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experimental psychology
the study of behavior and thinking using the experimental method
psychology
the science of behavior and mental processes
hindsight bias
the tendency to believe, after learning an outcome that one would have foreseen it (also known as I-knew-it-all-along phenomenon)
critical thinking
thinking that does not blindly accept arguments and conclusions. Rather, it examines assumptions, discerns hidden values, evaluates evidence, and assesses conclusions
hypothesis
a testable prediction, often implied by a theory
operational definition
a carefully worded statement of the exact procedures (operations) used in a research study. For example, human intelligence may be operationally defined as what an intelligence test measures
replication
repeating the essence of a research study, usually with different participants in different situations, to see whether the basic finding extends to other participants and circumstances
case study
an observation technique in which one person is studied in depth in the hope of revealing universal principles
survey
a technique for ascertaining the self-reported attitudes or behaviors of a particular group, usually by questioning a representative, random sample of a group
population
all the cases in a group being studied, from which samples may be drawn
random sample
a sample that fairly represents a population because each member has an equal chance of inclusion
naturalistic observation
observing and recording behavior in naturally occurring situations without trying to manipulate and control the situation
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 to +1)
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 (little scatter indicates high correlation).
experiment
a research method in which an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable). By random assignment of participants, the experimenter aims to control other relevant factors
random assignment
assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between those assigned to the different groups
double-blind procedure
an experimental procedure in which both the research participants and the research staff are ignorant (blind) about whether the research participants have received the treatment or a placebo. Commonly used in drug-evaluation studies.
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
experimental group
in an experiment, the group that is exposed to the treatment, that is, to one version of the independent variable
control group
in an experiment, the group that is not exposed to the treatment; contracts with the experimental group and serves as a comparison for evaluating the effect of the treatment
independent variable
the experimental factor that is manipulated; the variable whose effect is being studied
confounding variable
a factor other that the independent variable that might produce an effect in an experiment
dependent variable
the outcome factor; the variable that may change in response to manipulations of the independent variable
mode
the most frequently occurring score(s) in a distribution
mean
the arithmetic average if a distribution, obtained by adding the scores and then dividing by the number of scores
median
the middle score in a distribution; half the scores are above and half are below
range
the difference between the highest and lowest scores in a distribution
standard deviation
a computed measure of how much scores vary around the mean score
normal curve (normal distribution)
a symmetrical, bell-shaped curve that describes the distribution of many types of data; most scores fall near the mean (68% fall within one standard deviation of it) and fewer and fewer near the extremes
informed consent
an ethical principle that research participants be told enough to enable them to choose whether they wish to participate
debriefing
the post-experimental explanation of a study, including its purpose and any deceptions, to its participants
sampling bias
a flawed sampling process that produces an unrepresentative sample
regression toward the mean
the tendency for extreme or unusual scores to fall back (regress) toward the average.
skewed distribution
a representation of scores that lack symmetry around their average value
statistical significance
a statistical statement of how likely it is that an obtained result occurred by chance
Informed assent
bimodal distribution
A frequency distribution having two different values that are heavily populated with cases
confederate
In an experimental situation, an aide of the experimenter who poses as a participant but whose behavior is rehearsed prior to the experiment.
confidentiality
A principle of professional ethics requiring researchers to limit the disclosure of research participants and survey respondents' identity and any unique data collected during a study.
confirmation bias
A tendency to search for information that supports our preconceptions and to ignore or distort contradictory evidence
convenience sampling
Any process for selecting a sample of individuals or cases that is neither random nor systematic but rather is governed by chance or ready availability. Data obtained from this method do not generalize to the larger population as there may be significant bias.
cultural norm
A societal rule, value, or standard that delineates an accepted and appropriate behavior within a culture.
deception
Any distortion of or withholding of fact with the purpose of misleading others.
descriptive statistics
Statistical techniques used to summarize and describe the characteristics or properties of a dataset, such as measures of central tendency and variability.
directionality problem
In correlational research, the situation in which it is known that two variables are related although it is not known which is the cause and which is the effect.
effect size
The strength of the relationship between two variables. The larger the effect size, the more one variable can be explained by the other
ethical guidelines
Rules of acceptable conduct that members of a given profession are expected to follow
experiment(al)
A research method in which an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable).
experimenter bias
Occurs when a researcher's expectations or preferences about the outcome of a study influence the results obtained
falsifiable/falsifiability
The principle that for a hypothesis or theory to be considered scientific, it must be possible to conceive of evidence that would prove it false.
generalizability
Degree to which a study's findings based on a sample apply to the entire population (provided the sample is representative and large enough)
inferential statistics
Statistical techniques used to make inferences or predictions about a population based on sample data, including hypothesis testing and estimation.
informed assent
The agreement of someone not able to give legal consent to participate in the activity. Work with children or adults not capable of giving consent requires the consent of the parent or legal guardian and the ___________ of the subject.
Institutional Review Board (IRB)
A committee at each college/university where research is conducted to review every experiment for ethics and methodology.
meta-analysis
A procedure for statistically combining the results of many different research studies
negative correlation
A relationship between two variables in which the value of one variable increases as the value of the other decreases.
negative skew
The degree to which a set of scores, measurements, or other numbers are asymmetrically distributed with a majority toward the high end of the distribution with a few extreme scores toward the low end.
non-experimental
Research in which the investigator cannot randomly assign units or participants to conditions, cannot generally control or manipulate the independent variable, and cannot limit the influence of extraneous variables. Includes corrlation, meta-analysis, case study and naturalistic observations.
participant bias
A tendency for research participants to respond in a certain way because they know they are being observed, they believe they know if they are receiving treatment or a placebo, or they believe they know what the researcher wants
peer review
The evaluation of scientific, academic, or professional work by others in the same field to ensure its quality and validity before publication or presentation.
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
placebo group
Any group that receives any medical or psychological intervention or treatment that is believed to be "inert," thus making it valuable as a control condition against which to compare the intervention or treatment of interest.
population
All the cases in a group being studied, from which samples may be drawn. (Represented by uppercase N)
positive correlation
A relationship between two variables in which both rise and fall together.
positive skew
The degree to which a set of scores, measurements, or other numbers are asymmetrically distributed with a majority toward the low end of the distribution with a few extreme scores toward the high end.
protection from harm
Reasonable steps taken to avoid and minimize adverse effects for research participants where it is foreseeable and unavoidable.
qualitative research methods
Research that focuses on gathering and analyzing non-numerical data, such as observations, interviews, or textual analysis, to understand meanings, experiences, or perspectives.
quantitative research methods
Research that focuses on gathering and analyzing numerical data to understand relationships, patterns, or trends.
random assignment
Assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between those assigned to the different groups
random sampling
A portion that fairly represents a population because each member has an equal chance of inclusion is a:
regression toward the mean
The tendency for extreme or unusual scores to fall back (regress) toward the average.
reliability
The ability of a test to yield very similar scores for the same individual over repeated testings (consistency).
replication
Repeating the essence of a research study, usually with different participants in different situations, to see whether the basic finding extends to other participants and circumstances.
representative sample
the selection of study units (e.g., participants, homes, schools) from a larger group (population) in an unbiased way, such that the sample obtained accurately reflects the total population.
sample
"A relatively small proportion of people who are chosen in a study so as to be representative of the whole.
self-report bias
Inaccuracies or distortions in responses to surveys or questionnaires due to factors such as social desirability, memory recall, or misunderstanding of questions.
single-blind study
Research design in which participants don't know whether they are in the experimental or control group.
skewed distribution
A distribution of data in which the scores cluster more towards one end or the other end of the range, rather than being evenly distributed.
social desirability bias
A tendency to give socially approved answers to questions about oneself.
survey
A technique for ascertaining the self-reported attitudes or behaviors of a particular group, usually by questioning a representative, random sample of a group.
third variable problem
An undiscovered causative variable. When a relationship is found between variables x and y, variable x may erroneously be thought to be the cause of y. However, the cause of y may be a hidden variable z that is correlated with variable x.
validity
The ability of a test to measure what it is intended to measure (accuracy)
variation
The square of the standard deviation (gives the same information as standard deviation in that it tells how spread out the data are)
wording effects
When a specific word used in a question affects how respondents answer the question or the order of the questions
effect size
Any of various measures of the magnitude or meaningfulness of a relationship between two variables.
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