Review Chapter 4

Front

What type of correlation does a scatter plot show when the values increase together?

Back

Positive linear association

Front

What type of correlation does a scatter plot show when one value increases while the other decreases?

Back

Negative linear association

Front

What is the slope-intercept form of a linear equation?

Back

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

Front

How do you find the slope of a line given two points (x1, y1) and (x2, y2)?

Back

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

Front

What does a slope of 0 indicate about a line?

Back

The line is horizontal and there is no change in y as x changes.

Front

What does a slope of undefined indicate about a line?

Back

The line is vertical and there is no change in x as y changes.

Front

If a line has a slope of 4/7, what is the slope of a line that is perpendicular to it?

Back

-7/4

Front

What is the relationship shown by a scatter plot where the points form a downward trend?

Back

As one variable increases, the other variable decreases.

Front

What is the y-intercept in the equation y = 4x + 13?

Back

13

Front

How do you determine if there is no correlation in a scatter plot?

Back

The points are scattered randomly with no discernible pattern.