Scatter Plots and Line of Best Fit

Front

What is a scatter plot?

Back

A scatter plot 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 the line of best fit represent in a scatter plot?

Back

The line of best fit is a straight line that best represents the data on a scatter plot. It shows the trend of the data points and can be used for predictions.

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

Define positive correlation.

Back

Positive correlation means that as one variable increases, the other variable also tends to increase.

Front

Define negative correlation.

Back

Negative correlation means that as one variable increases, the other variable tends to decrease.

Front

What does a correlation coefficient of 1 indicate?

Back

A correlation coefficient of 1 indicates a perfect positive correlation between two variables.

Front

What does a correlation coefficient of -1 indicate?

Back

A correlation coefficient of -1 indicates a perfect negative correlation between two variables.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no correlation between the two variables.

Front

What is a residual plot?

Back

A residual plot is a graph that shows the residuals on the vertical axis and the independent variable on the horizontal axis. It helps to assess the fit of a regression model.

Front

What does it mean if a residual plot shows a random pattern?

Back

If a residual plot shows a random pattern, it suggests that a linear model is appropriate for the data.