The Language of Variation: Variables - AP Statistics
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What is an operational definition of a variable?
What is an operational definition of a variable?
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A clear, precise description of how a variable will be measured. Ensures reproducible and valid measurement procedures.
A clear, precise description of how a variable will be measured. Ensures reproducible and valid measurement procedures.
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What type of variable is used to predict another variable?
What type of variable is used to predict another variable?
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Predictor variable. Also called an explanatory or independent variable.
Predictor variable. Also called an explanatory or independent variable.
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What term describes a variable used to divide data into groups?
What term describes a variable used to divide data into groups?
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Grouping variable. Used for comparative analysis between subgroups.
Grouping variable. Used for comparative analysis between subgroups.
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Identify a variable type that can influence both independent and dependent variables.
Identify a variable type that can influence both independent and dependent variables.
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Confounding variable. It creates a spurious relationship between variables.
Confounding variable. It creates a spurious relationship between variables.
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What is the purpose of a control variable?
What is the purpose of a control variable?
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To hold constant to prevent it from influencing the outcome. It eliminates potential sources of bias or variation.
To hold constant to prevent it from influencing the outcome. It eliminates potential sources of bias or variation.
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Define a continuous variable.
Define a continuous variable.
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A quantitative variable that can take on any value within a range. Examples include height, weight, or temperature.
A quantitative variable that can take on any value within a range. Examples include height, weight, or temperature.
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Define a discrete variable.
Define a discrete variable.
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A quantitative variable that takes on a finite number of values. Examples include number of children or cars owned.
A quantitative variable that takes on a finite number of values. Examples include number of children or cars owned.
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What type of variable represents ordered categories?
What type of variable represents ordered categories?
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Ordinal variable. Categories have a meaningful ranking or sequence.
Ordinal variable. Categories have a meaningful ranking or sequence.
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Identify a variable type that represents arbitrary labels.
Identify a variable type that represents arbitrary labels.
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Nominal variable. Categories have no meaningful order or ranking.
Nominal variable. Categories have no meaningful order or ranking.
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What is a quantitative variable?
What is a quantitative variable?
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A variable that can be measured numerically. Examples include height, weight, or test scores.
A variable that can be measured numerically. Examples include height, weight, or test scores.
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Identify the term for a variable that is manipulated in an experiment.
Identify the term for a variable that is manipulated in an experiment.
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Independent variable. The variable that the researcher controls or changes.
Independent variable. The variable that the researcher controls or changes.
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What is a variable in statistics?
What is a variable in statistics?
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A characteristic or attribute that can take on different values. This is the fundamental definition in statistics.
A characteristic or attribute that can take on different values. This is the fundamental definition in statistics.
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Define a latent variable.
Define a latent variable.
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A variable that is not directly observed but inferred. Examples include intelligence or happiness levels.
A variable that is not directly observed but inferred. Examples include intelligence or happiness levels.
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What type of variable cannot be measured directly?
What type of variable cannot be measured directly?
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Construct. Abstract concepts requiring multiple indicators to measure.
Construct. Abstract concepts requiring multiple indicators to measure.
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What is a moderator variable?
What is a moderator variable?
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A variable that affects the strength or direction of a relationship. It changes the relationship under different conditions.
A variable that affects the strength or direction of a relationship. It changes the relationship under different conditions.
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Differentiate between independent and dependent variables.
Differentiate between independent and dependent variables.
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Independent variables are manipulated; dependent variables are measured. Manipulation versus measurement distinguishes these roles.
Independent variables are manipulated; dependent variables are measured. Manipulation versus measurement distinguishes these roles.
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What is a dummy variable?
What is a dummy variable?
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A numerical variable used in regression analysis to represent categories. Converts categorical data into numerical form.
A numerical variable used in regression analysis to represent categories. Converts categorical data into numerical form.
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Differentiate between discrete and continuous variables.
Differentiate between discrete and continuous variables.
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Discrete variables are countable; continuous variables have infinite values. Countability distinguishes these two quantitative types.
Discrete variables are countable; continuous variables have infinite values. Countability distinguishes these two quantitative types.
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What defines a ratio variable?
What defines a ratio variable?
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A variable with equal intervals and a true zero point. Weight and height are common examples.
A variable with equal intervals and a true zero point. Weight and height are common examples.
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What term describes a variable used to divide data into groups?
What term describes a variable used to divide data into groups?
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Grouping variable. Used for comparative analysis between subgroups.
Grouping variable. Used for comparative analysis between subgroups.
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What is a composite variable?
What is a composite variable?
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A variable created from multiple other variables. Combines multiple measures into a single score.
A variable created from multiple other variables. Combines multiple measures into a single score.
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Differentiate between independent and dependent variables.
Differentiate between independent and dependent variables.
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Independent variables are manipulated; dependent variables are measured. Manipulation versus measurement distinguishes these roles.
Independent variables are manipulated; dependent variables are measured. Manipulation versus measurement distinguishes these roles.
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What is the role of a placebo in an experiment?
What is the role of a placebo in an experiment?
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To serve as a control to measure the effect of the treatment. Controls for psychological effects of receiving treatment.
To serve as a control to measure the effect of the treatment. Controls for psychological effects of receiving treatment.
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What is a moderator variable?
What is a moderator variable?
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A variable that affects the strength or direction of a relationship. It changes the relationship under different conditions.
A variable that affects the strength or direction of a relationship. It changes the relationship under different conditions.
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What term describes the variable being predicted in regression?
What term describes the variable being predicted in regression?
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Dependent variable. The outcome variable in predictive modeling.
Dependent variable. The outcome variable in predictive modeling.
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Identify the term for a variable that is manipulated in an experiment.
Identify the term for a variable that is manipulated in an experiment.
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Independent variable. The variable that the researcher controls or changes.
Independent variable. The variable that the researcher controls or changes.
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What is a quantitative variable?
What is a quantitative variable?
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A variable that can be measured numerically. Examples include height, weight, or test scores.
A variable that can be measured numerically. Examples include height, weight, or test scores.
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What is a binary variable?
What is a binary variable?
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A variable with only two possible values. Examples include pass/fail or yes/no responses.
A variable with only two possible values. Examples include pass/fail or yes/no responses.
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What is a variable in statistics?
What is a variable in statistics?
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A characteristic or attribute that can take on different values. This is the fundamental definition in statistics.
A characteristic or attribute that can take on different values. This is the fundamental definition in statistics.
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Identify a variable type that can influence both independent and dependent variables.
Identify a variable type that can influence both independent and dependent variables.
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Confounding variable. It creates a spurious relationship between variables.
Confounding variable. It creates a spurious relationship between variables.
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