Scatterplots and Linear Regression

Front

What is a scatterplot?

Back

A scatterplot is a type of graph that shows the relationship between two different things by plotting points on a grid.

Front

What does it mean if a scatterplot has a positive correlation?

Back

It means that as one thing increases, the other thing also increases.

Front

What does it mean if a scatterplot has a negative correlation?

Back

It means that as one thing increases, the other thing decreases.

Front

What is linear regression?

Back

Linear regression is a way to find a straight line that best represents the data points on a scatterplot.

Front

What is the line of best fit?

Back

The line of best fit is the straight line that best represents the data in a scatterplot.

Front

What does the slope of a line in a linear regression equation represent?

Back

The slope shows how much one variable changes when the other variable changes.

Front

If the slope is 1.5, what does that mean?

Back

It means that for every increase of 1 in the x value, the y value increases by 1.5.

Front

What is the y-intercept in a linear equation?

Back

The y-intercept is the point where the line crosses the y-axis.

Front

How can you use a scatterplot to make predictions?

Back

You can look at the trend in the scatterplot to guess the value of one variable based on the value of another.

Front

What is an example of a positive correlation?

Back

An example is the relationship between the length of a running start and the distance of a jump.