Data Presentation Flashcards
(33 cards)
What are pie charts used to present?
Discrete data (percentages/proportion).
Why are pie charts effective?
Easy to understand and interpret.
Easy to draw.
Why are pie charts ineffective?
Calculating the size of each section can be more difficult than a bar chart.
Lots of sectors can make it difficult to analyse.
What do scatter graphs show?
Comparison/correlation of 2 sets of data (usually continuous) - eg: wind speed and distance.
Why are scatter graphs effective?
Easy to construct.
Shows the correlation between data clearly.
Why are scatter graphs ineffective?
Needs a large data set.
Almost impossible to label data points.
What do bar graphs show?
Absolute values.
Each bar = a category.
Discrete data (such as frequency).
Why are bar graphs effective?
Easy to construct.
Easy to understand.
Why are bar graphs ineffective?
Can be too simplistic.
Only for discrete data.
What do line graphs show?
Continuous data.
What are line graphs effective?
Easy to construct and understand.
Anomalies are easily identifiable.
Why are line graphs ineffective?
Time consuming to construct.
Often require addition info to be useful.
What do proportional circles/symbols show?
Located data.
Quantitative data.
Why are proportional circles/symbols effective?
Good visual representation of data.
Sophisticated.
Why are proportional circles/symbols ineffective?
Needs a correct scale otherwise may be difficult to read.
Must have a scale or it’s useless.
Circles may overlap.
What do chloropleth maps show?
Values for different locations/areas.
Grouped continuous data.
Why are chloropleth maps effective?
Visually effective.
Easy to see patterns of variable change across a space.
Why are chloropleth maps ineffective?
Time consuming to construct.
Doesn’t show variations with one location.
Why is random sampling effective?
Least biased sampling technique.
What is random sampling?
People/sites selected at random.
Used with large sample populations.
What is systematic sampling?
Data is collected in an ordered way (eg: every 5 metres).
Why is random sampling ineffective?
Can lead to poor representation of the overall population.
Time availability and access may change sample (eg: if a key site is closed = less tourists).
Why is systematic sampling ineffective?
May exclude key sites.
Why is systematic sampling effective?
It is straight forward.
Collects a good coverage of an area.
