JCW 2010 1

1. For the following problems, you will need to download dataset gssft.sav from the following website: http://edhd.bgsu.edu/amm/datasets.html

Address the following research problem: You are interested in evaluating the effect of gender (sex) and age (agecat4) on respondent’s income (rincom91) while controlling for hours worked per week (hrs1 ).

• Develop the appropriate research questions and/or hypotheses for the main effects and the interaction effect.
• Conduct an Analysis of Covariance (ANCOVA).
• Is factor interaction significant? Explain.
• Are main effects significant? Explain.
• Does the covariate significantly influence the dependent variable? Explain.
• What can you conclude from the effect size for each main effect?
• Write a results statement and include an ANCOVA summary table.

2. A local school district is attempting to identify the most effective instructional method to use with its learning-disabled students. They have identified two new instructional methods that they would like to compare to their existing format and are asking for your help. A total of nine students participated in this research (three students in each group). Students were administered the reading sub-test of the Wide Range Achievement Test (WRAT-A) at the beginning and end of the semester. Using the post-test score as the DV and the pre-test score as the covariate, conduct an analysis of covariance to determine whether differential treatment of learning-disabled children affects reading scores after adjusting for differences in the children’s prior reading ability.

Groups

3. A team of researchers is interested in determining whether two methods of hypnotic induction, A and B, differ with respect to their effectiveness. They begin by randomly sorting 20 volunteer subjects into two independent groups of 10 subjects each, with the aim of administering Method A to one group and Method B to the other. But then, before either of the induction methods is administered, each subject is pre-measured on a standard index of "primary suggestibility," which is a variable known to be correlated with receptivity to hypnotic induction. The dependent variable, measured during the administration of Method A or Method B, is the subject's score on a standard index of hypnotic induction. Conduct an analysis of covariance, using SPSS, to determine whether hypnotic induction method affects standard induction index scores after adjusting for "primary suggestibility." Make sure to include only appropriate SPSS output to support your answer.

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