Problem Set 2: Linear Regression Analysis
Research Scenario: A social psychologist is interested in whether the number of days spent in a refugee camp predicts trauma levels in recently resettled refugees. He interviews 17 refugees to determine how many days they spent in a refugee camp before being resettled, then administers the Harvard Trauma Questionnaire Part IV (HTQ Part 4), where a higher score indicates higher levels of trauma (Mollica et al., 1992). He compiles the information in the table below.
Using this table, enter the data into a new SPSS data file and run a linear regression analysis to test whether days in a refugee camp predict HTQ-4 scores. Create a scatterplot with a regression line to show the relationship between the variables.
Days Spent in Refugee Camp |
HTQ Part 4 Score |
12 |
0.4 |
73 |
1.1 |
60 |
0.9 |
105 |
2.3 |
98 |
1.7 |
76 |
0.3 |
89 |
0.7 |
173 |
2.6 |
189 |
3.1 |
203 |
3.0 |
138 |
1.9 |
215 |
2.5 |
71 |
0.7 |
67 |
1.2 |
63 |
1.8 |
184 |
2.9 |
63 |
0.6 |
The regression equation is
Y=0.079+0.014X
R-squared= 77.7% Thst mean this equation explains 77.7% variation in the y variable.
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