These scores are from a PCL-R scores from a psychopathy checklist. Specifically,

Question

These scores are from a PCL-R scores from a psychopathy checklist. Specifically, these scores come from a prison population, from a research study that investigated those with psychopathy in this population. You will use the following set of scores from this population to answer the following questions: 30 33 11 24 29 17 25 24 17 26 es 24 34 6 24 rence 31 21 15 30 12 28 33 25 30 Type all your answers into a Word document or PDF and upload them to this assignment on ICON. Some of these questions may seem a little tricky. If you're confused, come to office hours and we'll work through things together! 1. Find the mean and standard deviation for the PCL-R Total Score in this data set. 2. Using these values, figure out what cutoffs (i.e. what are the PCL-R values that would be the cutoffs) we would use if we wanted to exclude scores that are more than 3 standard deviations away from the mean. Use z-scores, which you'l compute using the mean and standard deviation you just found. 3. The PCL-R has a clinical threshold of 30 as the cutoff for a psychopathy diagnosis (e.g. only those with a score of 30 or higher are labeled psychopathic, but some research uses a cutoff of 25 instead. Using the mean and standard deviation you computed, what proportion of this population surpasses the clinical cutoff of 30? What proportion surpasses the research cutoff of 25? Why do you think the research approach uses the lower cutoff? 4. A prison decides to administer a novel treatment to some of the inmates who are relatively high on the psychopathy scale. However, budget limitations mean that they can only afford to give this treatment to a small subset of those who might qualify. They decide they can give the treatment to 10% of the prisoners. They only want to include those above the clinical cutoff of 30, but lowest 10% of prisoners that have scores above 30? That is, find the score such that the proportion of prisoners between 30 and that score is 10% they don't want the most extreme cases. What PCL-R score should they use to find the of the population. Drawing a picture will greatly help with this one

Explanation / Answer

Standard Deviation of PCL-R score = 7.232335

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