Please need answers quick

11. Suppose your boss makes a statement that American children study more hours per week than Brazilian children. You think American children study less. You do some research and find that a sample of 41 American children study an average of 6 hours per week and a sample of 31 Brazilian children study and average of 8.5 hours per week. The standard deviation for the American children is 4.2 hours and the standard deviation for the Brazilian children is 3.4 hours. Do only the Zcalc for this hypothesis test. Use #13's informants how you feel the average is less than 65 poun 12. Using the information from the Problem #11, what if your boss says that Brazilian children have a larger variance in their study time, than American children. Do the Fcalc for this problem. Hint: This problem is called analysis of variance (ANOVA). lecture, anti Stution, Do you rojeel