2 Processing & Representing Data Flashcards
database
a collection of information
what to write in a table if there is missing data
write not available
what are two way tables for
representing bicarbonate data
rules of bar chart
bars equal width, equal spaces between
height of bar represents frequency
vertical line graph
multiple bar chart
composite bar chart
each bar shows how the total frequency is made of different component groups
in comparative pie chart ____ is proportional to ______
area of sector, frequencies
individual angles, proportions
formula for comparative pie charts
population pyramid
same shape as a back to back stem and leaf diagram but can be used for continuous data so more like a back to back histogram
- used to easily compare by gender and age of population
histograms & frequency density
height = fd (y axis)
area = frequency
width = class width
frequency polygon
cumulative frequency table
cumulative frequency step polygon
for discrete data
cumulative frequency
running total of frequencies
cumulative frequency diagram
for continuous data
can be used to estimate/predict values
positive skew
negative skew
choropleth map
thematic map
used by geographers
light to dark shading shows density of variable
always have a key to shoe what each shade represents
eg: population density, land use, income from tourism, food produced
pro and con of choropleth map
show pattern
but maybe difficult to read for people with vulisual impairment
how can graphs be misleading
how to compare 2 distributions
describe shape
compare where highest fd is
(and highest and lowest values maybe)
why are 3D diagrams misleading?
parts at front look bigger than parts at back
sections separated from others make comparisons difficult
darker colours stand out more
tables vs barC & lineG vs pieC
how to describe shape
(weak/strong) positive skew/negative skew/symmetical
