PSYC 355 SPSS HOMEWORK 5 INSTRUCTIONS: CORRELATION Part 1: Green & Salkind: Lesson 31 - Exercises 1, 3-4 The following helpful tips are numbered to correspond with the exercise number to which they refer (dashes indicate no tips are needed): 1. Paste the output. (2 pts) Instead of answering a-c from the text, answer the following questions in their place: (2 pts each) a. What is the correlation (r value) between number of articles published and overall quality of the instructor? b. Is there a significant correlation between overall course quality and overall quality as an instructor? Include the r and p values to support your answer. c. Of all the correlations, which is the only non-significant one? 3. Write your Results section focusing on the following 2 correlations: a) number of publications with number of times cited by other authors, and b) number of publications with overall course quality. All homework Results sections must follow the example given in the Course Content document \"Writing Results of Statistical Tests in Current APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. For a correlation analysis, be sure to also include the direction of the relationship between the variables (positive? negative? none?) in your section. (3 pts) 4. -------- (3 pts) Part 2: 1. An organizational psychologist would like to determine whether there is a relationship between managers' evaluations of employees and peer evaluations of the same employees. He is specifically interested in evaluations of leadership potential (L.P.). He collects manager and peer evaluations of the leadership potential of 28 employees. Higher scores indicate higher ratings of leadership potential, and the scores for both ratings can range from 1 to 16. These scores are listed in the table below. Conduct a Pearson correlation coefficient analysis to determine whether there is a relationship between the manager and peer evaluations for this group of employees. The steps will be the same as the ones you have been practicing in Part 1 of the assignmentthe only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the \"Variable View,\" then return to the \"Data View\" to enter the data. Page 1 of 5 PSYC 355 Manager Rating of L.P. 6 3 5 13 8 6 5 8 3 4 2 2 6 10 7 12 1 5 3 9 5 8 7 4 3 9 5 3 Peer Rating of L.P. 9 4 7 14 11 8 6 9 6 5 3 2 9 12 10 15 2 7 5 11 4 7 9 8 4 9 7 3 a) Paste the SPSS output. (2 pts) b) Create a simple scatterplot of the relationship between these variables (define peer ratings as the x-axis and manager ratings as the y-axis). (2 pts) c) Write a current APA-style Results section based on your analyses. All homework Results sections must follow the example given in the SPSS tutorials and the Course Content document \"Writing Results of Statistical Tests in Current APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. For a correlation analysis, be sure to also include the direction of the relationship between the variables (positive? negative? none?) in your section. (2 pts) Page 2 of 5 PSYC 355 2. To investigate the relationship between a person's commute time to work and general life stress, a health psychologist interviewed people about the time they spend in their daily commute to work (in minutes) and had them fill out the Perceived Stress Scale (PSS) (http://www.macses.ucsf.edu/research/psychosocial/pss10.php), with scores ranging from 0 (no perceived stress) to 10 (high perceived stress). Conduct a Pearson correlation coefficient analysis to determine whether there is a relationship between the time spent commuting and perceived stress in this sample. The steps will be the same as the ones you have been practicing in Part 1 of the assignmentthe only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the \"Variable View,\" then return to the \"Data View\" to enter the data. Time Spent Commuting to Work (mins.) 47 19 35 15 20 15 13 19 18 50 65 30 40 PSS Stress Score 6 3 5 2 3 4 3 7 5 9 8 4 6 a) Paste the SPSS output. (2 pts) b) Create a simple scatterplot of the relationship between these variables. (2 pts) c) Write a current APA-style Results section based on your analyses. All homework Results sections must follow the example given in the SPSS tutorials and the Course Content document \"Writing Results of Statistical Tests in Current APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. For a correlation analysis, be sure to also include the direction of the relationship between the variables (positive? negative? none?) in your section. (2 pts) Page 3 of 5 PSYC 355 Part 3: Cumulative Homework 1. A sports psychologist is studying the effects of head trauma on short-term memory in a group of 15 college football players. Specifically, she hypothesizes that players who have experienced head trauma will have lower scores on a short-term memory task than the general population of male college students. She administers an instrument to assess short-term memory to the players in the sample, all of whom have experienced some sort of football-related head trauma. The mean score for male college students on the instrument is 22, and the possible range of scores is 0-30. The scores are recorded in the table below. Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under the table below. ST Memory Scores 18 17 22 24 19 12 15 15 14 18 9 25 7 18 20 a) Paste the appropriate SPSS output. (3 pts) b) Paste the appropriate SPSS graph. (2 pts) c) Write a current APA-style Results section based on your analyses. All homework Results sections must follow the example given in the SPSS tutorials and the Course Content document \"Writing Results of Statistical Tests in Current APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. (3 pts) Page 4 of 5 PSYC 355 2. A community psychologist is interested in whether signs containing encouraging messages or warning messages are more effective in increasing the vaccination rate in inner-city clinics. He chooses 2 clinics with similar numbers of child patients of similar ages. He posts encouraging-type signs in one clinic and warning-type signs in another and records the number of vaccinations per week over a period of 10 weeks. Is there a significant difference between the groups based on the type of sign? Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under the table below. Encouraging Signs Warning Signs 12 9 7 18 11 14 20 5 6 14 9 8 11 12 19 20 12 3 5 8 a) Paste the appropriate SPSS output. (2 pts) b) Paste the appropriate SPSS graph. (2 pts) c) Write a current APA-style Results section based on your analyses. All homework Results sections must follow the example given in the SPSS tutorials and the Course Content document \"Writing Results of Statistical Tests in Current APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. (2 pts) This assignment is due by 11:59 p.m. (ET) on Monday of Module/Week 5. Page 5 of 5