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Help Save & Exin A sample of 36 observations is selected from a normal population. The sample mean is 21, and the population standard deviation is 5. Conduct the following test of hypothesis using the 0.05 significance level: a. Is this a one- or two-tailed test? (Click to select) b. What is the decision rule? (Round the final answer to 3 decimal places.) (Click to select) * He and (Click to select) V , when z> c. What is the value of the test statistic? (Round the final answer to 2 decimal places.) Value of the test statistic d. What is your decision regarding Ho? Click to select) ~ He here is (Click to select) v evidence to conclude that the population mean is greater than 20