Scatterplots

Front

What is a scatterplot?

Back

A scatterplot is a graph that displays values for typically two variables for a set of data. Each point represents an observation in the dataset.

Front

What does a line of best fit represent in a scatterplot?

Back

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

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or zero.

Front

What is the correlation coefficient?

Back

The correlation coefficient is a numerical value that ranges from -1 to 1, indicating the strength and direction of a linear relationship between two variables.

Front

What does a correlation coefficient of 0.90 indicate?

Back

A correlation coefficient of 0.90 indicates a strong positive correlation between the two variables.

Front

What does a correlation coefficient of -0.26 indicate?

Back

A correlation coefficient of -0.26 indicates a weak negative correlation between the two variables.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation indicates that one variable directly affects the other.

Front

How do you determine the strength of a correlation?

Back

The strength of a correlation is determined by the absolute value of the correlation coefficient: closer to 1 or -1 indicates a stronger correlation.

Front

What is the formula for the line of best fit?

Back

The formula for the line of best fit is typically expressed as y = mx + b, where m is the slope and b is the y-intercept.

Front

What does a positive correlation look like on a scatterplot?

Back

A positive correlation on a scatterplot appears as points that trend upwards from left to right.