See this question Finding Critical Values and Rejection Regions In Exercises 19-24 find the critical value(s) and rejection region(s) for the type of z-test with level of significance a. Include a graph with your answer. 19. Left-tailed test, a = 0.03 20. Left-tailed test, a = 0.09 0.08 and If standard deviation is 25 for a populatio you take a sample of 25 from the population, the standard Eleviation of the Sample will be 6. True or false