This page has two analyses that provide extra detail.

The first about the triplets and performance across them, and the second is about the videos, and which triplets are covered in each video.

Analysis and Structure of the Triplets

Detailed analysis of the 20 questions in the homework, and how there were 5 key triplets of questions. You can call see from this table the percent correct across the three items in each triplet.  You see a generally flat trajectory in the control group, and learning in the control.  Triplet 4 is one notable exception that does not seem to show learning in the experimental group.  We can only speculate, but it might be caused by  some proactive interference from them learning on triplet 3 that then interference with learning on triplet 4.  But this is conjecture. 

Triplet

Content and Example

HW Ques. #s

% Correct in Control

% Correct in Expr

1

Multiplying powers with like bases: “(33)(3-2)”

4, 5, 6

61,61,66

27,61,84

2

Multiplying powers with variable bases and coefficients:“(3x4)(2x-2)”

8, 9, 10

55,55,39

 39,68,45

3

Dividing powers with like bases:“(65)/(6-7)”

11, 12, 13

36,42,45

23,58,87

4

Dividing powers with variable bases and coefficients:“(2y9)/(8y3)”

14, 15, 16

48,21,52

16,3,23

5

Dividing powers with multiple variable bases:“(x4y2)/(x-8y-3)”

17, 18, 19

73,73,72

58,77,94

Additional Questions

Rewriting negative exponents using only positive exponents: “Rewrite 4-3 using only positive exponents.”

1, 2, 3

100,100,100

90,100,100

Challenge Questions for ecological validity not tested

Exponent= 0 “1210”

Dividing powers with multiple variable bases where an exponent is 1

“(x2y)/(x12y7)”

7

20

67     

56     

71

70

 

Analysis of the videos

The following table show which questions were review from each video.

Condition

Time Spent

Question Numbers Reviewed

Triplets Addressed

YouTube URL (links are easier to browse from here http://web.cs.wpi.edu/~nth/PublicScienceArchive/Analysis.htm)

Order Number on Film

Control

6 min 49 sec

15, 17, 15

4, 5, 4

http://www.youtube.com/watch?feature=player_embedded&v=tBhcuCnKVCY

48

Control

5 min 42 sec

8, 4

2, 1

http://www.youtube.com/watch?v=H4eU_dHXBmc

50

Control

9 min 27 sec

7, 11, 10, 15, 14, 16, 8

 3, 2, 4, 4, 4, 2

http://www.youtube.com/watch?v=mvL6ownKFwo

52

Exper.

5 min 52 sec

4, 10, 14, 15

1, 2, 4, 4

http://www.youtube.com/watch?v=_JEOAqLtL_U

49

Exper.

9 min 30 sec

4, 10, 14, 15, 16

1, 2, 4, 4, 4

http://www.youtube.com/watch?v=cXuvOKotIRs

51

Exper.

9 min 26 sec

4, 10, 14, 15, 12

1, 2, 4, 4, 3

http://www.youtube.com/watch?v=Jn4BtACGZjA

53

 

Kelly (2012).