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AP Stats: Chapter 2&3
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what is the equation to find a z-score?
z = x-mean / standard deviation
how do you find a density curve? Which two questions do you need to ask yourself?
1.) is it above an x-axis?
2.) needs an area of one!
What is the empirical rule?
68-95-99.7
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 68-95-99.7?
34% Â
13.5 %
2.35%
.15%
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!
Author
bananavocado
ID
168203
Card Set
AP Stats: Chapter 2&3
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AP Stats: Chapter 2&3
Updated
2012-09-10T23:39:04Z
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