Calculate a critical z-score for a left-tailed, right-tailed, or two-tailed test.

Select the correct statement.

• a.)The critical z-score for a right-tailed test at an 18% significance level is 0.57.
• b.)The critical z-score for a left-tailed test at a 14% significance level is -1.08.
• c.)The critical z-score for a two-sided test at an 18% significance level is 1.95.
• d.)The critical z-score for a two-sided test at a 10% significance level is 1.23.