Scatterplots and Data

Front

What is a scatterplot?

Back

A scatterplot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

Front

What does a positive association in a scatterplot indicate?

Back

A positive association indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative association in a scatterplot indicate?

Back

A negative association indicates that as one variable increases, the other variable tends to decrease.

Front

What does it mean if there is no association in a scatterplot?

Back

No association means that there is no discernible relationship between the two variables; changes in one do not affect the other.

Front

How can you estimate values using a scatterplot?

Back

You can estimate values by finding the corresponding point on the trend line or by visually interpreting the data points.

Front

What is a trend line?

Back

A trend line is a straight line that best represents the data on a scatterplot, showing the general direction of the data.

Front

What is the purpose of using a scatterplot?

Back

The purpose of using a scatterplot is to visually analyze the relationship between two variables and identify patterns or trends.

Front

How do you interpret the slope of a trend line?

Back

The slope of a trend line indicates the rate of change between the two variables; a steeper slope means a greater rate of change.

Front

What is the equation of a trend line?

Back

The equation of a trend line is typically in the form y = mx + b, where m is the slope and b is the y-intercept.

Front

What does the y-intercept represent in a trend line equation?

Back

The y-intercept represents the value of y when x is zero; it is where the trend line crosses the y-axis.