Touro MPS620 Module 4 Discussion (dq1+dq2) Latest 2019 MAY Question # 00602419 Subject: Education Due on: 06/22/2019 Posted On: 06/22/2019 12:08 PM Tutorials: 1 Rating: 4.6/5
MPS620 Applied Research Methods and Statistics
Module 4 Discussion
DQ1 Case
Study: Identifying threats to Internal Validity and External Validity
1a. Based
on the assigned video, identify at least one threat to internal validity and at
least one threat to external validity from the research study provided below.
A
researcher compared the effectiveness of compressed versus distributed practice
in preparing for a memory test. The independent variable for the study was the
type of practice (compressed versus distributed practice) and the dependent
variable was the performance on the memory test. Each of two groups memorized
the definitions of 40 vocabulary words. In group A, there were 50 participants
who were all under twenty-five years of age. Participants in group A used the
method of distributed practice, studying for 30 minutes on each of four
evenings. They were all tested together on the fifth morning at 7:00 A.M at a
community college classroom. Due to the length of the study, over 4 evenings,
only 30 participants were able to be tested on the 5th morning at 7:00 A.M. In
group B, there were 50 participants who were all over sixty years of age.
Participants in group B used the method of compressed practice, studying only
from 6:30 P.M. to 8:30 P.M. on the evening before the test. They were tested
the next morning at 7:00 A.M at their individual homes. All participants
completed a recall test. The test measured how quickly participants recalled
the definitions of the vocabulary words. The results showed that the mean
difference between the distributed practice group and the compressed practice
group was statistically different from each other.
1b. Explain
how you would change the research study above to help reduce the threat to
internal validity that you had identified.
1c. Explain
how you would change the research study above to help reduce the threat to
external validity that you had identified.
DQ2 Reliability
If you were
going to design your own assessment measure of depression and you wanted to
publish it so that clinicians could use it to determine whether their clients
met criteria for depression, describe at least two types of reliability and two
types of validity that you would consider most important for your measure to
have and explain why. Please cite sources to support your points and respond to
at least one of your peer’s posts.
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