PSYC 355 SPSS HOMEWORK 6 INSTRUCTIONS PREDICTION - BIVARIATE LINEAR REGRESSION Part 1: Note: You will use raw data for all homework exercises with no need to convert to z scores. Green & Salkind: Lesson 33 Exercise Open Lesson 33 Exercise File 1 found in Blackboard Course content (under Syllabus and Assignment InstructionsAssignment InstructionsSPSS Homework 6SPSS Homework 6 FilesMod6_Lesson 33 Exercise File 1). This data set pertains to Peter's study on the number of times boys hit a doll and a peer, as described in the end of chapter exercise in Green and Salkind Lesson 33. Read the research scenario in the text, then follow the directions below as some questions have been altered. 1. Conduct a linear regression to predict the number of times a boy would strike a classmate from the number of times the boy hit a bobo doll. Use raw scores, not z scores, in the regression analysis. Paste SPSS output, then answer the following questions: Descriptive Statistics Std. Mean Deviation N Number of times hitting a 11.60 20.095 10 peer Number of times hitting a 4.90 8.048 10 bobo doll Variables Entered/Removeda Variables Variables Entered Removed Method Number of times hitting a . Enter b bobo doll Model 1 a. b. c. d. What is the value of the slope in your output? 2.322 What is the value of the additive constant? 0.221 What is the mean number of times a boy hit a classmate? 11.60 What is the correlation between hitting a doll and hitting a classmate, as given in the output? 0.93 Page 1 of 5 PSYC 355 3. Create a scatterplot of the relationship between the two variables. Plot the regression line on the graph. 4. Write a Results section based on your findings. All homework \"Results sections\" must follow the example given in the SPSS tutorial presentations and the Course Content document \"Writing Results of Statistical Tests in Current APA Format.\" Note: The statistical statement for a bivariate linear regression must include at least the equation of the line and the confidence interval for the slope (the second row under Confidence Intervals in the output), as well as a decision about the null hypothesis. A bivariate linear regression analysis was used to determine if the number of times a boy hit a bobo doll could predict the number of times the boy would hit a peer. The results of the regression indicated that hitting a bobo doll explained 86.5% of the variance in the dependent variable (number of times the boy hit a classmate). The regression model was statistically significant in predicting the outcome, F (1, 8) = 51.205, p < 0.001, R2= 0.865. Number of times hitting a bobo doll was statistically significant with a beta of 2.322 (1.574, 3071). With an increase by 1 time that the child hits a bobo doll, the number of times a child hits a peer will increase by 2.322.We reject the null hypothesis. Page 2 of 5 PSYC 355 Part 2: 1. Research scenario: A social psychologist is interested in whether the number of days spent in a refugee camp predicts trauma levels in recently resettled refugees. He interviews 17 refugees to determine how many days they spent in a refugee camp before being resettled, then administers the Harvard Trauma Questionnaire Part IV (HTQ Part 4), where a higher score indicates higher levels of trauma (Mollica et al., 1992). He compiles the information in the table below. Conduct a bivariate linear regression to analyze the research question. The steps will be the same as the ones you have been practicing in Part 1 of the assignment the 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. Days Spent in Refugee Camp 12 73 60 105 98 76 89 173 189 203 138 215 71 67 63 184 63 HTQ Part 4 Score 0.4 1.1 0.9 2.3 1.7 0.3 0.7 2.6 3.1 3.0 1.9 2.5 0.7 1.2 1.8 2.9 0.6 a) Paste SPSS output b) Construct a scatterplot of the relationship between the 2 variables. Plot the regression line on this graph. c) Are the number of days spent in a refugee camp predictive of trauma in this sample? Write a Results section in current APA style describing the outcome. All homework \"Results sections\" must follow the example given in the SPSS tutorial presentation and the Course Content document \"Writing Results of Statistical Tests in Current APA Format.\" The statistical statement for a bivariate linear regression must include at least the equation of the line and the confidence interval for the slope (the second row under Confidence Intervals in the output), as well as a decision about the null hypothesis. Part 3: Cumulative Homework Page 3 of 5 PSYC 355 1. Research scenario: To investigate the relationship between hours spent studying and exam scores, researchers found the scores in the following table. Is there a significant relationship between hours spent studying and scores? Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under the table on the following page. Page 4 of 5 PSYC 355 Hours Spent Studying 1 3 3 4 4 5 5 5 6 6 7 7 8 Exam Scores 40 50 51 61 73 71 64 75 68 76 94 85 84 a) Paste appropriate SPSS output. b) Paste appropriate SPSS graph. c) Write a Results section in current APA style describing the outcome. All homework \"Results sections\" must follow the example given in the Course Content document \"Writing Results of Statistical Tests in Current APA Format.\" Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 6. Page 5 of 5