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An explanation of a correlation between two variables in terms of another variable that could possibly be responsible for the observed relationship between the two variables.
ThirdVariable problem.

An inverse relationship between two variables
Negative correlation

A control measure in an experiment in which participants are randomly assigned to groups in order to equalize participant characteristics across the various groups in the experiment.
Random assignment

A description of the operations or procedures that a researcher uses to manipulate or measure a variable
Operational definition

Statistical analyses that allow researchers to draw conclusions about the results of a study by determining the probability the results are due to random variation (chance).
Inferential statistical analyses

A research perspective whose major explanatory focus is how mental process, such as perception, memory, and problem solving, work and impact on behavior
Cognitive perspective

A research perspective whose major explanatory focus is how external environmental events condition observable behavior.
Behavioral perspective

A research perspective whose major explanatory focus is how other people and the cultural context impact on behavior and mental processees.
Sociocultural perspective

Research methods whose main purpose is to provide objective and detailed descriptions of behavior and mental processes
Descriptive methods

A statistic that tells us the type and the strength of the relationship between two variables. The sign of the coefficient (+ or ) indicates the type of correlation positive or negative, respectively. The absolute value of the coefficient (0.0 to 1.0) represent the strength of the coreelation, with 1.0 being the maximum strength.
Correlation coefficient

Statistics that describe the results of a research stud in a concise fashion
Descriptive statistics

A depiction, in a table or figure, of the number of participants (frequency) receiving each score for a variable.
Frequency distribution

Which of the following correlation coefficients indicates the STRONGEST relationship?
a. +.75
b. .81
c. +1.25
d. 0.00
 b. .81
 * absolute value of the coefficient represents the strength o fthe correlation.

Which of the following types of scatterplots depicts a weak, negative correlation?
a. A lot of scatter with data points going from top left to bottom right
b. very little scatter with data points going from top left to bottom right
c. a lot of scatter with data points going from bottom left to top right
d. very litle scatter with data points going from bottom left to top right
a. A lot of scatter with data points going from top left to bottom right
* 점이 많을수록 약하다! 점이 적으면 한줄이 되니까 강하단 증거

