AP Stats: Chapter 2&3
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what is the equation to find a zscore?
z = xmean / standard deviation

how do you find a density curve? Which two questions do you need to ask yourself?
 1.) is it above an xaxis?
 2.) needs an area of one!

What is the empirical rule?
689599.7

what does the distribution have to be so that you can use the empirical rule?
has to be a Normal Distribution.

Splitting it from the middle, and going outwards... what do the percentages need to be for the 689599.7?

what are two variables that you need to analyze a scatter plot?
which one is the x and y?
explanatory and response variable

how do you describe a scatter plot?
S.O.F.A

what's S.O.F.A?
 StrengthÂ
 Outlier
 Form
 Association

what are the three strenghts?
 strong linear relationship
 mediately strong linear
 weak linear

what are the types of form?
curve, linear, cluster

what are the types of associations?
possitive, negative and none

how do you find the strenght by value?
correlation coefficient

what's the purpose of "r"
measure the association & strenght of linear relationship

what happens if r= 0
it's a cluster

can r's resist outliers?
NO!