AP Stats unit 1

ABBREVIATIONS:

var: variable

cat: categorical

quan: quantitative

dist: distribution

marg: marginal

con: conditional distribution

gr: graph

bgr: bar graph

pgr: pie graph

TERMS

individuals: objects described by data

sample: percentage of a population used to survey

population: population being surveyed

variables: characteristics observed in individuals for a statistical purpose

cat var: places an individual in a group based on a var, eg. color of car

qual var:based on a number SPECIFICALLY to find a statistical average

distribution: the values the data takes and how often it takes them ; this includes the shape, center, and spread of the data set

two way dataset: represents two var of an individual

marginal distribution: the ratio of a var among all var, ex. ratio of red cars to all cars in dataset

conditional distribution: the dist of a var among individuals meeting a certain condition, ex. what portion of left handed people drive red cars

Data Representation:

Graphs should always start at 0. Pictorial graphs lead to misrepresentation of data. Only catvars can be represented by pgrs or bgrs. When representing margdist, percentages are better.

BGRs:

Must start at 0

Must be neat and equal in width

numbers must be evenly spaced

must be clearly labeled

Interpreting Data:

margdist:

find the percentage of the variable in comparison to the sample

part/whole=margdist%

10/100=10%

note: make sure I can find IQR/GATES