plz solve it

Save A sample of 36 observations is selected from a normal population. The sample mean is 21, and the population standard deviation Conduct the following test of hypothesis using the 0.05 significance level: Ho : H S 20 Ha : H > 20 5:04 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) w H, 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