Scatterplots and trend lines

ordered pair

(x,y)

scatterplot

A graphed cluster of dots, each of which represents the values of two variables

trend line

A line on a scatterplot that helps show the correlation between data sets more clearly. It is used to make predictions. It is also called a line of best fit.

negative correlation (definition & graph)

Data points that go generally downward from left to right

positive correlation (definition & graph)

Data points that go generally upward from left to right

line of best fit

a line drawn in a scatter plot to fit most of the dots and shows the relationship between the two sets of data. It is used to make predictions. It is also called a trend line.

prediction

a logical guess of one variable when given information about the other variable.

dependent variable

a variable whose value depends on the independent variable. the y.

independent variable

a variable whose values are independent of changes in the values of other variables. the x. The value we can choose.

no correlation (definition & graph)

there is no relationship between two variables (like your height and the month you were born)