algebra unit 4 vocab

Scatter plot

A graph in the coordinate plane that reporter te a set of bivariate numerical data used to observe the relationship btw 2 variables

Residual

The difference btw the actual y-value of a point in a scatter plot and the y-value predicted by a linear model

Interpolation

Occurs when a model is used to make predictions for x values within a given data set

Correlation Coefficient r = 0

Represents no association

Outlier

A data value that is unusual in that it differs quite a bit from the other values in the data set

Extrapolation

Occurs when a model is used to make predictions for x-values that fall outside of a given data set

Correlation

The association between 2 sets of data

Line of Fit

A line drawn on a scatter plot to estimate the relationship between 2 sets of data

Numerical Data

Data that represents amounts or quantities that can be measured or counted

Correlation Coefficient r = -1

Represents a perfect negative linear association

Bivariate Data

Data that measures 2 characteristics of a population

Categorical Data

Data that describes characteristics or qualities, often in the form of categories or groups

Line of Best Fit

A trend line that most closely models the data on a scatter plot

Residual Plot

Graph that shows the residuals of the data from a given scatter plot and line of best fit

Correlation Coefficient |r| = 0.1–0.3

Represents a weak association

Association

A way to describe the form, direction, or strength of the relationship between the 2 variables in a bi tv

Causation

Can only be concluded if a controlled study or experiment was performed to establish a cause and effect relationship

Correlation coefficient of r= 1

Represents a perfect positive linear association

Correlation coefficient or r

Value that measure the strength and direction of the linear association between the variables in a set of bivaraite numerical data

Correlation coefficient from the absolute value of 0.4-0.6

Represents a moderate association

Correlation coefficient from the absolute value of 0.7-0.9

Represents a strong association