Scatterplots and trendlines

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 grid.

Front

What does a strong positive correlation in a scatterplot indicate?

Back

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

Front

What is a line of best fit?

Back

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

Front

How do you determine the slope of a line of best fit?

Back

The slope of a line of best fit is determined by the change in the y-values divided by the change in the x-values between two points on the line.

Front

What does a negative correlation in a scatterplot indicate?

Back

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

Front

What is the purpose of using a trendline in a scatterplot?

Back

A trendline helps to visualize the overall direction of the data and can be used to make predictions about future data points.

Front

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

Back

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

Front

How can you use a scatterplot to make predictions?

Back

You can use a scatterplot and the line of best fit to estimate the value of one variable based on the value of another variable.

Front

What is the mean of the data set: 15, 20, 25, 17, 18?

Back

The mean is 19.

Front

What does a weak positive correlation look like on a scatterplot?

Back

A weak positive correlation shows a slight upward trend, but the data points are more spread out and less clustered around the line of best fit.