Scatter plots and lines of best fit

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

Front

What does a line of best fit represent in a scatter plot?

Back

A line of best fit is a straight line that best represents the data points in a scatter plot, indicating the trend of the data.

Front

What is a positive residual?

Back

A positive residual occurs when the predicted value is less than the observed value, indicating that the model underestimates the actual outcome.

Front

What is a negative residual?

Back

A negative residual occurs when the predicted value is greater than the observed value, indicating that the model overestimates the actual outcome.

Front

How do you calculate a residual?

Back

Residual = Observed value - Predicted value.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no correlation between the variables, meaning there is no predictable relationship.

Front

What does a positive correlation look like in a scatter plot?

Back

A positive correlation in a scatter plot shows that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation look like in a scatter plot?

Back

A negative correlation in a scatter plot shows that as one variable increases, the other variable tends to decrease.

Front

What is the purpose of a line of best fit?

Back

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

Front

What is the formula for a linear equation in slope-intercept form?

Back

The formula is y = mx + b, where m is the slope and b is the y-intercept.