PowerPoint Presentation by A4A11h

VIEWS: 13 PAGES: 176

									                                 Percentage of Sample




                                 0
                                     5
                                         10
                                              15
                                                   20
                                                        25
                       0- 1
                           0                                 30
                     101 0
                        - 12
                     126 5
                        - 15
                             0
                     151
                        - 17
                             5
                     176
                        - 20
                     201 0
                        - 22
                             5
                     226
                        - 25
                     251 0
                        - 27
                             5
                     276
                        - 30
                     301 0
                        - 32
                             5

Total Grade Points
                     326
                        - 35
                             0
                     351
                        - 37
                                                                                                                 Full Class, N = 424, median grade = 261




                     376 5
                        - 40
                             0
                                                                  Interview Sample, N = 32, median grade = 305




                        400
                             +
       VB
W    VA   P dV
       VB
W    VA   P dV
       VB
W    VA   P dV
                        100
Correct responses (%)




                         80
                                                                       Intro Physics, Pretest


                         60                                            Intro Physics, Posttest

                                                                       Thermal Physics, Pretest
                         40
                                                                       Thermal Physics, Posttest
                         20

                          0
                              S(system)   S(surroundings)   S(total)
                            Correct Responses
              Spring 2005, Fall 2005, Spring 2006 (N = 609)


60%


50%


40%


30%           50%                 49%

20%


10%                                                   14%
                                                                        5%
0%
      Entropy change of   Entropy change of Entropy of object +   All Correct
          object not      air in the room not air in the room
        determinable         determinable        increases
            Pre-Instruction Responses Consistent
                 with Entropy "Conservation"
               General-Context Question (N = 1184)   Concrete-Context Question (N = 609)

80%
70%
60%
50%
40%
             66%      71%
30%
20%                                                  38%
                                            29%                            26%
10%                                                                                 22%
0%
        Total entropy [(system +        Argument #1: (a) and (b)     Argument #2: (a) increases
      surroundings) / (object + air)] undeterminable, but (c) total     (or decreases) and (b)
           remains the same            entropy remains the same decreases (or increases), but
                                                                    (c) total entropy remains the
                                                                                 same
        General-Context Question Pre-Instruction vs.
                     Post-Instruction
                        Before Instruction (N = 1184)      After Instruction (N = 255)

70%

60%

50%

40%
             66%
30%                    56%

20%
                                               29%                                         27%
10%                                                     20%                      26%

0%
        Total entropy [(system +          Argument #1: (a) and (b)        Argument #2: (a) increases (or
      surroundings) / (object + air)]   undeterminable, but (c) total   decreases) and (b) decreases (or
           remains the same              entropy remains the same        increases), but (c) total entropy
                                                                                remains the same
      Concrete-Context Question, Pre-Instruction vs.
                    Post-Instruction
                       Before Instruction (N = 609)        After Instruction (N = 251)

80%


70%


60%


50%


40%

             71%       68%
30%


20%
                                              38%       35%

10%                                                                              22%       22%

0%
        Total entropy [(system +         Argument #1: (a) and (b)         Argument #2: (a) increases (or
      surroundings) / (object + air)]   undeterminable, but (c) total   decreases) and (b) decreases (or
           remains the same              entropy remains the same        increases), but (c) total entropy
                                                                                remains the same
                        100
Correct responses (%)




                         80
                                                                       Intro Physics, Pretest


                         60                                            Intro Physics, Posttest

                                                                       Thermal Physics, Pretest
                         40
                                                                       Thermal Physics, Posttest

                         20


                          0
                              S(system)   S(surroundings)   S(total)
                   Q                    Q
S total                                          0
             Tcold reservoir       Thot reservoir
                   Q                    Q
S total                                          0
             Tcold reservoir       Thot reservoir
             Pre-instruction (N = 1184)
             Post-instruction, no tutorial (N = 255)
             Post-instruction, with tutorial (N = 237)

80%
70%

60%
50%

40%
30%
20%

10%
0%

      S(total) correct          All three questions correct
         Pre-instruction   Post-instruction, with tutorial

90%
80%
70%
60%
50%
40%
30%
20%
10%
0%

      S(total) correct         All three questions correct

								
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