Problem Set 1: Pearson Correlation Coefficient Analysis
Research Scenario: A neuropsychologist is examining the relationship between two measures of cognitive functioning in a sample of 14 patients being assessed for dementia. One is the Trail Making Test- Part A (TMT) (Reitan, 1958), which measures the time (in seconds) it takes for patients to complete a connect-the-dots-style task. A longer time to complete the task indicates more cognitive impairment. The other is the Mini-Mental State Exam (MMSE) (Folstein et al., 1975), which assess a patient’s ability to perform common mental tasks. Higher scores indicate better cognitive functioning. The scores are listed in the table below.
Using this table, enter the data into a new SPSS data file and run a Pearson correlation coefficient analysis to test whether there is a relationship between scores on the TMT and the MMSE in patients being assessed for dementia. Create a scatterplot to display the relationship between the variables. Follow the directions below the table to complete the homework.
|
TMT Score (in seconds)
|
MMSE Score |
| 56 | 25 |
| 98 | 18 |
| 89 | 18 |
| 104 | 7 |
| 87 | 15 |
| 145 | 12 |
| 64 | 28 |
| 70 | 24 |
| 89 | 16 |
| 73 | 20 |
| 76 | 14 |
| 137 | 9 |
| 98 | 15 |
| 52 | 23 |
Problem Set 2: Pearson Correlation Coefficient Analysis
Research Scenario: To investigate the relationship between a person’s commute time to work and general life stress, a health psychologist interviewed people about the time they spend in their daily commute to work (in minutes) and had them fill out the Perceived Stress Scale (PSS) (http://www.macses.ucsf.edu/research/psychosocial/pss10.php), with scores ranging from 0 (no perceived stress) to 10 (high perceived stress).
Using this table, enter the data into a new SPSS data file and run a Pearson correlation coefficient analysis to test whether there is a relationship between time spent commuting and perceived stress. Create a scatterplot to display the relationship between the variables. Follow the directions below the table to complete the homework.
| Time Spent Commuting to Work (mins.)
|
PSS® Stress Score |
| 80
20 35 15 20 28 15 20 18 65 50 30 45 |
6
3 5 1 3 4 3 7 5 9 8 4 6 |
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