Data Analysis Assignment 1 - Spring B 2023

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Psychology

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Apr 3, 2024

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PSY514 Spring B 2023 M1 Data Analysis Assignment (30 points total) Instructions – READ CAREFULLY Complete the assignment in this Word document. When you are finished, you will submit your answers directly into the M1 Data Analysis Assignment “Quiz.” You will use a drop-down menu to select the answers you’ve provided in this document. This real-world data was collected from a group of forensic practitioners. The questionnaire included questions about the number of years employed as a forensic practitioner, highest grade level of education achieved, gender, and whether they have ever testified in court to a latent fingerprint identification (among others we will not analyze for this assignment). Examine a data set and categorize the variables (3 points) Forensic practitioners were asked the following survey questions. Identify the level of measurement for each variable. Your options are nominal, ordinal, or scale. Question 1A. What is the total number of years you have been employed as a forensic practitioner? Forensic practitioners inserted a numerical value (Column F). (1) Level of Measurement: ______Scale________ Question 1B. What is the highest level of education achieved? Forensic practitioners selected Associates, Bachelors, Masters, or Doctoral (Columns H-K). Hint: There is a meaningful difference between these categories. (1) Level of Measurement: _____Ordinal_________ Question 1C. Have you ever testified in court to a latent fingerprint identification? Forensic practitioners selected Yes or No (Column G). (1) Level of Measurement: _____Nominal_________ Identifying dependent variable and independent variable in a research question (2 points) Based on the M1 data set #1, data analysis can be performed to answer the following research questions. For each question, identify the dependent variable (DV) and independent variable (IV). Question 2A. Is there a significant difference in the amount of times that males and females have testified in court? (1) Dependent variable: _____Number of times the person has testified in court_____________ Independent variable: ___Male or Female (sex)______________ Question 2B. Does testifying in court vary between people with different education levels? (1) Dependent variable: ______performance while testifying____________ Independent variable: _______education level__________

PSY514 Spring B 2023 Identify the sample and target population of a research study (2 points) A psychology graduate student wanted to do a research project on the relationship between forensic examiners’ experience in trial testimony and convictions. To collect data, he recruited participants in Phoenix who were forensic examiners and willing to answer a few survey questions and to provide a copy of their court testimonies. The student collected data from 65 forensic examiners, including 35 women and 30 men. Question 3A. Which of the following is the sample of the study? (1) - All forensic examiners - All Phoenix forensic examiners - The 65 forensic examiners who participated Question 3B. Which of the following is the target population of the study? (1) - All forensic examiners - All Phoenix forensic examiners - The 65 forensic examiners who participated Z-score and Z distribution (8 points) Note: SPSS is not needed for this question set. All the data are contained in the questions. Use the following information to answer Questions 4-10. Risk assessments are sometimes used in court to determine a person’s risk of violence and recidivism. A judge ordered a risk assessment for a convicted violent offender to advise in sentencing. The defense and prosecution each hired a clinical forensic psychologist to conduct a risk assessment, and the judge wants to know how these psychologist’s assessments compare. The problem is, they used two different assessment instruments. In order to figure out how the assessments compare, the judge decides to calculate the Z scores of each assessment score relative to nationwide assessment data. Question 4. The defense’s expert gave a risk assessment score of 16. The nationwide scores for this particular assessment have a mean of 20 points and a standard deviation of 4 points. What is this expert’s Z score? (1) -1 Question 5. The prosecution’s expert gave a risk assessment score of 30. The nationwide scores for this particular assessment have a mean of 25 points and a standard deviation of 2.5 points. What is this expert’s Z score? (1) 2 Question 6. Did the defense’s or prosecution’s expert (from Q4 and Q5) report that the offender was a higher risk (higher score = higher risk)? How did you know? (2) High risk the z score for prosecution expert was higher so prosecution expert is chosen Question 7. Once the distributions from the two assessments are converted into Z distributions, the two expert’s scores can be located on the same Z distribution to see their relative positions. How many standard deviations separate their positions?

PSY514 Spring B 2023 3 Question 8. A third-party psychologist used the same assessment instruments as the defense expert (from Q4) to determine that an offender had a risk score of 24. Recall that the nationwide scores on this particular assessment have a mean of 20 points and a standard deviation of 4 points. How many standard deviations separate this third-party psychologist’s score and the defense expert’s score of 16 in the distribution? (1) 2 Question 9. What percentage of scores fall between the risk assessment scores of the defense expert and the third-party psychologist? (1) 68.27 Question 10. If 500 psychologists use the same risk assessment instruments as the defense expert, how many of them will provide risk scores lower than the defense expert’s score? (1) All 500 Psychologists Data Analysis: Frequencies (9 points) Download the data set from Canvas and open it in SPSS. 11. Create a frequency table. (2) In the survey, the forensic practitioners indicated whether they have ever testified in court to a latent fingerprint identification (Yes/No). Run a frequency table to determine how many forensic practitioners have testified in court. Fill in the frequency column and percent column for the testified variable. (.5 point per cell) Testified? Frequency Percent No 306 72.0 Yes 119 28.0 12. Create another frequency table for the age variable. This variable was coded such that 3 = 30-39 years old. What is the percentage of forensic practitioners who are 30-39 years old? (2) 36.7% 13. Create another frequency table for the gender variable. What is the percentage of forensic practitioners who are female? (2) 53.6 14. Run frequency statistics for the years_employed variable. After moving over the variable, click on “Statistics…” in the upper-right hand corner. Request that the output include the mean, median and standard deviation and provide these values below: (3) Mean = __10.61__

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