Transcript Choosing appopriate graphs ppt

Data Analysis
Choosing the
Appropriate Graph
Essential Question
• Can you pick the correct graph to
use when given certain
information?
Choosing Appropriate Graphs
• Pictograph – Visual display of data
“Eye Catching”
***Key Features: Must use a symbol
to represent data items
Choosing Appropriate Graphs…
• Bar Graph - categorical data
“categories” and comparing
Type
of Fish
Swimming
Speed
Carp
6
Cod
8
Mackerel
11
Pike
6
A Legend tells
you what each
bar represent.
Choosing Appropriate Graphs…
• Line Graph – change over a period of time
Choosing Appropriate Graphs…
• Histogram – a special type of bar graph
that displays intervals or ranges
Key Features: Ranges and Bars connect
Choosing Appropriate Graphs…
Box plot – shows measures of variation
of data and quartiles.
The box tells you that about half of the people own 2 to 4 pairs of
sunglasses
Choosing Appropriate Graphs…
Circle Graph – displays percents or fractional parts
Choosing Appropriate Graphs…
• Stem-and-leaf Plot – lists numerical data
in order from least to greatest
ex) Ordered Plot
•Line Plot – shows data above
number line displayed with
“X’s” (outliers and mode easily
identified)
What type of graph?
1.
A car dealership sells seven makes of cars. Which data
display(s) could be used to compare sales for each make of car
last year?
2.
3.
4.
The ages of 16 school teachers are:
48, 52, 46, 58, 25, 48, 55, 51, 58, 49, 60, 53, 30, 27, 42, 49
Postage Stamp Rate
Year
U.S. Letter Rate
(cents per oz.)
1992
1994
1996
1998
2000
2002
2004
29
29
32
32
34
37
40
5. Would you use a bar graph or a stem-and-leaf
plot to display the ages of 30 people buying a
movie ticket? Explain.
6.
Select an appropriate display to compare the
percent of ethanol production by state. Justify
your reasoning.
Ethanol Production by State per year
State
Iowa
Nebraska
Illinois
Minnesota Indiana
Other
Gallons
(millions)
3534
1665
1135
1102
5098
1074
7. Recreation football sign-ups are complete. The following number
of boys registered in each age group are listed below:
7 to 8 year olds - 48 boys
9 to 10 year olds – 73 boys
11 to 12 year olds – 68 boys
What type of graph would you use to display this information?
EXAMPLE 1
Choosing an Effective Display
Stamps
Which graph is more effective in comparing the percent of people who
prefer sports stamps to the total number of people?
EXAMPLE 3
Choosing an Appropriate Display
Weather
The data displays organize the daily high temperatures during a recent month
in Boston, Massachusetts. Which display can you use to find the median high
temperature?
3
6
4
0 1 4 5 7 8 99 9
5
3 3 3 4 6 6 6 88
6
0 0 2 3 5 5 7
7
2 3
8
4 5
Key: 3
6 = 36 ºF
GUIDED PRACTICE
1.
for Examples 1, 2, and 3
What If?
Suppose you want to compare people preferring art stamps to people
preferring animal stamps. Which graph is more effective? Explain.
Appropriate Data Displays
Transportation
450
400
350
300
250
200
150
100
50
0
Number of People
Number of People
Transportation
Series1
Airplane
Bus
Car
Train
450
400
350
300
250
200
150
100
50
0
Series1
Airplane
Bus
Car
Train
Transportation
Which graph would be most appropriate to
show the method of travel used by most
people?
Airplane
Bus
Car
Which graph compares the number of people
who ride the bus to the entire population?
Train
BrainPop: Graphs
Appropriate Data Displays
Average Temperature
Average Temperature
2006
2004
Series1
2002
2000
76
74
72
Series1
70
68
70
75
80
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
66
65
Tempe
rature
Year
Temperature
78
Year
Which graph would be best to show the change in average
temperatures?