Question 4 Schizophrenia Continued _ 10 points Continue the MAO & Schizophrenia Study in Question 1 of Midterm Part 1. Recall there were 3 types. of Schizophrenia patients and we want to compare their MAO activity levels in the blood. - Q4a 5 points Suppose the true mean MAO activity levels for the 3 types of Schizophrenia patients are respectively = 9, = 6, and III = 6 and the sizes of the 3 groups are 20, 10, and 10 respectively. At the significance level of a = 0.05, calculate the power of the ANOVA test for this situation if the error variance is around 3 = 9. Please show your calculation and R codes if any. Q4b 5 points Suppose the 3 groups are equal in size. Find the minimal number of subjects in each group required to achieve a power of 0.8. assuming the true means for the 3 groups are |1=9, II = 6, and III = 6, for an ANOVA test at a significance level of 0.05? Please show your calculation and R codes if any.