A research psychologist wants to investigate the impact of instructor feedback o

Question

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

Explanation / Answer

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)

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