Step 1: A researcher is interested in comparing the performance of students in a class taught using Team-Based Learning to the performance of students in a traditional class. The researcher expected that the class using Team-Based Learning will have higher scores than the traditional class. The data are provided in the table below, with the traditional class coded as group 1 and the Team-Based Learning class coded as group 2. What are the null and research hypotheses?
Ho:
Hi:
Step 2: Using an alpha level of .01, calculate a t test for the independent samples and indicate the decisions you would make for the statistical hypotheses. If you find a statistically significant difference, calculate the size of the effect using all three types of effect size calculations. For each indicate how the effect size would be interpreted.
Grade Class
20.00 1.00
20.50 1.00
21.00 1.00
20.50 1.00
20.00 1.00
24.50 2.00
23.50 2.00
20.00 2.00
23.50 2.00
24.00 2.00
22.50 2.00
Please keep your work organized and highlight your answers for the following elements:
- df and tcrit
- M and SS
- S2p and s(M1-M2)
- t statistic
- Null decision and research hypothesis conclusion
- Cohen's d and its interpretation
- r2 and its interpretation
- **95% Confidence Interval and its interpretation
Step 3: Write up a brief description of the research result reporting sample size, descriptive statistics (means and standard deviations for each group), and the results of the t test.