September 11, 2012

A relationship refers to the correspondence between two variables.

two ways to view the relationship: the nature of the relationship or the pattern of it.

Some pairs of variables are related positively. This means that as one variable goes up, the other tends to go up as well.

For example, height and weight are positively related because taller people tend to be heavier.

Also known as an inverse relationship negatively related, which means that as one

goes down the other tends to go up. y, decreases as another, say x, increases. For example, gas mileage and the weight of

a car are negatively related, because heavier cars tend to get lower mileage.

no pattern scattered This means the two

are not related.

Size shoe a baseball player wears and their batting average

Not related because the shoe size does not make the player better or worse, then are not related.

Two variables may be related linearly. This means that a straight line can represent their relationship.

For example, the amount of paint needed to paint a wall is linearly related to the area of the wall.

nonlinear:relationships cannot be represented by a straight line.