ECMT1010 (2023, Semester 2) Assignment
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ECMT1010 (2023, Semester 2) Assignment
Due: 6.00pm Friday 27 October 2023
Aim: This assignment illustrates the use of various statistical techniques in an economic ap- plication. You will use software (e.g., Excel, StatKey) to analyze real data to investigate the relationship between wage rates and level of education as well as differences between males and females.
Data description: The dataset is a student survey containing information on hours of exercise per week, GPA, and Gender. You are assigned a data set containing 150 randomly-selected students from the survey.
Your data set is available in the Excel spreadsheet Studnets#.xlsx (where # is the last digit of your SID). It contains 3 columns and 151 rows. The first row contains the variable names; the remaining 150 rows contain the information for each of the 150 students in your sample. The Exercise column identifies the number of hours of exercise per week, GPA is each student’s grade point average, GenderCode is gender (1 = male, 0 = female).
Hint: You can import the Excel file into StatKey using the ‘Upload File’ facility after first con- verting the file into csv format.
Specific instructions: Answer all 9 questions below. Show all numerical answers to 3 decimal places. Carryout all tests using a 1% level of significance.
QUESTIONS
Virgil believes that GPA depend negatively on hours per week of exercise.
1. Using appropriate software, produce a scatterplot of GPA against hours per week of exercise using your sample. Compute the sample correlation and comment on whether you agree with Amy. [2 marks]
2. Test whether there is a statistically significant linear association between GPA and hours per week of exercise, showing all your steps and clearly stating your conclusion. [4 marks]
Virgil sets up a regression model to investigate whether GPAs depend negatively on hours per week of exercise.
3. Write down Virgil’s regression model taking care to define your notation clearly. Using ap- propriate software, estimate the regression model and report your results. [2 marks]
4. Use your regression results to give a one-sentence interpretation of the regression slope estimate. [2 marks]
5. Test whether on hours per week of exercise is an effective predictor of GPAs in the regression model you have estimated in question 3. Make sure to report your null and alternative hypotheses, the test statistic, decision rule, and conclusion to the test. [2 marks]
Virgil suspects that women have higher GPA than men on average. To investigate this claim statistically, you will use a hypothesis test.
6. Set up the null and alternative hypotheses taking care to define your notation clearly. [2 marks]
7. Using the ‘Shift Groups’ randomization method in Statkey, produce a dotplot of the random- ization distribution (with at least 2,000 samples) of the appropriate sample statistic. Carry out the hypothesis test using the randomization distribution and state your conclusion. [2 marks]
8. Verify that the Central Limit Theorem applies in this case, carry out the same hypothesis test using the appropriate approximation and state your conclusion. Briefly compare these results to your findings in question 7. [2 marks]
9. Does the evidence suggest that women’s GPAs are higher than men’s GPA because of their gender? Explain. [2 marks]
2023-10-23