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EXTERNAL VALIDITY: REPLICATION AND
GENERALIZATION
In the Discussion for this week, you evaluated possible confounding variables that could threaten
the internal validity of a study. For the Assignment, you will turn your attention to methods that
support the external validity of studies. You first learned about external validity in Chapter 4, which
refers to the extent to which a study’s findings can accurately be generalized to other populations
and settings. When the results of a research study are generalizable to additional populations and
settings, the study demonstrates external validity.
Replications of studies are essential to demonstrate both generalization and external validity. This
week, you will learn about two types of replication procedures—exact replication and conceptual
replication—and you will develop original examples of these two replication procedures with the goal
of demonstrating generalization and external validity.
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media.waldenu.edu/2dett4d/Walden/Canvas/Adobe/OrigImage-
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RESOURCES
To prepare:
Read Chapter 14.
Think of an original experimental study (i.e., do not use examples from the textbook or
found elsewhere) and develop a research question, hypothesis, and prediction.
Consider how other researchers interested in your topic would conduct an exact replication
and a conceptual replication of your study idea (i.e.: What elements would be the same and
which would be different?) and how the replications would be carried out.
Consider how the study idea could be carried out with another population and in another
setting to demonstrate the concepts of generalization and external validity.
Submit a 2-page paper that responds to the following:
For the original experimental study idea you created provide the following:
Research question
Hypothesis and prediction
Independent and dependent variables
Operational definitions for each variable
Be sure to review the Learning Resources before completing this activity.
Review previous chapters if you need to (e.g., Chapter 2 on
creating research questions and hypotheses, IV/DV, operational
definitions)
Cozby, P. C., & Bates, S. C. (2024). Methods in behavioral
research (15th ed.). McGraw Hill.
Chapter 14, “Generalization”
ShortCutsTV (Producer). (2016). Experimental design
( [Video] Alexander
Street.
Readings
Media
BY DAY 7
PSYC_3003_Week4_Assignment_Rubric
Next,
Explain what another researcher would need to know and do to conduct an exact replication
of your study idea (i.e.: What elements would be the same and which would be different?).
Explain how a different researcher could conduct a conceptual replication of your original
study and provide an example of how the replication would be carried out.
Propose how your initial experimental study idea could be conducted with a different
population or in a different setting to demonstrate generalization.
Applying your study idea, make the connection in your own words to explain how
replications relate to the concepts of generalization and external validity.
Note: Support your responses within your Assignment with evidence from the assigned
Learning Resources. Provide a reference list for resources you used for this Assignment. Use
APA style for in-text citations and references.
Before submitting your final assignment, you can check your draft for authenticity. To check
your draft, access the Turnitin Drafts from the Start Here area.
1. To submit your completed assignment, save your Assignment as
WK4Assgn_LastName_FirstInitial
2. Then, click on Start Assignment near the top of the page.
3. Next, click on Upload File and select Submit Assignment for review.
SUBMISSION INFORMATION
Criteria Ratings Pts
For the
original
experimental
study idea
created,
included are:
The research
question,
hypothesis &
prediction; the
independent
and
dependent
variables;
operational
definitions for
each variable.
10 pts
Explanation of
what another
researcher
would need to
know and do
to conduct an
exact
replication of
the study idea 10 pts
Explanation of
how a
10 pts
10 pts
A
Response is
complete and
accurate;
contains
sufficient
details and/or
explanation.
8.5 pts
B
Response is
complete and
mostly
accurate;
contains some
details and/or
explanation
7.5 pts
C
Response is
somewhat
complete
and/or is
somewhat
accurate;
and/or does
not contain
sufficient
details and/or
explanation.
6.5 pts
D
Response is
incomplete or
is mostly
inaccurate;
lacks sufficient
details and/or
explanation.
0 pts
F
Response is
incomplete or
not provided;
answers are
inaccurate
and/or not
explained.
10 pts
A
Response is
complete and
accurate;
contains
sufficient
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
8.5 pts
B
Response is
complete and
mostly
accurate;
contains some
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
7.5 pts
C
Response is
somewhat
complete
and/or is
somewhat
accurate;
and/or does
not contain
sufficient
details and/or
explanation;
includes some
supporting
information
from the
Learning
Resources.
6.5 pts
D
Response is
incomplete or
is mostly
inaccurate;
lacks sufficient
details and/or
explanation;
does not
include
supporting
information
from the
Learning
Resources.
0 pts
F
Response is
incomplete or
not provided;
answers are
inaccurate
and/or not
explained;
does not
include
supporting
information
from the
Learning
Resources.
10 pts
A
8.5 pts
B
7.5 pts
C
6.5 pts
D
0 pts
F
Criteria Ratings Pts
different
researcher
could conduct
a conceptual
replication of
the original
study and
provide an
example of
how the
replication
would be
carried out.
Proposal of
how the initial
experimental
study idea
could be
conducted
with a
different
population or
in a different
setting to
demonstrate
generalization
10 pts
Brief
explanation in
the student’s
words about
the
connection of
how
10 pts
Response is
complete and
accurate;
contains
sufficient
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
Response is
complete and
mostly
accurate;
contains some
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
Response is
somewhat
complete
and/or is
somewhat
accurate;
and/or does
not contain
sufficient
details and/or
explanation;
includes some
supporting
information
from the
Learning
Resources.
Response is
incomplete or
is mostly
inaccurate;
lacks sufficient
details and/or
explanation;
does not
include
supporting
information
from the
Learning
Resources.
Response is
incomplete or
not provided;
answers are
inaccurate
and/or not
explained;
does not
include
supporting
information
from the
Learning
Resources.
10 pts
A
Response is
complete and
accurate;
contains
sufficient
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
8.5 pts
B
Response is
complete and
mostly
accurate;
contains some
details and/or
explanation;
includes
supporting
information
from the
Learning
Resources.
7.5 pts
C
Response is
somewhat
complete
and/or is
somewhat
accurate;
and/or does
not contain
sufficient
details and/or
explanation;
includes some
supporting
information
from the
Learning
Resources.
6.5 pts
D
Response is
incomplete or
is mostly
inaccurate;
lacks sufficient
details and/or
explanation;
does not
include
supporting
information
from the
Learning
Resources.
0 pts
F
Response is
incomplete or
not provided;
answers are
inaccurate
and/or not
explained;
does not
include
supporting
information
from the
Learning
Resources.
10 pts
A
Response is
complete and
accurate;
contains
sufficient
details and/or
8.5 pts
B
Response is
complete and
mostly
accurate;
contains some
details and/or
7.5 pts
C
Response is
somewhat
complete
and/or is
somewhat
accurate;
6.5 pts
D
Response is
incomplete or
is mostly
inaccurate;
lacks sufficient
details and/or
0 pts
F
Response is
incomplete or
not provided;
answers are
inaccurate
and/or not
Criteria Ratings Pts
replications
relate to the
concepts of
generalization
and external
validity
applied to
study idea
Quality of
Writing
10 pts
explanation;
includes
supporting
information
from the
Learning
Resources.
explanation;
includes
supporting
information
from the
Learning
Resources.
and/or does
not contain
sufficient
details and/or
explanation;
includes some
supporting
information
from the
Learning
Resources.
explanation;
does not
include
supporting
information
from the
Learning
Resources.
explained;
does not
include
supporting
information
from the
Learning
Resources.
10 pts
A
Writing is clear
and organized
with few or no
errors in
mechanics,
usage,
grammar, or
spelling
(MUGS).
There is a
preponderance
of original
writing (i.e.,
use of own
words and
proper
paraphrasing).
Information
from the
Learning
Resources is
fully provided
and correctly
documented
with citation(s)
and
reference(s) in
correct APA
style.
8.5 pts
B
Writing is
mostly clear
and organized
with few
MUGS errors.
Writing is
original (i.e.,
use of own
words and
proper
paraphrasing).
Information
from the
Learning
Resources is
mostly
provided and
correctly
documented
with citation(s)
and
reference(s) in
correct APA
style.
7.5 pts
C
Writing is
somewhat
clear and
organized with
some MUGS
errors. Most
writing is
mostly original
(i.e., use of
own words
and proper
paraphrasing)
but may rely
on the use of
some direct
quotations.
Information
from the
Learning
Resources is
partially
provided
and/or
incorrectly
documented
with citation(s)
and/or
reference(s),
and/or
citations(s)
and
6.5 pts
D
Writing is
mostly unclear
and
disorganized
and/or
contains many
MUGS errors.
There is an
overuse of
direct
quotations
and/or
ineffective
paraphrasing.
Information
from the
Learning
Resources is
significantly
lacking and/or
is incorrectly
documented
and/or
citation(s) and
reference(s)
do not follow
correct APA
style.
0 pts
F
Writing is
mostly unclear
and/or mostly
disorganized
and/or
contains many
MUGS errors.
There is an
underuse of
original writing
and an
overuse of
directly quoted
content.
Information
from the
Learning
Resources is
absent and/or
is not cited or
referenced in
any way.
Criteria Ratings Pts
Total Points: 60
reference(s)
do not follow
correct APA
style.
