Making Predictions and Reading Scatterplots

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 correlation indicate in a scatterplot?

Back

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

Front

What does a negative correlation indicate in a scatterplot?

Back

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

Front

What does 'no correlation' mean in the context of a scatterplot?

Back

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

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 overall trend of the data points.

Front

How do you determine the line of best fit in a scatterplot?

Back

The line of best fit is determined by minimizing the distance between the line and all the data points, often using methods like least squares.

Front

What is the purpose of making predictions using a scatterplot?

Back

The purpose is to estimate the value of one variable based on the value of another variable, using the trend shown in the scatterplot.

Front

How can you use a scatterplot to predict the value for a specific data point?

Back

You can locate the specific value on the x-axis, find the corresponding point on the scatterplot, and read the predicted value on the y-axis.

Front

What does it mean if a scatterplot has no trend?

Back

If a scatterplot has no trend, it means the data points are scattered randomly, indicating no relationship between the variables.

Front

What is an example of a negative correlation in real life?

Back

An example of a negative correlation is the relationship between the number of days absent from school and a student's math grade.