Interaction_Problems

Interaction_Problems - Psyc 310 Fall 2008 Dr. Bianco...

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Psyc 310 –Fall 2008 – Dr. Bianco Interaction Problems 1. A grade school teacher and her colleagues are discussing a new workbook they will be adopting to improve math grades. They are debating whether it is better for the students to do the workbook exercises at home or during class. Some of the teachers feel that the benefits of the workbook will depend on whether the students have weak or strong math skills to begin with. You have been recruited to design an experiment to shed light on the matter. What is the correct name and notation for this type of factorial experiment? This is a combined 2x2 factorial design Identify the factors and levels present in the experiment. Factor A = where workbook is completed; levels = home or in class Factor B = students’ original math skills; levels = weak or strong Identify all IVs and DVs. IVs = where workbook is completed + students’ original math skills DV = math grades Identify the main effects and interactions you will be examining in this study. Main effect for where workbook is completed (A) Main effect for students’ original math skills (B) Interaction between where workbook is completed and students’ original math skills (AxB) List the hypotheses you will be testing in this experiment: 1. Where workbook is completed does not affect math grades 2. Students’ original math skills do not affect math grades 3. The effect of where the workbook is completed on math grades does not depend on students’ original math skills. Draw a matrix representing this study: Factor A Factor B Class Home Weak Class/weak Home/weak Strong Class/strong Home/strong
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Draw a graph representing the following results, and interpret your findings: There is a main effect for where the workbook is completed (Factor A) There is a main effect for students’ original math skills (Factor B) There is an interaction between where the workbook is completed and students’ original math skills (AxB) Interpretation: Overall, students get higher math grades when they did the workbook in class rather than at home. Overall, students with strong math skills got higher grades.
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This note was uploaded on 04/29/2010 for the course PSYCH 310 taught by Professor T.bianco during the Winter '10 term at Concordia Canada.

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Interaction_Problems - Psyc 310 Fall 2008 Dr. Bianco...

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