Homework SourseA research psychologist wants to investigate the impact of i
A research psychologist wants to investigate the impact of instructor feedback on mastery of a complex learning task. Four groups of ten students are selected to participate. One group receives only positive feedback, another only negative feedback. The third group receives both positive and negative feedback, and the fourth group receives no feedback. Use the c2 test for homogeneity to determine if successful mastery differs by type of feedback.
Feedback
Successful
Unsuccessful
Positive
6
4
Negative
4
6
Both
8
2
None
3
7
| Feedback | Successful | Unsuccessful |
| Positive | 6 | 4 |
| Negative | 4 | 6 |
| Both | 8 | 2 |
| None | 3 | 7 |
Solution
H0: Successful mastery and feedback are independent
Ha: There is association between the two
Two tailed chi square test.
The chi-square statistic is 5.9148. The P-Value is 0.11583. The result is not significant at p < 0.05.
| Results | ||||||
| Successful | Unsuccessful | Row Totals | ||||
| Positive | 6 (5.25) [0.11] | 4 (4.75) [0.12] | 10 | |||
| Negative | 4 (5.25) [0.30] | 6 (4.75) [0.33] | 10 | |||
| Both | 8 (5.25) [1.44] | 2 (4.75) [1.59] | 10 | |||
| None | 3 (5.25) [0.96] | 7 (4.75) [1.07] | 10 | |||
| Column Totals | 21 | 19 | 40 (Grand Total) |
