Earlier in this chapter, a study was described examining males’ concerns regarding oral contraceptives

(Jaccard et al., 1981). The study hypothesized that males would rate risks to their health as more important to them than either the contraceptive’s effectiveness or convenience. Below is the ANOVA summary table for the study:

To test one of the study’s research hypotheses, you conduct a planned comparison of Health Risks (N = 9, M = 4.51) versus Effectiveness (N = 9, M = 3.18). Complete the following steps for this planned comparison.

a. State the null and alternative hypotheses (H₀ and H₁).

b. Make a decision about the null hypothesis.

(1) Calculate the degrees of freedom (df).

(2) Set alpha (α), identify the critical value, and state a decision rule.

(3) Calculate the F-ratio for an analytical comparison (F_comp).

(4) Make a decision whether to reject the null hypothesis.

(5) Determine the level of significance.

(6) Calculate a measure of effect size (R_comp)

c. Draw a conclusion from the analysis.

d. Relate the result of the analysis to the research hypothesis.

Transcribed Image Text:

Source SS df MS F 9.00 2 4.50 3.54 Aspect of contraception Error Total 30.56 24 1.27 39.56 26