Learn: Sofa- Ap stats

Goes on x and y axis

(response) dependent, Independent explanatory

what sofa is short for

strength, outliers, form, association

strength

strong, moderate, weak

outliers

describe what you see

form

linear or curved

association

slope (+or-)

when there is association

there is a moderate strong between number of knots & lenghts of wire

Sign of correlation

gives the direction of the association

what is correlation between

always between -1 and +1, can be exactly -1.0 +1.0

Correlation treats x and y symmetrically

the correlation of x with y is the same as the correlation of y with x

Correlation has no units

correlation is sometimes given as a %, but you shouldn't do that because correlation has no "something" of which it can be a %

what is correlation not affected by?

is not affected by changes in the center or scale of either variables

What does correlation measure?

measures the strength of the linear association between the two variables

what is correlation sensitive to?

sensitive to outliers. a single outlying value can make a small correlation large or make a large one small

what is correlation coefficient?

a number that measures the strength and signs

strong correlation

-1 and 1.8

mod correlation

-5

weak correlation

0 .3

moderate positive correlation

.5 and .7

strong positive correlation

.8, .9 and +1