Find the appropriate rejection regions for the large-sample test statisticzin these cases.

(a) A left-tailed test at the1% significance level. (Round your answers to two decimal places. If the test is one-tailed, enter NONE for the unused region.)

z>

z <

(b) A two-tailed test with= 0.01. (Round your answers to two decimal places. If the test is one-tailed, enter NONE for the unused region.)

z >

z <

(c) Suppose that the observed value of the test statistic was

z= 2.45.

For the rejection regions constructed in parts (a) and (b), which one is the appropriate conclusion for the tests. (Enter A, B, C, or D.)

A. We do not reject the null hypothesis for part (a). The null hypothesis will be rejected at the 1% level in part (b).

B. The null hypothesis will be rejected at the 1% level in part (a). We do not reject the null hypothesis for part (b).

C. We do not reject the null hypothesis for part (a) or part (b).

D. The null hypothesis will be rejected at the 1% level in both part (a) and part (b).

(d) Suppose that the observed value of the test statistic was

z= 2.98.

For the rejection regions constructed in parts (a) and (b), which one is the appropriate conclusion for the tests. (Enter A, B, C, or D.)

A. We do not reject the null hypothesis for part (a). The null hypothesis will be rejected at the 1% level in part (b).

B. The null hypothesis will be rejected at the 1% level in part (a). We do not reject the null hypothesis for part (b).

C. We do not reject the null hypothesis for part (a) or part (b).

D. The null hypothesis will be rejected at the 1% level in both part (a) and part (b).