ࡱ> 5@ 0Lbjbj22 "PXXK%%0008hL4P)h"((((((($*R -(9 -^  ( ) ( (*r&T' @@[0K'( )0P)Y'-Z-'-'+r\((0d0Psy 521/621 Lab 5 Activities Correlation and Simple Regression Learning Objectives: Learn to conduct and interpret significance tests for correlations Learn to conduct and interpret significance tests for simple regression To accomplish these learning objectives, we fill focus on the end-of-lesson exercises in Lessons 31 and 33 of the Green and Salkind book. DATA FILE: Lesson 31 exercise File 2 We are interested in relating quality of teaching to quality of research by college professors. Sample includes 50 social science teachers who have been evaluated over a ten-year period. These ratings are averaged to create an overall quality rating as an instructor (rating_1) and the overall quality of the course (rating_2) for each professor. We also obtain the number of articles published in the ten year period (num_pub) and the number of times these articles have been cited (cites). Open Lesson 31 Exercise 1. Click Analyze(Correlate( Bivariate. Move all variables over into the Variables box. Makes sure Pearson, Two-tailed, and Flag significant are checked. Click Options( check Means and Standard Deviations. Click OK. Correlations   What is the p value for the correlation between rating_1 and rating_2? p < .001 What is the correlation between number of citations and number of publications? r r = .83 What is the correlation between number of citations and instructor quality? r = .31 2. What is the relationship between the number of articles published and the overall quality of the instructor? r = .23, p = .11; there is a small but non-significant relationship between number of articles published and the overall quality of the instructor. 3. APA results section: Correlation coefficients were computed among the four evaluation variables for the college professors. Four of the six correlations shown in Table 1 were greater than or equal to .35 and statistically significant at the .05 level. The correlations between the two teaching evaluation variables (overall quality of instructor and of the course) and between the two research evaluation variables (number of publications and number of citations) were higher than the correlations between the teaching and the research variables. In general, however, the results suggest that professors who are productive in research also tend to be rated as better teachers. 4. Lets create a scatterplot matrix to accompany the APA results section. Click Graphs(Scatter(Matrix(Define. Move all variables into the Matrix Variables box and click OK.  DATA FILE: Lesson 31 Exercise File 2 We are interested in testing whether students tend to do well, average, or poorly across all subjects. First we want to investigate the relationships of students GPA in math and science with students GPA in social sciences and humanities (English and history). Open Lesson 31 Exercise 2. Click Analyze(Correlate( Bivariate. Move all variables over into the Variables box. Makes sure Pearson, Two-tailed, and Flag significant are checked. Click Options( check Means and Standard Deviations. Click OK. Correlations   What can we conclude about the relationships of students GPA in math and science with students GPA in social sciences and humanities (English and history)? Lets look across the first two rows to get an idea of how these variables relate. Math: correlated with all social science/humanities subjects Science: only (negatively) correlated with History What information can we get from this correlation matrix that might explain why we would not expect the relationship between math and social science/humanities to be similar to the relationship between science and social science/humanities? --look at the correlation between math and science: r = .004. These two variables are not at all related, so we would not necessarily expect them to relate in the same ways to other variables. Now lets create two new variables: (1) an average GPA in math and science and (2) an average GPA in social sciences and humanities. Next we will conduct a correlational analysis on the two averaged scores. Transform(Compute. Name the new variable Math_sci_avg. Place the following equation in the Numeric Expression box: (mathgpa + sciengpa) / 2. Click OK. Now click Transform(Compute. Name the new variable Soc_hum_avg. Place the following equation in the Numeric Expression box: (socgpa + enggpa + histgpa) / 3. Click OK. Go to Analyze(Correlate( Bivariate. Move both averaged variables over into the Variables box. Makes sure Pearson, Two-tailed, and Flag significant are checked. Click Options( check Means and Standard Deviations. Click OK Correlations   Would our conclusions drawn from each analysis differ? If so, how so? In the first analysis, the relationships between math and social science/humanities, and science and social science/humanities were different. Here, by averaging the math/science scores, it appears that grades in one area (math/science) are related to grades in the other area (social science/humanities). The conclusions drawn from each analysis are different. DATA FILE: Lesson 33 Exercise File 1 Peter is interested in whether children who hit a Bobo doll more frequently will be more or less aggressive on the playground. Ten boys were encouraged to hit the Bobo doll for five minutes and the number of times they hit the doll was recorded (this variable is called Bobo). Peter then recorded the number of times each boy struck a classmate on the playground (peer). First we will conduct a linear regression to predict the number of times a boy would strike a classmate from the number of times the boy hit the bobo doll. Open Lesson 32 Exercise File 1. Click Analyze(Regression(Linear. Move Peer to the Dependent box. Move Bobo to the Independent(s) box. Click Statistics and check Confidence Intervals and Descriptives. Make sure Estimates and Model Fit are also selected. Click Continue and OK. Regression       What is the slope associated with the predictor? 2.32 What is the additive constant for the regression equation? .22 What is the mean number of times the boys struck a classmate? 11.60 What is the correlation between the number of times hitting a classmate and the number of times hitting the bobo doll? .93 What is the standard error of the estimate? 7.84 2. What is the relationship between the multiple R and the bivariate correlation between the predictor and the criterion? The two are equivalent. Why? Because in this case there is only one predictor. 3. Lets create a scatterplot and fit a regression line to the plot. Got to Graph( Scatter. Click Simple(Define. Move Peer to the Y axis box. Move Bobo to the X axis box. Click OK. Double click the chart to select it for editing in the Output file. Double click on a data point and make sure all data points become highlighted. In chart editor box, click Chart(click Options (Fit line at total. Click OK.  DATA FILE: Lesson 33 Exercise File 2 Betsy is interested in determining whether the number of publications by a professor can be predicted from work ethic. She uses the data regarding the number of publications from 50 professors who have been at the same university for a ten-year period (num_pubs). She has also collected professors scores on a work ethic index (work_eth), where higher scores are equated to stronger work ethic. Lets conduct a bivariate linear regression to evaluate Betsys research question. Open Lesson 33 Exercise File 2. Click Analyze(Regression(Linear. Move Num_pubs to the Dependent box. Move Work_eth to the Independent(s) box. Click Statistics and check Confidence Intervals and Descriptives. Make sure Estimates and Model Fit are also selected. Click Continue and OK. Regression       What is the significance test that assesses the predictability of number of publications from work ethic? F(1, 48) = 21.03, p < .001. What is the regression equation? Predicted no. of publications = -2.96 + .45(Work Ethic) What is the correlation between number of publications and work ethic? r = .55 2. Lets create a scatterplot and fit a regression line to the plot. Got to Graph( Scatter. Click Simple(Define. Move Num_pubs to the Y axis box. Move Work_eth to the X axis box. Click OK. Double click the chart to select it for editing in the Output file. Double click on a data point and make sure that all data points become highlighted. In chart editor box, click Chart(Add chart element(Fit line at total. Click OK.  What does this graph tell us? The scatter plot tells us that overall, number of publications is predicted fairly well by work ethic. However, the prediction is not as good for individuals with higher work ethic scores. 3. Sample APA results section: A linear regression analysis was conducted to evaluate the prediction of the number of publications from professors work ethic. The regression equation was v = .45Xwork ethic  2.96. The 95% confidence interval for the slope was .25 to .65. These results suggest that professors who have higher work ethic scores tend to have more publications. Work ethic was relatively accurate in predicting the number of publications. The correlation between professors work ethic and number of publications was .55, t(48) = 4.59, p < .01. Approximately 31% of the variance in the number of publications was accounted for by its linear relationship with work ethic. 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