3710 exam 2
Experimental design ADVANTAGES.
-Establish causal relationships
-Random assignment rules out most of alternative explanations -Isolate the impact of
the independent variable
mean
Summing up all the observations and dividing by the number of observations
random assignment
assigning participants to experimental and control conditions by chance, thus
minimizing preexisting differences between those assigned to the different groups
Causality
Meaningful Temporal Control
Mode
It is the value that occurs most often
median
it is the middle value in an ordered set of numbers
reject means
that there is a difference
Fail to reject means
that there isn't enough evidence
Experimental design CHALLENGES.
-Sometimes not feasible to do so
-Not suitable for all research questions
-Ethical concerns
what is ONE experimental design challenges?
Researcher needs to be able to manipulate the independent variable and sometimes
not able to do so.
controlled group
group in an experiment that is exposed to the same conditions as the experimental
group except for one independent variable
independent variable
The experimental factor that is manipulated; the variable whose effect is being
studied.
Treatment and control groups
A control group is used as a baseline measure. The control group is identical to all
other items or subjects that you are examining with the exception that it does not
receive the treatment or the experimental manipulation that the treatment group
receives.
this is false about sampling
it is more precise than a census for estimating population parameters.
is a census more precise for estimating population parameters?
yes
why do we need sampling?
, Census
study that includes data from every member of the population
target population
the entire population that a researcher is interested in studying. so who you want to
study
how do you define the target population?
Decide who will be excluded. Characteristics to be considered are: geographic area,
demographic characteristics, product/service usable characteristics, and awareness.
Please indicate which would be the correct test for the following research question:
UNT wants to know whether the same group of Marketing students' attendance
changes before and after the classes become fully in person.
Paired sample t-test
Please indicate which would be the correct test for the following research question:
Starbucks wants to know if consumer satisfaction is different between the Denton
store and the Frisco store. Starbucks uses the following scale to measure consumer
satisfaction:
"Overall, how satisfied are you with your experience at this Starbucks store? 1 = very
dissatisfied, 9 = very satisfied"
Independent sample t-test
Please indicate which would be the correct test for the following research question:
Lululemon wants to know whether the average in-store spending for each consumer
is significantly higher than $50.
One sample t-test
Comparing the average scores of two different groups of students, where the groups
are unrelated (e.g., Group A took a different test than Group B).
this is?
indenpendent t-test
It is used when comparing the means of two independent (unrelated) groups to
determine if there is a statistically significant difference between them.
Independent t-test:
This test is appropriate when you have paired or matched observations, such as
when the measurements are taken on the same subjects before and after some
treatment.
Paired sample t-test:
Testing whether there is a significant difference in the blood pressure of individuals
before and after a certain treatment
Paired sample t-test:
Used when you want to compare the mean of a single sample to a known value or
theoretical population mean.
One-sample t-test:
Testing whether the average height of a sample of people is significantly different
from the national average height.
One-sample t-test:
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