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Terms in this set (33)
having the power to establish or give organized existence to something
detail of the investigators manipulation of a variable; states which characteristics will be measured.
variables you are not intentionally studying in your experiment.
at least one independent variable is manipulated by the researcher and individuals are randomly assigned. Good at controlling the extraneous variable.
at least one independent variable is manipulated by the researcher; individuals are NOT randomly assigned
The researcher attempts to determine the cause, or reason, for existing differences in behavior of a group. There is more than 1 group.
2 or more quantitative variables from the same group. You are trying to determine if there is a relationship.
research that focuses on nonnumerical data, such as subjective experiences, feelings, or beliefs
Research that provides data that can be expressed with numbers, such as ranks or scales.
a procedure for statistically combining the results of many different research studies
a computed measure of how much scores vary around the mean score
a level of measurement in which numbers serve only to label categories of a variable
a measurement in which attributes are ranked by assigning numbers in ascending or descending order
a measurement in which the distance between scores on an attribute has meaning
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
the middle score in a distribution; half the scores are above it and half are below it
the most frequently occurring score(s) in a distribution
When a distribution includes an extreme score that is very high.
a distribution that trails off to the right
mean greater than median
When the skew is caused by an extremely low score;
a distribution that trails off to the left
measures the degree and the direction of the linear relationship between two variables
the difference between the highest and lowest scores in a distribution
investigators observe one group of participants repeatedly over a period of time
a relationship in which the dependent variable varies linearly with the independent variable example -.85
high variability in a group
single score used to represent a series of scores (mean)
the extent to which two measures of the same trait or ability agree- test scores
a tests ability to represent all content
different versions of a test used to assess test reliability
two alternative forms of a test
researcher attempts to determine the cause or reason for existing differences in behavior; includes more than one group.
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.