The document discusses different methods for analyzing pre-test and post-test data from physics courses, including analyzing normalized average gain (<g>) and calculating effect sizes. It reports on a study of 62 introductory physics courses that found:
(1) Traditional lecture courses had an average normalized gain of 0.23, while interactive engagement courses averaged 0.48;
(2) Calculated effect size was higher for interactive engagement courses (d=2.18) than traditional courses (d=0.88);
(3) Normalized average gain provides a useful measure for comparing course effectiveness across groups with varying initial knowledge.
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Discussion - Week 7 Quantitative Reasoning and Analysis (R.docxlynettearnold46882
Discussion - Week 7
Quantitative Reasoning and Analysis (RSCH - 8201Z - 1)
Discussion - Week 7
Research Design for One-Way ANOVA
Student: Agha Bakht, [email protected]
Student ID # A00136458
Program: PhD in Management
Specialization: Leadership and Organizational Change
Faculty: Dr. Tom Spencer: [email protected]
Walden University
January 11, 2017
Hi Dr. Thomas Spencer,
Discussion - Week 7
Research Design for One-Way ANOVA
In response to discussion for the week 7, I used General Social Survey Data to construct a research questions and answered by ANOVA. In the day 3 posting please see below responses.
Q: 1 what is your research question?
There is a correlation between the Groups and within Groups. Sum of squares for Groups=474058.682, within Groups=743670.506 and Total=1217729.188.
Q: 2 what is the null hypothesis for your question?
In the research hypothesis there is a correlation between the Groups and within Groups. Sum of squares for Groups=474058.682, within Groups=743670.506 and Total=1217729.188. In the null hypothesis mean square relation is calculated between the group=118514.671 and within Groups=307.048.
Q: 3 what research design would align with this question?
A quantitative research method would be the ideal research design for this question, specifically because it is an analysis of the correlation between two variables (R's socioeconomic index (2010) and sei10.
Q: 4 what dependent variable was used and how is it measured?
R's socioeconomic index (2010).
Q: 5 what independent variable is used and how is it measured?
sei10.
Q: 6 if you found significance, what is the strength of the effect?
The significance level is .000, which is well below ONEWAY sei10 BY degree
/MISSING ANALYSIS/POSTHOC=BONFERRONI GH ALPHA (0.05).
Q: 7 explain your results for a lay audience and further explain what the answer is to your research question.
Based upon the post hoc test it is determined that we have to reject our null hypothesis that Bonferroni and Games-Howell
HIGH SCHOOL
LT HIGH SCHOOL
10.6923*
1.1432
.000
JUNIOR COLLEGE
-9.2956*
1.3924
.000
BACHELOR
-21.7874*
.9580
.000
GRADUATE
-35.5267*
1.1732
.000
GET
FILE='D:\Walden_RSCH-820Z-1\Assignment\GSS2014_agha bakht_8210 (1).sav'.
DATASET NAME DataSet1 WINDOW=FRONT.
ONEWAY sei10 BY degree
/MISSING ANALYSIS.
Oneway
[DataSet1] D:\Walden_RSCH-820Z-1\Assignment\GSS2014_agha bakht_8210 (1).sav
ANOVA
R's socioeconomic index (2010)
Sum of Squares
df
Mean Square
F
Sig.
Between Groups
474058.682
4
118514.671
385.981
.000
Within Groups
743670.506
2422
307.048
Total
1217729.188
2426
ONEWAY sei10 BY degree
/MISSING ANALYSIS
/POSTHOC=BONFERRONI GH ALPHA(0.05).
Oneway
ANOVA
R's socioeconomic index (2010)
Sum of Squares
df
Mean Square
F
Sig.
Between Groups
474058.682
4
118514.671
385.981
.000
Within Groups
743670.506
2422
307.048
Total
1217729.188
2426
Post Hoc Tests
Multiple Comparisons
Dependent Variable: R's socioeconomic index (2010)
(I) RS HIGHEST DEGRE.
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Analyzing change gain hake
1. ANALYZING CHANGE/GAIN SCORES*†
Richard R. Hake, Dept. of Physics, Indiana University
24245 Hatteras Street, Woodland Hills, CA, 91367 USA
In an American Educational Research Association (Division D)* mailing list posting of 22 Feb 1999 of
the above title John Reece wrote: "I am looking for some good references on the analysis of
gain/change scores. The type of scenario I’m interested in is either an experimental or quasi-
experimental pre-test/intervention/post-test design. I’m particularly interested in the issues surrounding
the use of ANCOVA versus direct analysis of gain scores."
In the survey of refs. 2-4, I did not make use of ANCOVA (ANalysis of COVAriance1) , but instead
analyzed gains in terms the average normalized gain <g> for a course, defined as the ratio of the actual
average gain <G> to the maximum possible average gain, i.e.,
<g> ≡ %<G> / %<G>max = (%<Sf> - %<Si>)/(100 - %<Si>),........................................(1)
where <Sf> and <Si> are the final (post) and initial (pre) class averages on the "Force Concept
Inventory,"5 a well-known test of conceptual understanding of Newtonian mechanics.
I operationally defined:
(a) "Interactive Engagement" (IE) methods as those designed at least in part to promote conceptual
understanding through interactive engagement of students in heads-on (always) and hands-on (usually)
activities which yield immediate feedback through discussion with peers and/or instructors, all as judged
by their literature descriptions;
(b) "Traditional" (T) courses as those reported by instructors to make little or no use of IE methods,
relying primarily on passive-student lectures, recipe labs, and algorithmic-problem exams;
(c) "Interactive Engagement" (IE) courses as those reported by instructors to make substantial use of IE
methods;
(d) "High-g" courses as those with (<g>) > 0.7;
(e) "Medium-g" courses as those with 0.7 > (<g>) > 0.3;
(f) "Low-g" courses as those with (<g>) < 0.3.
_______________________________________________________
*Originally posted on 3/13/99 at AERA-D - American Educational Research Association’s Division D, Measurement and
Research Methodology (archived in a somewhat garbled form at
<http://lists.asu.edu/cgi-bin/wa?A2=ind9903&L=aera-d&P=R6855>). Some minor additions and corrections were made on
6/16/99 by R. Hake.]
†This work received partial support from NSF Grant DUE/MDR9253965.
Richard R. Hake, 6/19/99. Permission to copy or disseminate all or part of this material is granted provided that the copies
are not made or distributed for commercial advantage, and the copyright and its date appear. To disseminate otherwise, to
republish, or to place at another Web site requires written permission. Comments and corrections are welcome at R.R. Hake,
24245 Hatteras St., Woodland Hills, CA, USA 91367, <rrhake@earthlink.net>.
1
2. The regularities for courses with a wide range of average pretest scores [18 < (<Si>) < 71] and with
diverse student populations in high schools, colleges, and universities was noteworthy:
(A) All points for the 14 T courses (N = 2084) fell in the Low-g region. The data3 yielded
<<g>>14T = 0.23 ± 0.04sd.................................................................... (2a)
[Double carets "<<X>>NP " indicate an average of averages, i.e., an average of <X> over N courses of
type P, and sd ≡ standard deviation.]
(B) Eighty-five percent (41 courses, N = 3741) of the 48 IE courses fell in the Medium-g region and
15% (7 courses, N = 717) in the Low-g region. Overall, the data3 yielded
<<g>>48IE = 0.48 ± 0.14sd................................................................... (2b)
(C) No course points lay in the "High-g" region.
I inferred from features A, B, and C that a consistent analysis over diverse student populations with
widely varying initial knowledge states, as gauged by <Si>, could be obtained by taking the normalized
average gain <g> as a rough measure of the effectiveness of a course in promoting conceptual
understanding.
This inference was bolstered by the fact that the correlation of <g> with <Si> for the 62 survey courses
is a very low + 0.02. In contrast, the average posttest score <Sf> and the average gain <G> are less
suitable for comparing course effectiveness over diverse groups since their correlations with <Si> are,
respectively, + 0.55 and – 0.49. [It should be noted that a positive correlation of <Sf > with
<Si> would be expected in the absence of instruction.]
An "effect size, (d)"6 of a sort can be calculated from the averaged <<g>> values as follows:
d = [<<g>>48IE - <<g>>14T] / <SD> = (0.48 - 0.23)/0.09 = 2.78.......................(3)
where <SD> is the average of the standard deviations for the <g>IE and <g>T distributions =
(0.14 + 0.04)/2 = 0.09, for Interactive Engagement (IE) and Traditional (T) classes.
The average normalized gain <g> has become reasonably well established in the physics/astronomy
literature2-4, 7-12 as a sensible method of analyzing pre/post test results, even though most education
researchers have never heard of it and prefer to analyze data in terms of "effect sizes" and/or ANCOVA.
I have gone through the data tables of ref. 3 and calculated the d’s for all data for which SD’s were
reported. The results are:
<d>9T(N = 1620) = 0.88...........................................................................(4a)
<d>24IE (N = 1843) = 2.18...........................................................................(4b)
2
3. Eq. (4b) is comparable to the d = 1.91 reported by Zeilik et al.7a for a single introductory astronomy
course (N = 221) given in Spring 1995 at the University of New Mexico. The course employed IE
methods and achieved an average normalized gain <g>IE = 0.48.
It is interesting to compare the d = 2.78 of Eq. (3) with the lower d = 0.51 obtained in a meta-analysis of
small-group learning by Springer et al.13: "Based on 49 independent samples, from 37 studies
encompassing 116 separate findings, students who learned in small groups demonstrated greater
achievement (d=0.51) than students who were exposed to instruction without cooperative or
collaborative grouping."
In the Springer et al. study, as for much research reported in the educational literature, (a) in many cases
there was no pretesting to disclose initial knowledge states of the test or control groups, (b) the quality of
the "achievement tests" was not critically examined (were they of the plug-in-regurgitation type so
common in introductory physics courses?). I think that the Springer et al. meta-analysis probably
understates the effectiveness of cooperative learning in advancing conceptual understanding and
problem-solving ability.
It might be of considerable interest to analyze and compare the results of a single, large-N, pre/post
study in terms of normalized gain, effect size, and ANCOVA.
References and Footnotes
1. See, e.g., R.E. Slavin, Research Methods in Education (Allyn and Bacon, 2nd ed., 1992).
2. R.R. Hake, "Interactive-engagement vs traditional methods: A six-thousand-student survey of
mechanics test data for introductory physics courses," Am. J. Phys. 66, 64-74 (1998) and on the Web at
<http://carini.physics.indiana.edu/SDI/>, and also the Harvard Galileo server at
<http://galileo.harvard.edu/> under "Hands On Methods." See also refs. 3 and 4.
3. R.R. Hake, "Interactive-engagement methods in introductory mechanics courses," on the Web at
<http://carini.physics.indiana.edu/SDI/> and submitted on 6/19/98 to the Physics Education Research
Supplement to AJP ( for information on this new journal see
<http://www.physics.umd.edu/rgroups/ripe/perg/pers/>.
4. R.R. Hake, "Interactive-engagement vs Traditional Methods in Mechanics Instruction," APS Forum
on Education Newsletter, Summer 1998, p. 5-7, also at <http://carini.physics.indiana.edu/SDI/>. Some
criticisms of ref. 2 and of physics-education reform generally are countered.
5. D. Hestenes, M. Wells, and G. Swackhamer, "Force Concept Inventory," Phys. Teach. 30, 141-158
(1992). I. Halloun, R.R. Hake, E.P. Mosca, and D. Hestenes, Force Concept Inventory (Revised, 1995)
in E. Mazur, Peer Instruction: A User’s Manual (Prentice Hall, 1997) and also password protected at
<http://modeling.la.asu.edu/modeling.html>.
6. See, e.g., J. Cohen, Statistical Power Analysis for the Behavioral Sciences, ed. 2 (Erlbaum, 1988);
R.J. Light, J.D. Singer, and J.B. Willett, By Design: Planning Research on Higher Education, (Harvard
Univ. Press, 1990).
3
4. 7. (a) M. Zeilik, C. Schau, and N. Mattern, "Misconceptions and Their Change in University-Level
Astronomy Courses," Phys. Teach. 36(2), 104-107 (1998); (b) M. Zeilik, C. Schau, and N. Mattern,
S. Hall, K.W. Teague, and W. Bisard, "Misconceptions and Their Change in University-Level
Astronomy Courses," Am. J. Phys. 65(10), 987-996 (1997); (c) M. Zeilik, C. Schau, and N. Mattern,
"Conceptual Astronomy II: Replicating conceptual gains, Probing attitude changes across three
semesters" Am. J. Phys., in press, 1999. The latter paper analyzes pre/post test results in terms of both
normalized gain and effect size.
8. G.E. Francis, J.P. Adams, and E.J. Noonan, "Do They Stay Fixed?" Phys. Teach. 36(11), 488 (1998).
9. J. Bernhard, "Do They Stay Fixed?" to be submitted to Phys. Teach.; on the web at
<http://www.du.se/~jbe/fou/didaktik/papers/fixed.pdf>.
10. K. Cummings, J. Marx, R. Thornton, and D. Kuhl, "Innovations in Studio Physics at Rensselaer,"
Physics Education Research Supplement to AJP, in press.
11. E.F. Redish and R.N. Steinberg, "Teaching Physics: Figuring Out What Works," Phys. Today 52(1),
24-30 (1999), on the web at <http://www.physics.umd.edu/rgroups/ripe/papers/PT/pt.htm>.
12. E.F. Redish, "Millikan Award Lecture: Building a Science of Teaching Physics," Am. J. Phys., to
be published, on the web at <http://www.physics.umd.edu/rgroups/ripe/papers/millikan.htm>.
13. L. Springer, M.E. Stanne, and S. Donovan, "Effects of cooperative learning on undergraduates in
science, mathematics, engineering, and technology: A meta-analysis," (Research Monograph No. 11,
University of Wisconsin-Madison, National Institute for Science Education) Review of Educational
Research (in press, 1998); on the web at <http://www.wcer.wisc.edu/nise/CL1/resource/R2.htm>.
4