Making Data Visible

Question 1

What is Categorical data?

Answer 1

Data: Categories
• Nominal (without order)
• Ordinal (with order) Classical representation:
• pie chart or bar graph

Question 2

What is quantitative data?

Answer 2

Data: Scores
• Interval: differences between scores are meaningful
• (Ratio: there is an absolute zero point)
Classical representation:
• Stem leaf plot, histogram, boxplot

Question 3

Stem-leaf plot - why? when to use?

Answer 3

Benefits:
• Easy visualization of distributions
• Shows each recorded value
When to use:
• Low number of recording

Question 4

Other graphs etc

Answer 4

• Histogram

- Boxplot