19. The average number of students in each class who are using google classroom was found to be 27 with a standard deviation of 5 If a random sample 6 classes were taken, find the probability that the mean is between 21 and 32. A. 0.4984 C. 0.9913 B. 0.4929 D. 0.0055 20. If the computed z-value is 2.05 and the critical value is 1.63, which of the following statements could be true? A. It lies in the rejection region, Ho must be rejected. B. It lies in the rejection region, we failed to reject Ho. C. It lies in the non-rejection region, Ho must be rejected. D. It lies in the non-rejection region, we failed to reject Ho. 21. If the computed z-value is - 1.87 and the critical value is - 2.53, which of the following statements could be true? A. It lies in the rejection region, Ho must be rejected. B. It lies in the rejection region, we failed to reject Ho. C. It lies in the non-rejection region, Ho must be rejected. D. It lies in the non-rejection region, we failed to reject Ho. 22. Which of the following population parameters is used as symbol for the mean or average population? A. o C. P B. H D. x 23. Which of the following statements best describes a parameter? A. It describes the sample. B. It describes the researcher. C. It describes the hypothesis D. It describes the population 24. A researcher estimates that the average height of plants in a certain orchard is at least 12 inches. Based on the given data, which is the parameter? A. the researcher C. plants in the orchard B. at least 12 inches D. the average height plants