The following questions assess your understanding of concepts, logic, and process underlying the use of ANCOVA.

You have been hired as the statistical consultant by the curriculum committee at a local community college. The committee wants to examine whether the method of instructin for a remedial mathematics course helps determine the score on a standardized math competency assessment (MCAS) administered at the end of the semester. Nonetheless, in addition to the method of instruction, you believe that the students IQ score, measured prior to taking the remedial course, may be an important determinant that should be included in your analysis.

Conduct an ANCOVA (α=.05) using the data and information listed below.

1. It is important that the IQ scores were assessed prior to students enrolling in the course? Why/why not? (10pts)

2a) Paste the relevant SPSS output from a Test of homogeneity-of-slopes and briefly summarize the results in APA style. (40 pts)

2b) Based on the results of your analysis in section 2a, what is the next step in your analysis (10pts)

3. Conduct the subsequent analysis you noted in your answer to 2a, paste the relevant SPSS output, and summarize your results in APA style (70pts)

4. Plot the estimated means. Discuss their pattern in relation to the output and result you described in part 3. Discuss how the estimated means compare to the unadjusted means? (20pts)

5. Extra credit 1. Past the SPSS syntax commands you would run if you had found an interaction effect. Discuss the underlying logic behind running that analysis (20pts)

6. Extra credit 2. Assuming an interaction, display your results in a scatterplot. Interpret the results (20pts)

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Solution: The downloadable solution consists of 6 pages, 555 words and 5 charts.
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