psy chapter 2
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24 terms
Terms | Definitions |
|---|---|
 sample | the small group of participants, out of the total number available, that a researcher studies |
| naturalistic observation | research method in which the psychologist observes the subject in a natural setting without interfering |
| case study | research method that involves an intensive investigation of one or more participants |
| longitudinal study | research method in which data is collected about a group of participants over a number of years to assess how certain characteristics change or remain the same during development |
| cross-sectional study | research method in which data is collected from groups of participants of different ages and compared so that conclusions can be drawn about differences due to age |
| correlation | the measure of a relationship between two variables or sets of data |
| hypothesis | an educated guess about the relationship between two variables |
| variable | a quantity that can assume any of a set of values |
| experimental group | subjects in an experiment to whom the independent variable is administered |
| control group | the group that does not receive the experimental treatment. |
| self-fulfilling prophecy | A situation in which a researcher's expectations influence that person's own behavior, and thereby influence the participant's behavior |
| single-blind experiment | an experiment in which the participants are unaware of which participants received the treatment |
| double-blind experiment | an experiment in which neither the experimenter nor the participants know which participants received which treatment |
| placebo effect | a change in a participant's illness or behavior that results from a belief that the treatment will have an effect, rather than the actual treatment |
| statistics | the branch of mathematics concerned with summarizing and making meaningful inferences from collections of data |
| descriptive statistics | the listing and summarizing of data in a practical, efficient way |
| frequency distribution | an arrangement of data that indicates how often a particular score or observation occurs |
| normal curve | a graph of frequency distribution shaped like a symmetrical, bell-shaped curve; a graph of normal distribution |
| central tendency | a number that describes something about the "average" score of a distribution |
| variance | a measure of difference, or variance |
| standard deviation | a measure of variability that describes an average distance of every score from the mean |
| correlation coefficient | describes the direction and strength of the relationship between two sets of variables |
| inferential statistics | numerical methods used to determine whether research data support a hypothesis or whether results were due to chance |
| survey | research method in which information is obtained by asking many individuals a fixed set of questions |
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