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Terms in this set (33)
constitutive
having the power to establish or give organized existence to something
operational
detail of the investigators manipulation of a variable; states which characteristics will be measured.
extraneous variables
variables you are not intentionally studying in your experiment.
True Experiment
at least one independent variable is manipulated by the researcher and individuals are randomly assigned. Good at controlling the extraneous variable.
quasi-experiment
at least one independent variable is manipulated by the researcher; individuals are NOT randomly assigned
casual-comparative
The researcher attempts to determine the cause, or reason, for existing differences in behavior of a group. There is more than 1 group.
Correlational
2 or more quantitative variables from the same group. You are trying to determine if there is a relationship.
qualitative research
research that focuses on nonnumerical data, such as subjective experiences, feelings, or beliefs
quantitative research
Research that provides data that can be expressed with numbers, such as ranks or scales.
meta-analysis
a procedure for statistically combining the results of many different research studies
standard deviation
a computed measure of how much scores vary around the mean score
nominal measurement
a level of measurement in which numbers serve only to label categories of a variable
ordinal measurement
a measurement in which attributes are ranked by assigning numbers in ascending or descending order
interval measurement
a measurement in which the distance between scores on an attribute has meaning
ratio measurement
a measure for which the scores possess the full mathematical properties of the numbers assigned; shows rankings of events or variables on scales with equal intervals and absolute variables; highest measurement
mean
average score
median
the middle score in a distribution; half the scores are above it and half are below it
mode
the most frequently occurring score(s) in a distribution
positively skewed
When a distribution includes an extreme score that is very high.
a distribution that trails off to the right
mean greater than median
negatively skewed
When the skew is caused by an extremely low score;
a distribution that trails off to the left
pearson correlation
measures the degree and the direction of the linear relationship between two variables
Range
the difference between the highest and lowest scores in a distribution
longitudinal design
investigators observe one group of participants repeatedly over a period of time
linear relationship
a relationship in which the dependent variable varies linearly with the independent variable example -.85
high correlation
high variability in a group
central tendancy
single score used to represent a series of scores (mean)
concurrent validity
the extent to which two measures of the same trait or ability agree- test scores
content validity
a tests ability to represent all content
parallel forms
different versions of a test used to assess test reliability
two alternative forms of a test
casual comparison
researcher attempts to determine the cause or reason for existing differences in behavior; includes more than one group.
correlation research
research that seeks to identify whether an association or relationship between two factors exists and only 1 group
cross sectional design
research design that examines people of different ages at a single point in time
standard error of measurement
small to range the greater precision of assessment; can't have a negative SEM; Must be greater than or equal to 0.
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