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# Psychology- chapter2

Median Point that divides a distribution of scores in half when those scores are arranged in order from lowest to highest.
Meta-analysis Statistical procedure for combining the results of different studies that examine the same topic.
Mode Most frequently occurring score in a distribution.
Naturalistic Observation A method in which the researcher observes behavior in a natural setting and tries to avoid influencing the participants being observed.
Negative Correlation Higher scores on one variable are associated with lower scores on a second variable.
Operational Definition Defines a variable in terms of the specific procedures used to produce or measure it.
Placebo A substance that has no pharmacological effect.
Placebo Effect People receiving a treatment show a change in behavior because of their expectations, bot because the treatment itself had any specific benefit.
Population All the individuals that we are interested in drawing a conclusion about.
Positive Correlation Higher scores on one variable are associated with higher scores on a second variable.
Random Assignment A procedure in which participant has an equal likelihood of being assigned to any one group within an experiment.
Random Sampling Every member of the population has an equal probability of being chosen to participate in the survey.
Range Difference between the highest and lowest scores in a distribution.
Replication Process of repeating a study to determine whether the original findings can be duplicated.
Representative Sample Reflects the important characteristics of the population.
Sample A subset of individual individuals drawn from the larger population
Scatterplot A graph used to examine correlational data; each pair of scores on variable X and variable Y are plotted as a single point.
Standard Deviation How much each score in the distribution differs from the mean.
Statistical Significance Very unlikely that a particular finding occurred by chance alone.
Survey Research Information about a topic is obtained by administering questionnaires or interviews to many people.
Theory Set of formal statements that explains how and why certain events are related to one another.
Unobtrusive Measures Record behavior in a way that keeps participants unaware that are being observed.
Variable Any characteristic or factor that can vary.
Created by: Akile6