Unit 8: Scatterplots and Associations

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 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

What does it mean if a scatterplot shows no relationship?

Back

It means that there is no discernible pattern or correlation between the two variables being plotted.

Front

How can you identify a linear association in a scatterplot?

Back

A linear association can be identified if the data points roughly form a straight line, either sloping upwards (positive) or downwards (negative).

Front

What is a non-linear association?

Back

A non-linear association occurs when the relationship between the variables cannot be accurately represented by a straight line.

Front

What is the purpose of the line of best fit?

Back

The purpose of the line of best fit is to summarize the relationship between the variables and make predictions based on the data.

Front

If Joe worked 30 hours and earned $600, what is his hourly wage?

Back

His hourly wage is $20 per hour.

Front

What does it mean if a scatterplot has a strong association?

Back

A strong association means that the data points are closely clustered around the line of best fit, indicating a reliable relationship between the variables.