EXAMPLE independent t test.pdf- Statistical Reasoning in Educational Research

PMC 500

1. PMC500/Statistical Reasoning in Educational
Research
PLG 500 PenaakulanStatistikdalamPenyelidikan
Pendidikan
Dr. MuzirahMusa

2. EXAMPLE
independent t-test

3. •A study was done to compare job stress
between two employee groups (lecturers and
teachers). Data were solicited from a randomly
selected sample.
1.Test whether the data is normally distributed
or not? If Yes, proceed with the test.
2.State null and alternative hypothesis.
3.Does the scores of the dependent variable for
both groups in the population have equal
variance? Explain your answer.
4.What is your decision of this test?
5.State the conclusion based on your decision.
Data set:
Lecturer Teachers
25 19
23 24
23 26
24 25
20 18
19 21
24 20
22 21
27 24
21 23

4. Test using SPSS: Data

5. 1. Test of normality

6. •The p value for LECTURER is .200 (p > 0.05), then the distribution
of this data is NORMAL.
•The p value for TEACHER is .200 (p > 0.05), then the distribution of
this data is NORMAL.
•

7. When points form a linear pattern, the distribution is
NORMAL.

8. 2.State null and alternative hypothesis.
•Null Hypothesis
There is no statistically significant difference in mean level Job
Stress between LECTURERS and TEACHERS in the population.
•Alternative Hypothesis
There is a statistically significant difference in mean level Job
Stress between LECTURERS and TEACHERS in the population.

9. 3. Does the scores of the dependent variable for both groups in
the
population have equal variance? Explain your answer.
4. What is your decisionof this test?

10. Since, the p value is 0.434 (p >
0.05), therefore, the two
groups(male and female) have
equal variance.
Since,the p value is 0.546 (p > 0.05), therefore,
the null hypothesis is failto reject. Hence, There is
no significant difference in the mean job stress
between the lecturers and teachers.
What is your decisionof this test?
Equal variance or not equal variance ?
State the conclusionbased on your
decision.
•Conclusion:
•Thus, the finding indicated that employment
status has no effect on employee’s job stress.

11. How to write a report/result (APA style)
•An independent t-test was performed comparing the mean job
stress between the two employee groups (lecturers and
teachers). The result revealed that the mean job stress of lecturer
(M= 22.8, SD=2.39) and teachers (M= 22.1, SD=2.69)are
significantly not difference t(18)=0.615, p > 0.05.

12. •An independent t-test was performed comparing the
mean job stress between the two employee groups
(lecturers and teachers). The result revealed that the mean
job stress of lecturer (M= 22.8, SD=2.39)and teachers
(M= 22.1, SD=2.69)are significantly not difference
t(18)=0.615, p > 0.05.
Thus, the finding indicated that employment status
has no effect on employee’s jobs stress.

13. Thank you