7. In stepwise regression Step 6 you noticed that the regression coefcient of ATAR is negative (l). Does this result surprise you, given the correlation of ATAR and GPA? Why/Why not? Does the inclusion of ATAR improve overall model t? Discuss fully. (3 marks) Task 3 (Summary Report) As the chief project ofcer, you are asked to write a summary report (300 words) detailing all the ndings from your data analysis. The issues you can discuss in your report should include (but are not limited to) the following: 0 There has been research evidence that SES and academic achievement are closely related 5. Based on your analysis in this study, critically examine education researchers' claim that student SES has an impact on their academic performance. 0 Do you think there is any gender difference in academic achievement of Science students? 0 In stepwise regression from Steps 1 to 3 where HS_SCI, HS_ENG and HS_MATH are added to the model progressively, observe the changes to the regression (slope) coefcient of the independent variable, HS_SCI. Do you think HS_SCI is a good predictor of students' GPA? 0 Is ATAR a good predictor of GPA? Should ATAR be included in the model? 0 Based on this study, what is the nal model you would recommend to the Head of the Science Department? 0 Comment on the overall adequacy of the nal model. 0 Are there any other important factors inuencing academic performance that were not included in this study? What are they? (6 marks)