Chapter 2: Research Methods Flashcards
operational definition
a carefully worded statement of the exact procedures used in a research study
replication
repeating the essence of a research study, usually with different participants in different situations, to see whether the basic finding can be reproduced
case study
a descriptive technique in which one individual or group is studied in depth in the hope of revealing universal principles
naturalistic observation
a descriptive technique of observing and recording behavior in naturally occurring situations without trying to manipulate or control the situation
survey
a descriptive technique for obtaining the self-reported attitudes or behaviors of a particular group, usually by questioning a representative, random sample of the group
sampling bias
a flawed sampling process that produces an unrepresentative sample
population
all those in a group being studied, from which samples may be drawn
hindsight bias
the tendency to believe, after learning an outcome, that one would have foreseen it
theory
an explanation using an integrated set of principles that organizes observations and predicts behaviors or events
hypothesis
a testable prediction, often implied by a theory
random sample
a sample that fairly represents a population because each member has an equal chance of inclusion
correlation
a measure of the extent to which two factors vary together, and thus of how well either factor predicts the other
correlation coefficient
a statistical index of the relationship between two things (from −1.00 to +1.00)
variable
anything that can vary and is feasible and ethical to measure
scatterplot
a graphed cluster of dots, each of which represents the values of two variables. The slope of the points suggests the direction of the relationship between the two variables. The amount of scatter suggests the strength of the correlation
illusory correlation
perceiving a relationship where none exists, or perceiving a stronger-than-actual relationship
regression toward the mean
the tendency for extreme or unusual scores or events to fall back toward the average
experiment
a research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process
experimental group
in an experiment, the group exposed to the treatment, that is, to one version of the independent variable
control group
in an experiment, the group not exposed to the treatment
random assignment
assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between the different groups
double-blind procedure
an experimental procedure in which both the research participants and the research staff are ignorant about whether the research participants have received the treatment or a placebo
placebo effect
experimental results caused by expectations alone; any effect on behavior caused by the administration of an inert substance or condition, which the recipient assumes is an active agent
independent variable
in an experiment, the factor that is manipulated; the variable whose effect is being studied
