Statistics Vocabulary

A collection of key terms and definitions related to statistics crucial for understanding the subject.

Confirmation Bias

The tendency to favor information that confirms one’s preexisting beliefs or hypotheses.

Cultural Norms

Shared standards and patterns that guide behavior within a society.

Experimenter Bias

When a researcher’s expectations influence the outcome of a study.

Hindsight Bias

The tendency to see events as having been predictable after they have already occurred.

Overconfidence

Excessive confidence in one’s own answers, judgments, or knowledge.

Peer Review

The process of subjecting research to the scrutiny of others in the same field before publication.

Case Study

An in-depth analysis of an individual or group to explore a particular phenomenon.

Confidentiality

The ethical principle of keeping participant information private.

Confounding Variables

External factors that may affect study results, complicating the interpretation.

Control Group

A group in an experiment that does not receive the treatment being tested.

Cross-Sectional Study

Research that analyzes data from a population at a specific point in time.

Debriefing

Providing participants with a full explanation of the study after it has been conducted.

Deception Research

Research that involves misleading participants about some aspect of the study.

Dependent Variables

The outcomes measured in an experiment that are affected by independent variables.

Double-Blind Study

An experiment design where neither the participants nor the experimenters know who is receiving treatment.

Experimental Group

The group exposed to the treatment or independent variable in an experiment.

Falsifiability

The principle that a hypothesis must be able to be proven false through evidence.

Generalizability

The extent to which findings from a study can be applied to broader populations.

Hypothesis

A testable prediction about the relationship between variables.

Independent Variables

The variable that is manipulated to observe its effect on the dependent variable.

Informed Assent

Obtaining agreement from a participant who may not be able to give full informed consent.

Informed Consent

A process by which participants are made aware of the study's risks and benefits before agreeing to participate.

Institutional Review Board (IRB)

A committee that reviews research proposals to ensure ethical standards are met.

Likert Scales

A rating scale that measures attitudes or opinions on a range.

Longitudinal Study

Research that follows a group of individuals over a prolonged period.

Naturalistic Observation

Observing subjects in their natural environments without manipulation.

Operational Definitions

Specific explanations of abstract concepts that define how they will be measured.

Placebo

An inactive substance or treatment used as a control in an experiment.

Placebo Effect

Improvement resulting from the mere expectation of treatment.

Professional Ethics

Guidelines that govern the conduct of professionals.

Qualitative Research/Measures

Research that focuses on understanding phenomena through subjective assessment.

Quantitative Research/Measures

Research that focuses on quantifying relationships and phenomena.

Random Assignment

Assigning participants to experimental and control groups by chance.

Replication

The repeated trials of a study to confirm the results.

Single-Blind Study

An experiment where only the participants are unaware of group assignments.

Social Desirability Bias

The tendency for respondents to answer questions in a manner that will be viewed favorably by others.

Structured Interviews

Interviews where questions are pre-determined and asked in a specific order.

Survey

A research method for collecting data from a predefined group.

Theory

A well-substantiated explanation of an aspect of the natural world.

Validity

The degree to which a result accurately represents the concept it was intended to measure.

Bimodal Distribution

A frequency distribution with two different modes.

Central Tendency

Measures that summarize a set of data by identifying the central point within that dataset.

Correlation

A statistical measure that describes the extent to which two variables are related.

Correlational Research

Research that examines the relationship between two or more variables.

Correlation Coefficient

A statistical index that indicates the extent to which two variables change together.

Convenience Sampling

A non-probability sampling method where participants are selected based on their easy availability.

Directionality Problem

The challenge in determining which variable influences the other in a correlation.

Effect Size

A quantitative measure of the magnitude of a phenomenon.

Mean

The average of a set of values, calculated by dividing the sum by the number of values.

Median

The middle value when a data set is ordered from least to greatest.

Meta-Analysis

A statistical analysis that combines the results of multiple scientific studies.

Mode

The value that appears most frequently in a data set.

Negative Correlation

A relationship between two variables in which one variable increases as the other decreases.

Negative Skew

When the tail of a distribution is longer on the left side.

Normal Curve

A bell-shaped curve that represents the distribution of a set of data.

Percentile Rank

A statistical measure indicating the value below which a given percentage of observations fall.

Population

The entire group that is the subject of a statistical study.

Positive Correlation

A relationship between two variables in which both variables move in tandem.

Positive Skew

When the tail of a distribution is longer on the right side.

Random Sample

A subset of a population where each member has an equal chance of being selected.

Range

The difference between the highest and lowest values in a set of data.

Regression Toward the Mean

The phenomenon where extreme values tend to be closer to the average on subsequent measurements.

Representative Sample

A subset that accurately reflects the characteristics of the larger population.

Sampling Bias

Systematic error due to an unrepresentative sample.

Scatterplot

A graphical representation of two variables where each point represents an observation.

Skew

The asymmetrical distribution of data values.

Standard Deviation

A measure of the amount of variation or dispersion in a set of values.

Statistical Significance

The likelihood that a result or relationship is caused by something other than mere chance.

Third Variable Problem

The issue when a third variable affects both X and Y, misleading the apparent relationship between them.

Variation

The extent to which data points differ from each other.