As you have learned this week, ANCOVA can be a valuable tool in research design. For this Application, you will use ANCOVA to analyze data from a research study. To prepare for this Application: •Review Chapter 12 of the Field text for a description of the analysis of covariance and an example of conducting an analysis of covariance using PASW. •Review Chapter 5 from the APA manual, “Displaying Results.” •Review the media about conducting an ANCOVA. •Read the research study below.
As you have learned this week, ANCOVA can be a valuable tool in
research design. For this Application, you will use ANCOVA to analyze
data from a research study.
To prepare for this Application:
•Review Chapter 12 of the Field text for a description of the analysis of covariance and an example of conducting an analysis of covariance using PASW. •Review Chapter 5 from the APA manual, “Displaying Results.” •Review the media about conducting an ANCOVA. •Read the research study below.
RESEARCH STUDY: Stalking is a very disruptive and upsetting experience in which someone (the stalker) constantly harasses or obsesses about another person. Stalking can take many forms, from sending intensely disturbing letters to literally following you around in the places where you live and socialize. A psychologist decides to try two different therapies on people who reported a history of stalking and reported currently exhibiting stalking behaviors (25 stalkers in each group; this is the Group variable in the data set Stalker.sav). With those in group one, the psychologist used a cognitive-behavioral approach. With those in the second group, she used a psychodynamic approach. At the end of 3 months, the psychologist asked the clients to report on the number of hours each week they engaged in stalking-type behaviors (this variable is called Stalk2 in the data set). The psychologist understands about covariance and believes that success of the therapy will likely depend on how bad the behavior was to begin with, so she asked the clients to report at their first session the number of hours that the client engaged in stalking-type behaviors (this variable is called Stalk1 in the data set).
The assignment:
Following the example in the text outlined on pp. 490–493, analyze the effect of the therapies on stalking-type behaviors after therapy ended while controlling for initial number of hours of stalking-type behaviors.
Report your findings in APA format according to the guidelines in the PASW Application Assignment Guidelines handout. The final document should be 2–3 pages long.
Grading Rubic – Must Follow Week 5: ANCOVA 50-pt Weight
Graded Elements
null and alternative hypotheses 4 pts.
statistical assumption: IV-COV independence 1 Pt.
statistical assumption: homogeneity reg slope 1 Pt.
statistical assumption: homogeneity of variance 1 Pt.
results: descriptives 8.3 Pts.
results main effect: covariate 8.3 Pts.
results main effect: group 8.4 Pts.
APA table: means and SD for DV and COV 1.6 Pt.s
APA table: adjusted means (EMM) for DV 1.7 pts.
APA table: ANCOVA summary 1.7 Pts.
APA style results write up 5 Pts.
SPSS syntax and output 8 pts
To prepare for this Application:
•Review Chapter 12 of the Field text for a description of the analysis of covariance and an example of conducting an analysis of covariance using PASW. •Review Chapter 5 from the APA manual, “Displaying Results.” •Review the media about conducting an ANCOVA. •Read the research study below.
RESEARCH STUDY: Stalking is a very disruptive and upsetting experience in which someone (the stalker) constantly harasses or obsesses about another person. Stalking can take many forms, from sending intensely disturbing letters to literally following you around in the places where you live and socialize. A psychologist decides to try two different therapies on people who reported a history of stalking and reported currently exhibiting stalking behaviors (25 stalkers in each group; this is the Group variable in the data set Stalker.sav). With those in group one, the psychologist used a cognitive-behavioral approach. With those in the second group, she used a psychodynamic approach. At the end of 3 months, the psychologist asked the clients to report on the number of hours each week they engaged in stalking-type behaviors (this variable is called Stalk2 in the data set). The psychologist understands about covariance and believes that success of the therapy will likely depend on how bad the behavior was to begin with, so she asked the clients to report at their first session the number of hours that the client engaged in stalking-type behaviors (this variable is called Stalk1 in the data set).
The assignment:
Following the example in the text outlined on pp. 490–493, analyze the effect of the therapies on stalking-type behaviors after therapy ended while controlling for initial number of hours of stalking-type behaviors.
Report your findings in APA format according to the guidelines in the PASW Application Assignment Guidelines handout. The final document should be 2–3 pages long.
Grading Rubic – Must Follow Week 5: ANCOVA 50-pt Weight
Graded Elements
null and alternative hypotheses 4 pts.
statistical assumption: IV-COV independence 1 Pt.
statistical assumption: homogeneity reg slope 1 Pt.
statistical assumption: homogeneity of variance 1 Pt.
results: descriptives 8.3 Pts.
results main effect: covariate 8.3 Pts.
results main effect: group 8.4 Pts.
APA table: means and SD for DV and COV 1.6 Pt.s
APA table: adjusted means (EMM) for DV 1.7 pts.
APA table: ANCOVA summary 1.7 Pts.
APA style results write up 5 Pts.
SPSS syntax and output 8 pts
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