Question

Quantitative studies can be designed in many ways. Please explain the differences between and among the following:

a) experimental, quasi-experimental, and pre-experimental studies (be sure to discuss the concept and usage of a control group)

b) between-subjects and within-subjects studies

c) non and single and double-blind studies

After you differentiate between the above concepts, please upload the pdf of a study and explain how it might be different if one or more of the above were changed.

After you differentiate between the above concepts, please upload the pdf of a study and explain how it might be different if one or more of the above were changed.

upload a pdf study of a similar study to what you have discussed and explained the difference between the pdf and the concepts. you can upload any pdf online that relate to the above.

Answer 1

a).A true experiment or AN experiment can comprises subjects (representative of the population) that area unit
randomly elite and set to treatment cluster and management cluster. The experimenter cleverly controls
independent variables to look at any result on the variable. Any potential issue that will have an effect on
the variable area unit controlled in an exceedingly laboratory setting. as an example, AN experimenter needs to
observe the result of caffein on intelligence. The experiment ensures that alternative plausible factors like
nutritious level in subjects, physical activity in subjects, the sort of college the topic studies in, age, grade,
all these variables area unit controlled. These variables could have an effect on intelligence level within the subject.
A similar experimental study is nearly like AN experiment however not really AN experiment as a result of the themes
are not every which way assigned to the treatment cluster and management cluster. typically in experiments, the
experimenter are going to be unable to regulate bound variable, so such AN experiment becomes a similar
experimental study. as an example, AN experimenter needs to check the relation between sleep hours and
intelligence of an individual. He designedly assigns apnea patients to the treatment cluster and non
patients to the management cluster. This selective and non random assignment to teams is what makes it a similar
experimental study.
Pre-experimental studies area unit most simplest kind of experiments wherever the result of bound drug/ part
is ascertained in subjects post the administration of that drug/element. as an example doctors check to ascertain however a
certain antibiotic helps in digestion in humans. The doctor marks the digestion method within the subject
before the administration of antibiotic and conjointly records the {digestive|organic method|biological process} process post the administration of that
drug. This technique is barely a sort of pre-experimental style. there's a 1 cluster pre-experimental style
in which the experimenter records the information post the administration of drug.
b). Between subjects style is wherever every subject is appointed at random and is exposed to the input solely
once. as an example, associate degree experimenter is curious to examine whether or not adults between the age of 20-30 square measure additional
comfortable with double cushiony mattresses or single cushiony mattresses. every subject is appointed to
only one pad sort and their responses square measure recorded. The pad that yield the next response
value are often aforementioned to be lighter than the opposite.
In at intervals cluster subjects, every subject is appointed to each conditions. within the on top of example, a at intervals cluster
design would be once every subject is exposed to each mattresses and asked to match the comfort
level.
c). In run studies, each experimenter and therefore the subjects square measure unaware of what treatment are
received by that subject. this sort of experiment is conducted to avoid any reasonably bias among subjects
and experimenters. as an example, in studies that administer impact of drug and so embody administering
placebo on management cluster, the themes within the management cluster square measure unaware of that reality. once experimenters
are also unaware of that participant belongs to manage cluster and so is unaware on World Health Organization can receive
placebo, such associate degree experiment becomes a run study.
Single blind study happens once subjects ar unaware of what treatment they'll be assigned to or ar
unaware of what precisely is being tested. associate degree example for this kind of experiment are a study conducted
on impact of yellow wall color on student's attention in a very category. If students ar aware that their attention or
behaviour is that the topic of study, they'll try and alter it and therefore turn out incorrect knowledge for the experimenter.
To avoid such cases, single blind studies ar used wherever subjects ar fully unaware of what's being
tested.
Non blind studies ar wherever each subjects and also the experimenters ar attentive to what's being tested and
what is assigned to that cluster. as an example, a category take a look at that's conducted to watch that students
fares best in arithmetic.