A researcher records the test scores of 10 students:
Student | Score |
|---|---|
1 | 72 |
2 | 85 |
3 | 68 |
4 | 91 |
5 | 77 |
6 | 85 |
7 | 63 |
8 | 85 |
9 | 79 |
10 | 95 |
Which of the following correctly identifies the mode and range of this data set?
Mode = 85; Range = 32
Mode = 79; Range = 32
Mode = 85; Range = 27
Mode = 80; Range = 22
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A clinical psychologist assessed eight patients diagnosed with posttraumatic stress disorder (PTSD) before and after a 12-week course of trauma-focused therapy. Symptom severity was measured using a validated 80-point scale at the start and end of treatment, where higher scores indicate more severe symptoms. The data are shown in the table below. The psychologist did not use a control group or randomly assign patients to conditions.
Patient | Pre-therapy score | Post-therapy score |
|---|---|---|
1 | 61 | 42 |
2 | 55 | 38 |
3 | 53 | 44 |
4 | 49 | 31 |
5 | 44 | 28 |
6 | 42 | 35 |
7 | 38 | 22 |
8 | 38 | 19 |
What was the mean pre-therapy symptom score across the eight patients?
38
47.5
46.5
23
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