A researcher obtains z = 2.04 for a one–independent sample z-test. What is the decision for this test at a .05 level of significance? A) to reject the null hypothesis B) to retain the null hypothesis C) It depends on whether the test is one-tailed or two-tailed. D) There is not enough information to make a decision. Solution C) It depends on whether the test is one-tailed or two-tailed..