Interpretation of Diagrams Flashcards
1
Q
For box plot comparisons, what should you mention?
A
- Median value (e.g A on average scored higher than B)
- Overall distribution (wide spread/narrow spread)
- Any outliers
2
Q
When are cumulative frequency graphs used?
A
To estimate the median, IQR or percentiles for grouped data
3
Q
How is frequency density calculated?
A
Frequency / Class Width
or simply
frequency per unit of the group
4
Q
When are histograms used?
A
To show data distribution for grouped continuous data
5
Q
How are histograms converted to frequency polygons?
A
Join the middle of the top of each bar as a smooth line
