Refer to the following for questions 6-10. A study was conducted to investigate the effectiveness of meditation on cortisol levels. Results for the 10, randomly selected, subjects are below. Measurements are in mcg/dL. 1 2 3 4 5 6 7 8 9 10 Before 22 18 27 8 10 17 19 25 22 20 After 17 16 20 3 6 15 11 22 18 19 At the 0.05 level, test the claim that cortisol levels are lower after meditation 6. What is the null hypothesis? a. Ha 0 C. Ha 2 0 d. Ha SO e. Ma = 0 7. What are the mean and standard deviation of the differences? a. 3.8, 6.3 -4.1, 2.233 c. 2.9, 5.2 d. 4.7, 2.6 e. 3.2, 4.1 8. What is the critical value? a. -2.6 b. 5.4 C . 3 .83 d. 6.12 e. -1.83 9. What is the test statistic? a. 6.12 b. -5.80 6.25 d. 4.76 e. 3.33 10. Does meditation help reduce cortisol levels