To assist parents whose children have been diagnosed as having the eating disorder anorexia nervosa, one study evaluated the impact of a program designed to provide parents access to information and support groups (Carlton & Pyle, 2007). At the end of the program, parents who participated in the program (N = 29)

and a group of parents of children with anorexia who did not participate (N = 53) completed a survey asking them to what extent they know what to feed their child at home (the higher the score, the higher the level of knowledge). The researchers reported the following descriptive statistics: participated (M = 4.68, s = 1.57) and did not participate (M = 2.77, s = 2.02).

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a. State the null and alternative hypotheses (Ho and H). b. Make a decision about the null hypothesis. (1) Calculate the degrees of freedom (df). (2) For = .05 (two-tailed), identify the critical values and state a decision rule. (3) Calculate a value for the t-test for independent means (when calculating the standard error of the difference (SX-x), be sure to use the formula for unequal sample sizes). (4) Make a decision whether to reject the null hypothesis. (5) Determine the level of significance. c. Draw a conclusion from the analysis. d. What conclusions might the researchers draw regarding the impact of the program on parents' knowledge of anorexia nervosa?