19 terms

univariate data

A single set of numbers

bivariate data

Data given as pairs of numbers and show a relationship between the pairs

scatterplot

A graph the shows the relationship of bivariate data using point on the coordinate grid

trend

A relationship that exists between the two variables in a bivariate data set

positive correlation

A relationship where the value of one variable increases as the value of the other variable decreases

negative correlation

When the value of one variable decreases as the value of the other variable increases

causal relationship

When one variable causes a change in another variable

explanatory variable

In a casual relationship, the variable which causes the change in another variable

response variable

In a causal relationship, the variable which is affected by the explanatory variable

line of best fit

A line that approximates the points on a scatterplot which can be used to show a trend and make predictions; also called a linear regression or least squares line

linear regression line

A line that approximates the points on a scatterplot which can be used to show a trend and make predictions; also called a line of best fit or least squares line

domain

The set of all first elements, (x-values) of ordered pairs

range

The set of second elements (y-values) that correspond with a set of x-values (domain).

extrapolation

To predict corresponding variables outside of the domain.

correlation coefficient

Represented by r, it is a number between -1 and 1, inclusive, that is used to judge how closely a line fits the data

strong correlation

Correlation coefficients with an absolute value greater than 0.75

weak correlation

Correlation coefficients with an absolute value less than 0.3

moderate correlation

Correlations that are not strong or weak

interpolation

To predict corresponding variables within the domain