Unit 1 Flashcards
absolute frequency
number, directly from data
relative frequency
percentage
marginal relative frequency
margin/total
ex. % of all students who took PE
joint relative frequency
join of categories / total
ex. % of all students who chose math and chose art
conditional relative frequency
category / total limited by a condition
ex. % of the students who chose technology given they chose math
association
knowing the value of one variable helps predict the other
- will have different segmented bar graphs
quantitative variable
takes numerical value for measured/counted quality
categorical variable
values are category names / group labels
what can cause graphs to be misleading
- vertical axis not starting at 0
- using irregularly sized images for bar graphs
segmented bar graph
different categorical results shown as relative frequency out of a whole bar
- bars stacked up to make 100%
mosaic plot
Segmented bar graph where width of bars is proportional to group size
discrete data
type of quantitative data which has a countable number of values
continuous data
type of quantitative data that has an infinite number of possible values
when is a graph skewed left/right
higher values on right = skewed left
higher values on left = skewed right
describing distribution
SOCVaC
shape
outliers
center
variability
context
