reject H0 0.10 Reject H0 Determine the

a. rejection region.

b. nonrejection region.

c. critical value(s).

d. significance level.

e. Draw a graph that depicts the answers that you obtained in parts (a)–(d).

f. Classify the hypothesis test as two tailed, left tailed, or right tailed.