Psych 280 - Spring 2016 Please Write Name on BACK of Paper Homework 12 A researcher was interested in whether the number of cups of coffee a person drinks is associated with their physical restlessness, based on an observational restlessness rating assigned by a research assistant. The following data were recorded. Scores Deviations Cups of Coffee (X) Restlessness Rating (Y) 1 2 2 3 2 4 4 5 4 4 5 6 X=18 Y=24 M =3 M =4 x Y X-M x Squared Deviations Y-M Y 2 (X-M ) 2 (Y-M ) x Y SS = SS = X 1. Fill in the chart above. 3.5 pts 2. What are the two variables in the study? 1 pt 3. What are the hypotheses in this study? 1 pts 4. What are the degrees of freedom for this statistical test? 1 pt Y Products (X-Mx) (Y-MY) SP= Psych 280 - Spring 2016 Please Write Name on BACK of Paper 5. What is the critical value for this test? 1 pt 6. Calculate the test statistics (r) for this study. 2 pts 7. What is the direction of this correlation? Interpret what the direction of the correlation means in the context of this study? 1 pt 8. How would you interpret the strength of this correlation? Why? 1 pt 9. Make a statistical decision about the null. Will you reject or retain the null based on your sample data? (Be sure to include appropriate test statistic and decision criteria). 1 pt 10. Provide a substantive conclusion about the results from your sample data. (Be sure to include the research context) 1 pt 11. Sketch a scatterplot of the data by hand. 2 pt Open the 'Homework 12 Dataset_S16.sav' file for this problem. Psych 280 - Spring 2016 Please Write Name on BACK of Paper To conduct a correlation, go to Analyze>Correlate>Bivariate. Move variables to the Variables box. Click OK to run the test. 1. Attach a copy of your output to the homework. 1 pt 2. What are the variables in this study? 1 pt 3. What is the obtained r for the correlation? 1 point 4. Using the p value from the SPSS output, make a statistical decision about the correlation. 1.5 pt