AP Psychology Unit 0

hindsight bias

The tendency to believe, after learning an outcome, that one would have foreseen it-

"I knew it all along"

critical thinking

Is rationally deciding what to believe or what to do. When one rationally decides something, he or she evaluates information to see if it makes sense, whether it's coherent, and whether the argument is well founded on evidence.

validity

the extent to which a test or experiment measures or predicts what it is supposed to do

theory

A hypothesis that has been tested with a significant amount of data

hypothesis

A testable prediction, often implied by a theory

operational definition

A statement of the procedures used to define research variables

replication

replicate the original study

case study

An observation technique in which one person is studied in depth in the hope of revealing universal principles.

survey

A study, generally in the form of an interview or questionnaire, that provides researchers with information about how people think and act.

population

the whole group that you want to study and describe

random sample

A sample that fairly represents a population because each member has an equal chance of inclusion

Convenience sample

Convenience sampling involves using respondents who are "convenient" to the researcher. They may be recruited merely asking people who are present in the street, in a public building, or in a workplace, for example

sampling bias

flawed sampling process that produces an unrepresentative sample

naturalistic observation

Observing and recording behavior in naturally occurring situations without trying to manipulate and control the situation

correlation

A measure of the relationship between two variables

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.

illusory correlation

The perception of a relationship where none exists

experiment

A research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process

random assignment

Assigning participants to experimental and control conditions by chance, thus minimizing preexisting differences between those assigned to the different groups

double-blind study

An experiment in which neither the participant nor the researcher knows whether the participant has received the treatment or the placebo

placebo effect

Experimental results caused by expectations alone; any effect on behavior caused by the administration of an inert substance or condition, which is assumed to be an active agent.

experimental group

A subject or group of subjects in an experiment that is exposed to the factor or condition being tested.

control group

In an experiment, the group that is not exposed to the treatment; contrasts 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 than the independent variable that might produce an effect in an experiment.

dependent varibale

the outcome factor the variable that may change in response to manipulations of the independent variables --what you are measuring

mode

Measure of central tendency that uses most frequently occurring score.

mean

Average

median

A measure of center in a set of numerical data.

range

Distance between highest and lowest scores in a set of data.

standard deviation

A computed measure of how much scores vary around the mean score.

normal curve

the symmetrical bell-shaped curve that describes the distribution of many physical and psychological attributes. Most scores fall near the average, and fewer and fewer scores lie near the extremes.

statistical significance

A statistical statement of how likely it is that an obtained result occurred by chance

Quantitative measures

Data that is in numbers

Qualitative measures

Data not recorded in numerical form (example, open ended answers from an interview)

meta-analysis

a procedure for statistically combining the results of many different research studies

informed consent

A written agreement to participate in a study made by an adult who has been informed of all the risks that participation may entail.

debriefing

A verbal description of the true nature and purpose of a study

sample

A part of the population you are studying.

3 main components of scientific attitude

curiosity

skepticism

humility

wording effect of a survey

the way a question or situation is presented affects how people feel about the matter

positive correlation

two variable rise and fall together, such as height and weight

negative correlation

variables are related inversely, one goes up and the other goes down, such as inner speech and psychological distress

1 standard deviation

68%

2 standard deviations

95%

3 standard deviations

99%

descriptive statistics

numerical data used to measure and describe characteristics of groups, including measures of central tendency and variation

measures of central tendency

refers to how the data measures the center of a set of data

positive skew

high outlier

negative skew

low outlier

inferential statistics

numerical data that allows one to generalize (T-tests, chi square, ANOVAS)

statistically significant

how likely it is that an obtained result occurred by chance (p-value)

effect sizes

A large effect size means that a research finding has practical significance, while a small effect size indicates limited practical applications.

ethics in research

informed consent

protection from harm/discomfort

maintain confidentiality

debriefing