In what follows use any of the following tests/procedures: Regression, confidence intervals, one-sided t-test, or two-sided t-test.
Question:
In what follows use any of the following tests/procedures: Regression, confidence intervals, one-sided t-test, or two-sided t-test. All the procedures should be done with a 5% P-value or 95% confidence interval.
The empirical literature suggests that class absenteeism undermines students’ academic performance and that an enforced mandatory attendance policy may be beneficial.
Open Attendance data. Using data on 90 second-year students enrolled in a Statistics course, test if students who are assiduous in attending lectures have higher final grades than students who are usually absent.
1. What test/procedure did you perform? (5 points)
- a. One-sided t-test
- b. Two-sided t-test
- c. Regression
- d. Confidence Interval
2. What is the P-value/margin of error? (5 points)
- a. 0.005589
- b. 0.02794
- c. 0.05589
- d. 0.002794
3. What is the Statistical interpretation? (5 points)
- a. The P-value is smaller than 0.5 thus we are confident to say that assiduous students have higher final grades.
- b. The P-value is greater than 5% thus the answer is inconclusive.
- c. The P-value is much smaller than 5% thus we are very certain that the slope is not zero.
- d. None of these
4. What is the conclusion? (5 points)
- a. The test is inconclusive and more data is needed.
- b. We are confident that regular attending students have higher final grades than absentee students.
- c. We cannot be confident that students who are assiduous in attending lectures have higher final grades than students who are usually absent.
- d. Since the test is inconclusive the conclusion is inconclusive as well.
- e. None of these.
In what follows use any of the following tests/procedures: Regression, confidence intervals, one-sided t-test, or two-sided t-test. All the procedures should be done with a 5% P-value or 95% confidence interval.
The empirical literature suggests that class absenteeism undermines students’ academic performance and that an enforced mandatory attendance policy may be beneficial.
Open Attendance data. Using data on 90 second-year students enrolled in a Statistics course, test if students who are assiduous in attending lectures have higher final grades than students who are usually absent.
1. What test/procedure did you perform? (5 points)
- a. One-sided t-test
- b. Two-sided t-test
- c. Regression
- d. Confidence Interval
2. What is the P-value/margin of error? (5 points)
- a. 0.005589
- b. 0.02794
- c. 0.05589
- d. 0.002794
3. What is the Statistical interpretation? (5 points)
- a. The P-value is smaller than 0.5 thus we are confident to say that assiduous students have higher final grades.
- b. The P-value is greater than 5% thus the answer is inconclusive.
- c. The P-value is much smaller than 5% thus we are very certain that the slope is not zero.
- d. None of these
4. What is the conclusion? (5 points)
- a. The test is inconclusive and more data is needed.
- b. We are confident that regular attending students have higher final grades than absentee students.
- c. We cannot be confident that students who are assiduous in attending lectures have higher final grades than students who are usually absent.
- d. Since the test is inconclusive the conclusion is inconclusive as well.
- e. None of these.
DATA:
absent assiduous
60 90
80 40
80 70
70 60
70 100
40 100
60 100
70 90
90 90
70 50
70 90
50 30
70 10
90 40
40 80
60 90
50 80
30 40
70 70
50 40
40 70
60 50
0 60
70 90
20 90
10 80
70 60
60 80
20 70
70 30
80 80
20 40
40 60
30 80
60 60
40 90
20 70
90 70
60 80
40
100
70
60
70
80
90
70
60
40
Expert Answer:
Database Processing Fundamentals, Design, and Implementation
ISBN: 978-0133876703
14th edition
Authors: David M. Kroenke, David J. Auer
