# Psychology Statistics

Psychology Statistics

Instructions: The sample of data below   represent n = 15 observations of psychological stress test score data.   The   higher the value the more stress is measured in a sample of college   students.      Look at the data   carefully.         Show   all work and provide interpretations to responses just as we have done in   class.      Place   all of your answers in the Empty YELLOW cells. Show all necessasry work.

## Version 01

 PSYC 315 Exam 1 – Spring 2021 Worth 182 points Instructions: The sample of data below represent n = 15 observations of psychological stress test score data. The higher the value the more stress is measured in a sample of college students. Look at the data carefully. Show all work and provide interpretations to responses just as we have done in class. Place all of your answers in the Empty YELLOW cells. Show all necessasry work. Problem 1. (82 points) case ## value Calculate the Coefficient of Variation and Determine if there are any OUTLIERS. Case 01 7 Also find the Xp80 . Case 02 24 Also find the PR(X = 44) Case 03 44 Case 04 46 Points Case 05 67 1 pt. Find n = Case 06 95 3 pts. Find sumX = Case 07 113 5 pts. Find sumXX = Case 08 116 Case 09 132 4 pts. Find average = Case 10 135 8 pts. Find std dev = Case 11 153 5 pts. Find the CV = Case 12 154 Case 13 162 6 pts. Find Xp80 = Case 14 194 6 pts. Find PR(X = 44) = Case 15 400 points lost Check for Outliers points possible Post the steps here as we did in class. points earned 5 pts. Xp25= percentage earned 5 pts. Xp75= 4 pts. IQR= 2 pts. 1.5(IQR) = 6 pts. LLOB = 6 pts. ULOB = 5 pts. Are there any LLO? 5 pts. Are there any ULO? 6 pts. Concluding Remarks. Problem 2. (80 points) Construct and Display a Bar Chart, a Pareto Chart and a Pie Chart using the following categorical frequency data of young urban adults who identify themselves as suffering from one of the six psychological disorders. Problems Frequency Rel Freq 1) Anxiety Disorders 9 2) Depressive Disorders 6 3) Eating Disorders 15 4) Bipolar Disorders 13 5) Schizophrenia Disorders 8 6) Post Traumatic Stress Disorders 13 Total 64 Problem 3. (20 points) Look at the data and determine if the data distribution is approximately positively skewed, negatively skewed or symmetric. Remember the rules: If the mean is less than the median is less than the mode, then the data are approximately negatively skewed. If the mode is less than the median is less than the mean, then the data are approximately positively skewed. if the mean, the median and the mode are approximately equal, then the data are approximately symmetric. case ## value case 001 9 mean (5 pts) case 002 47 median (5 pts) case 003 50 mode (5 pts) case 004 57 decision (5 pts) case 005 61 case 006 66 case 007 67 case 008 69 case 009 71 case 010 71 case 011 73 case 012 73 case 013 73 case 014 84 case 015 85 case 016 94 case 017 97

Problems

1) Anxiety Disorders 2) Depressive Disorders 3) Eating Disorders 4) Bipolar Disorders 5) Schizophrenia Disorders 6) Post Traumatic Stress Disorders 9 6 15 13 8 13

Problems

Frequency