Just making sure the answers are correct,

Assignment Chapter 12 Exercise 2: Exercise 4: (a) Insert H1: What is the critical F value for a sample of four observations in the numerator and seven in the denominator? Use a onetailed test and the .01 signicance level. The following hypothesis is given. Ho: 612 = 622 A random sample of ve observations from Population 1 resulted in a standard deviation of 12. A random sample of seven observations from Population 2 showed a standard deviation of 7. At the .01 signicance level, is the variation really different? (b) RejectH when (c) (cd Ho 1s (6) Exercise 6: A stockholder at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of3.9 percent. The mean rate of return on a sample of8 utility stocks was 10.9 percent with a standard deviation of 3.5 percent. A the .05 signicance level, can we conclude that the variations are different? (a) (b) RejectoHo when (c) ((1) Ho 1s (9)