Ch. 4 Test Review

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they have the same slope and will never intersect.

Front

What is the slope of a line perpendicular to a line with slope -5?

Back

The slope of a line perpendicular to a line with slope -5 is 1/5.

Front

What is the correlation coefficient?

Back

The correlation coefficient is a statistical measure that describes the strength and direction of a relationship between two variables.

Front

What does a correlation coefficient of -0.19 indicate?

Back

A correlation coefficient of -0.19 indicates a weak negative correlation.

Front

How do you find the equation of a line given a slope and a point?

Back

Use the point-slope form: y - y1 = m(x - x1), where m is the slope and (x1, y1) is the point.

Front

What is the equation of a line with slope 7 that passes through (0,1)?

Back

The equation is y = 7x + 1.

Front

What does a positive correlation mean?

Back

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

Front

What does a negative correlation mean?

Back

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

Front

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

Back

No correlation means that there is no predictable relationship between the two variables.

Front

What is the slope of a line?

Back

The slope of a line is a measure of its steepness, calculated as the rise over run (change in y over change in x).