Question 17 (0.5 points) ? Saved Which of the following is...

Question 17 (0.5 points) ? Saved Which of the following is not true of Hare's Revised Psychopathy Checklist? It includes strong predictors of violence and recidivism in offenders and psychiatric patients It provides a reliable and valid assessment of psychopathy It is frequently used in Canadian criminal trials to determine if a defendant should be declared not criminally responsible due to a mental disorder It is widely used for research and for making decisions in the mental health and criminal justice system

Transcript

00:01 So i see that you need help with this problem, and it says the psychopathy checklist, and it is an assessment tool used to identify psychopaths with scores ranging from zero to 40.

00:13 A score of 30 or higher being indicative of psychopathy.

00:20 A forensic psychologist interested in the prevalence of psychopaths in prison administration, the pcl -r to 74.

00:30 Random prison inmates and obtained the following distribution of scores.

00:36 Convert this into a grouped frequency distribution containing of five class intervals and a determine the size of the class intervals indicate the upper and lower limits of each class interval, identify the midpoints of each class interval, and find the percentage of each class interval, find the cumulative frequency frequency for each class interval, and find the cumulative percentage of each class interval.

01:05 So what i am going to do is first the lowest score is a 15 and the highest score is a 39.

01:17 So i need to create five class intervals.

01:21 So i'm going to go from 15 to 24 and or 15 to 15 to 19 and then class.

01:34 And then class.

01:36 Intervals see how this goes 15 to 19 20 to 24 then 25 to 30 and then i have 30 to 34 and then 35 to 34 and then 35 to 39 okay and i'm going to do this in bold and i'm actually going to make this bigger and i'm going to center this all right and see i'm going to do 16 for this.

02:22 Make this bigger.

02:26 And so then it says it wants the frequency.

02:34 And then so 15 to 19 is 12.

02:40 Then i have 20 to 24, which is 10 plus plus 13 plus, so 23.

02:54 And then 25 to 30.

02:57 So 6 plus 7 plus 9 is 22 then i have 30 to 34 which is 30 to 34 is 4 plus 3 is 7 and then i have 35 to 39 which is 10.

03:30 I'm just going to add up all of these.

03:33 This is going to be in bold.

03:37 And then bold.

03:41 And then 16.

03:43 And then this is all going to be 16.

03:51 And centered.

03:55 And then i'm going to total this, auto sum this, just to make sure that i have the average, or i'm sorry, the number is correct, is 74.

04:11 Okay.

04:12 Now the next thing, so i did the class sizes of the intervals, the upper and the lower limits...

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