Why will a researcher need more participants when there is a high degree of within-group variability? The scores are spread out within the groups, which makes it more difficult to see differences between groups.
What is the dependent variable being used in this experiment?
The dependent variable is
the variable that is being measured or tested in an experiment
. 1 For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants’ test scores, since that is what is being measured.
Why do participants use college students as their participants so frequently?
Why do participants use college students as their participants so frequently?
They are readily available for researchers
.
Why do the groups have to be equivalent at the start of an experiment?
Why do the groups have to be equivalent at the start of an experiment? ... If the groups are not equivalent at the start of an
experiment, we cannot be certain that the IV caused any difference observed in the DV
.
Why are participant characteristics not true independent variables?
Why are participant characteristics not true independent variables? Participant characteristics
are not manipulated by the researcher
. ... The researcher cannot be sure that all extraneous variables have been equally distributed across the groups.
What is the most reliable measure of variability?
The standard deviation
is the most commonly used and the most important measure of variability. Standard deviation uses the mean of the distribution as a reference point and measures variability by considering the distance between each score and the mean.
What is a limitation that affects the generalizability of research results?
What is the limitation that affects the generalizability of research results?
Small sample size
. Dr. Matter is interested in knowing more about brain injury to the occipital vortex, and he studies patients individually in order to gain in-depth knowledge about their behaviors.
What are some examples of independent and dependent variables?
Independent variable causes an effect on the dependent variable. Example:
How long you sleep (independent variable) affects your test score
(dependent variable). This makes sense, but: Example: Your test score affects how long you sleep.
What is an example of an independent variable?
It is a variable that stands alone and isn’t changed by the other variables you are trying to measure. For example,
someone’s age might
be an independent variable. Other factors (such as what they eat, how much they go to school, how much television they watch) aren’t going to change a person’s age.
What is a dependent variable in quantitative research?
Dependent variables are
variables that depend on or are influenced by the independent variables
. They are outcomes or results of the influence of the independent variable.
How do you identify a quasi experimental design?
Like a true experiment, a quasi-experimental design aims to establish a cause-and-effect relationship between an independent and dependent variable. However, unlike a true experiment, a quasi-experiment does not rely on random assignment. Instead,
subjects are assigned to groups based on non-random criteria
.
How does a control group increase validity?
Control groups help ensure
the internal validity of your research
. You might see a difference over time in your dependent variable in your treatment group. However, without a control group, it is difficult to know whether the change has arisen from the treatment.
How do you randomly allocate participants in psychology?
Random allocation is
when the researchers divide the participants and allocate them to certain groups using a random method
. For instance, in an experiment to test the effects of a new drug on depression the researchers might use a random number generator to assign their 25 participants a number from 1 – 25.
How do you manipulate independent variables?
Again, to manipulate an independent variable means
to change its level systematically
so that different groups of participants are exposed to different levels of that variable, or the same group of participants is exposed to different levels at different times.
How do you control participant variables?
Participant variables can be controlled
using random allocation to the conditions of the independent variable
.
What is a predictor variable?
Predictor variable is the
name given to an independent variable used in regression analyses
. The predictor variable provides information on an associated dependent variable regarding a particular outcome. ... At the most fundamental level, predictor variables are variables that are linked with particular outcomes.
