Part One: Note: For the two-way ANOVA, you will be expected to create a line graph as covered in the SPSS tutorial in the Course Content (and not a boxplot as in the textbook). This applies to future cumulative questions as well.
Problem Set 1: The Two-way ANOVA
File: Open “Module 4 Exercise File 1” found in Blackboard Course Content (Course Guides and Assignment Instructions—Assignment Instructions—SPSS Homework—SPSS Homework 4 Files).
Research Scenario: Because low birth weight contributes to health issues later on, a pregnancy center wants to educate mothers about the effects of smoking and not eating well during pregnancy on the birth weight of the baby. They gather data from local hospitals, including whether or not the mother smokes, whether or not she has a history of diet-related hypertension, and the eventual birth weight of the baby. Run a two-way ANOVA to determine whether birthweight differs as a function of smoking or hypertension in the mother. |
Part Two:
Problem Set 1: The Two-Way ANOVA
Research Scenario A group of clinical psychologists sets up a treatment study to look at the effects of treatment type and treatment setting (community clinic or university clinic) on symptom severity in a sample of patients with diagnosed Major Depressive Disorder. They recruit 12 participants from each type of clinic (though one person eventually drops out of one group), and divide them further into two groups, one of which receives cognitive-behavioral therapy (CBT) and one of which receives psychodynamic (PD) therapy. The psychologists measure depressive symptomology using the Beck Depression Inventory (Beck et al., 1961), and scores can range from 0 to 62. Their results are in the table below. Conduct a two-way ANOVA to determine whether treatment type and/or treatment setting have an effect on the severity of depressive symptoms. |
Community Clinic |
University Clinic |
|
CBT |
36
32 19 25 27 |
31
12 27 20 29 |
PD |
24
41 38 12
|
42
21 37 53 19 |
Part Three: Cumulative Homework
Problem Set 1: Choose the correct method from tests learned in previous modules.
Research Scenario: As part of a new treatment initiative, a residential substance abuse treatment center decides to assess clients at intake with the CMRS (De Leon, 1993) to determine their readiness to enter and remain in the treatment program. The scale has possible scores up to 90, with higher scores indicating a higher likelihood of entering and staying in the residential program. Counselors want to determine whether there are differences in CMRS scores between three main groups: patients with alcohol dependency, patients with heroin dependency, and patients with cocaine or crack cocaine dependency. A preliminary sample of scores is shown below. Is there a difference in CMRS scores among these three groups? Choose the correct test, then follow the directions after the table. |
Alcohol | Heroin | Cocaine/
Crack Cocaine |
56
32 57 45 79 22 61 |
43
80 67 32 24 18 |
68
31 51 45 29 63 |