2. Understanding PIE CHARTS
• Pie charts are perhaps the most ubiquitous
chart type; they can be found in
newspapers, business reports, and many
other places. But few people actually
understand the function of the pie chart
and how to use it properly. In addition to
issues stemming from using too many
categories, the biggest problem is getting
the basic premise: that the pie slices sum
up to a meaningful whole.
3. How to Read Pie Charts?
• There are two features that let us read the
values on a pie chart:
-the angle a slice covers (compared to the
full circle)
-the area of a slice (compared to the
entire disk).
4. How to Read Pie Charts?
• Research suggests that we look at the angle in
the center, essentially reducing the chart to
just the crossing lines there. We are not very
good at measuring angles, but we recognize
90 and 180 degree angles with very high
precision. Slices that cover half or a quarter of
the circle will therefore stand out. Others can
be compared with some success, but reading
actual numbers from a pie chart is next to
impossible.
5. When to Use Pie Charts?
“There are some simple criteria that you can use to
determine whether a pie chart is the right choice for
your data.”
• Do the parts make up a meaningful whole?
If not, use a different chart. Only use a pie chart if you can define the
entire set in a way that makes sense to the viewer.
• Are the parts mutually exclusive?
If there is overlap between the parts, use a different chart.
6. • Do you want to compare the parts to each other or the
parts to the whole?
If the main purpose is to compare between the parts, use a different
chart. The main purpose of the pie chart is to show part-whole
relationships.
• How many parts do you have?
If there are more than five to seven, use a different chart. Pie charts with
lots of slices (or slices of very different size) are hard to read.
• In all other cases, do not use a pie chart. The pie chart is the wrong chart
type to use as a default; the bar chart is a much better choice for that.
Using a pie chart requires a lot more thought, care, and awareness of its
limitations than most other charts.
When to Use Pie Charts?
7.
8. BEFORE TAKING THE TEST
TAKENOTE THAT THERE ARE 300
ROSES ALL TOGETHER.
GOODLUCK
11. 1. (It depends)
2.How many percent of roses are
ORANGE?
ans. 100%-40%-25%-12%-
10%=13%
Therefore there are 13% of ORANGE roses.
ANSWERS
12. 3. What is the ratio of the number of WHITE roses to the number of
REDroses?
10% OF ROSES ARE WHITE.
10/100 X 300 = 30
There are 30 WHITE roses.
40% of roses are RED.
40/100 x 300 = 120
There are 120 RED roses.
Ratio 30:120 = 1:4
ANSWERS
13. Prepared by:
• Joanah Grace M. Atenta
• Mary Grace P. Docto
• Aubrey Ann P. Edang
• Girlene L. Estrope
• Rachel Ane M. Palma
