You plan to develop regression models to investigate the factors that influence students’ final exam performance. However, you are not sure how to handle the country of citizenship variable. After further discussion and based on international standardised tests, you and your project officer believe that East Asian students tend to have stronger maths background, and decide to create three categories: Australian, East Asian and others, to re- code this variable. You also agree that East Asian students should include those from China, Japan, Korea, Taiwan and South East Asian countries, and that students from New Zealand are not classified as Australian.
You conduct a stepwise regression according to the following procedure:
Step 1: Gender only
Step 2: Gender and Degree Type
Step 3: Gender, Degree Type and Country of Citizenship
Step 4: Gender, Degree Type, Country of Citizenship and Lecture Attendance
- (a) Present the regression output for each of the four steps in a table. You should outline the regression model, the coefficient values and a summary of the adequacy of the model. (4 marks)
- (b) Based on the regression output obtained in Step 4, answer the following questions:
- (c) Describe the changes to the regression coefficient of Gender and its statistical significance when Degree Type is added to the model in Step 2. Considering also the result in Question 2 in Task 1, discuss if there is any gender difference in exam performance.
(3 marks)
Task 3 (Further Analysis)
You discuss the findings obtained from Tasks 1 and 2 with the project officer, suspecting that the effects of Gender, Country of Citizenship and Lecture Attendance on exam performance may depend on (or interact with) Degree Type. The project officer suggests you conduct separate regression analyses for single and double degree students. She also points out that appropriate use of Pivotal Table to analyse the data can also be very insightful.
You are asked to present the findings from your further analysis in a brief report (word limit 500). In this report, you can incorporate relevant findings from Tasks 1 and 2 in your analysis of the factors influencing exam performance in Data Analysis.
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