Lines of Best Fit

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 scatter plot, showing the trend of the data points.

Front

How do you find the y-intercept in the equation y=mx+b?

Back

The y-intercept is the value of y when x=0, represented by the constant b in the equation.

Front

In the equation y=3x-5, what is the value of the y-intercept?

Back

-5

Front

What does the slope of a line represent?

Back

The slope represents the rate of change of y with respect to x, indicating how much y changes for a unit change in x.

Front

How do you calculate the slope from two points (x1, y1) and (x2, y2)?

Back

Slope (m) = (y2 - y1) / (x2 - x1).

Front

What is the significance of a negative slope?

Back

A negative slope indicates that as x increases, y decreases, showing an inverse relationship between the two variables.

Front

What does a positive slope indicate?

Back

A positive slope indicates that as x increases, y also increases, showing a direct relationship between the two variables.

Front

What is correlation in statistics?

Back

Correlation measures the strength and direction of a linear relationship between two variables.

Front

What does it mean if there is no association between two variables?

Back

No association means that changes in one variable do not predict changes in the other variable.

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for two variables using dots to represent the data points.