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ANCOVA and Factorial ANOVA

Application ? ANCOVA and Factorial ANOVA
You will submit one Word document for this activity. You will create this Word document by cutting and
pasting SPSS output into Word.
This Activity consists of two parts. In the first part, you will utilize an existing dataset to compute a
factorial ANOVA. All SPSS output should be pasted into your Word document. In the second part, you will
be asked to create a hypothetical ANCOVA output table for variables related to your area of research
Part A. SPSS Activity
The ?Activity 5.sav? file contains a dataset of a researcher interested in finding the best way to educate
elementary age children in mathematics. In particular, she believes that 5th grade girls do better in
small class sizes while boys excel in larger classes. Through the school district, she has arranged a pilot
program in which some classroom sizes are reduced prior to the state-wide mathematics competency
assessment. In the dataset, you will find the following variables:
Participant: unique identifier
Gender: Male (M) or Female (F)
Small (1) ? no more than 10 children
Medium (2) ? between 11 and 19 children
Large (3) ? 20 or more children
Score: final score on the statewide competency assessment.
To complete this Activity
1. Exploratory Data Analysis.
a. Perform exploratory data analysis on all variables in the data set. Realizing that you have six groups,
be sure that your exploratory analysis is broken down by group. When possible, include appropriate
graphs to help illustrate the dataset.
b. Compose a one to two paragraph write up of the data.
c. Create an APA style table that presents descriptive statistics for the sample.
2. Factorial ANOVA. Perform a factorial ANOVA using the ?Activity 5.sav? data set.
a. Is there a main effect of gender? If so, explain the effect. Use post hoc tests when necessary or explain
why they are not required in this specific case.
b. Is there a main effect of classroom size? If so, explain the effect. Use post hoc tests when necessary
or explain why they are not required in this specific case.
c. Is there an interaction between your two variables? If so, using post hoc tests, describe these
d. Is there support for the researcher?s hypothesis that girls would do better than boys in classrooms
with fewer students? Explain your answer.
e. Write up the results in APA style and interpret them. Be sure that you discuss both main effects and
the presence/absence of an interaction between the two.
Part B. Applying Analytical Strategies to an Area of Research Interest
3. Briefly restate your research area of interest.
Analysis of Covariance. Using your area of interest, identify one independent and two dependent
variables, such that the dependent variables would likely be covariates. Now, assume you conducted an
ANCOVA that shows both the independent variable as well as the covariate significantly predicts the
dependent variable. Create a mock ANCOVA output table (see SPSS Output 11.3 in your text for an
example) that supports the relationship shown above.

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