Although there are many treatments for bulimia nervosa, some subjects fail to benefit from treatment. In a study to determine which factors predict who will benefit from treatment, an article indicates that self- esteem was one of these important predictors. The table gives the mean and standard deviation of self-esteem scores prior to treatment, at posttreatment, and during a follow-up. Pretreatment Posttreatment Follow-up Sample mean x 20.5 26.4 28.1 Standard deviation s 4.9 7.1 9.8 Sample size n 22 20 23 (a) Use a test of hypothesis to determine whether there is sufficient evidence to conclude that the true pretreatment mean is less than 24. (Use a = 0.05. Round your answers to three decimal places.) 1-2. Null and alternative hypotheses: OH: u 24 O Ho: M = 24 versus Ha: H t 0 O H0: (H1 7 H2) 0versus Ha: (ill a #23 : 0 O H010:l :12) : 0 versus Ha: (-\"1 #2) E t