Question

How does sensitization threaten the external validity of research findings?

Explain how using college students as participants in a study may limit the external validity of a study's research findings.

What is the novelty effect, and how does it affect a study's external validity?

Answer #1

Sensitization does threaten the external validity of research findings because the results of the study may be obtained by the participants who have already experienced a pre-test. Sensitization hugely impacts the results of the study.

Using college students as participants in a study may limit the external validity of a study's research findings because the researcher can not generalize the results on the population on the basis of information collected from college students.

Novelty effect occurs when the results of a study are obtained due to newness of the treatment. It may pose threat to extternal validity as it will be difficult to determine whether the results came from the actual treatment or newness of the treatement.

External validity is defined as:
Group of answer choices
the extent to which a specific intervention produces a
beneficial effect under ideal conditions
the degree to which a study is free from bias or systematic
error
a measure of the extent to which an intervention, when deployed
in the field under usual circumstances does what it is intended to
do for a specified population
the degree to which a study may apply or be generalized to
populations or groups who...

PART 1:
Sampling
How we select our sample will directly influence the
external validity of the study. If a sample is
representative, then our external validity
is stronger. If a sample is non-representative, then our external
validity is weaker.
QUESTIONS:
1.
You are interested in looking at the relationship between
student-to-teacher ratio and GPA at California 2- and 4-year
colleges. You suspect that average GPA is higher at 2-year colleges
where student-to-teacher ratio is low, relative to 4-year colleges
colleges...

6) Approximately how many research participants would be
required for 80% power for a study using the t test for dependent
means (assume a one-tailed hypothesis with an expected medium
effect size of .50):
Select one:
a. 33
b. 26
c. 12
d. 196

If you were a participant in Milgram’s research on conformity,
how far do you think you would go in carrying out orders? Do you
see a problem with the experimenter’s manipulation of the control
subjects? What can you conclude from his experiment, and how can
you use this information?
A few questions to keep in mind when addressing this weeks’
topic:
Stanley Milgram’s Obedience Study
http://en.wikipedia.org/wiki/Milgram_experiment
How was this study conducted? What was the purpose of the study?
What were...

What were the main findings of this research (i.e., did
the analyses support or fail to support the researchers’
hypotheses?). (The answer to this question can be found by reading
the “Discussion” section of the article, especially the first few
paragraphs).
and this is the Discussion :
Today’s students are quite different than those who populated
university classrooms at the turn of the century. Raised in the
internet age, constantly “plugged in”, seemingly inextricably
attached to cell phones, and facile...

A study is done to determine how much college students enjoy the
song "The Box" by Roddy Ricch. 25 of Stone's JWU students are
surveyed and asked to rate the song on a scale of 1-5 where 1 means
you hate the song and 5 means you love it. Tell me the
following:
1) The population of the study.
2) The sample of the study.
3) What type of data this is - Nominal, Ordinal, Interval, or
Ratio? Explain why.

A student organization wondered how many hours per week college
students study during a term. The organization obtained a list of
all students at their university and randomly selected 100 from the
list. They contacted all 100 students and all 100 provided their
best estimate of the number of hours they typically study per week.
A 95% confidence interval for the mean number of hours studied per
week was constructed. Based on this study, to what population can
we make...

A study considers how the college entrace exam scores
for students in 2018
compared to that of the students in 1988. The national
mean score in 1988 in 500 (out of
1000 possible points). Based on a simple random sample
of 10,000 students, the 2018
sample mean socre is 497 (out of 1000 possible points),
and the standard deviation s=100.
1.1 State the null and the alternative hypotheses, and
explain your reasoning for choosing an one-sided or a two-sided
test....

A class survey in a large class for first-year college students
asked, "About how many hours do you study during a typical week?"
The mean response of the 468 students was x = 15.3 hours. Suppose
that we know that the study time follows a Normal distribution with
standard deviation σ = 8.5 hours in the population of all
first-year students at this university.
Regard these students as an SRS from the population of all
first-year students at this university....

A class survey in a large class for first-year college students
asked, "About how many minutes do you study on a typical
weeknight?" The mean response of the 284 students was x⎯⎯⎯x¯ = 138
minutes. Suppose that we know that the studey time follows a Normal
distribution with standard deviation σσ = 65 minutes in the
population of all first-year students at this university. Regard
these students as an SRS from the population of all first-year
students at this university....

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