Download Lesson 22, Analyzing and Comparing Statistical Graphs

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Warm Up
• 1. The set of real numbers includes all ______________________ numbers and
__________________ numbers.
Name the point that corresponds to each value.
2. −1.5
3. 1.75
4.
2
3
5. Find the difference between 12.3 million and 20,000.
Lesson 22, Analyzing and
Comparing Statistical Graphs
Probability and STatistics
Vocabulary
 Bar graphs: use vertical or horizontal bars to represent data
 Double bar graph: shows groups of two bars side by side in order to compare
sets of data
 Stem and leaf plot: data display that displays some digits as stems and some as
leaves; useful for organizing and ordering data
 Line graph: a line drawn through points on a grid to show trends and changes
over time
 Double line graph: compares two related data sets using a line graph
 Circle graph: (aka pie chart) uses sections of a circle to compare parts to a
whole; each “slice” represents a specific percent/fraction of the whole
Example
Sal and Harry both own sandwich
shops. The double bar graph
shows the number of shops they
owned at the end of each year.
What conclusions can be made
from the graph?
Sandwich Shops
20
18
16
14
12
10
8
6
4
2
0
2001
2002
2003
Sal's Deli
2004
Harry's Deli
2005
2006
Example
• The stem and leaf plot shows the
scores of students on a math test.
a. What was the lowest score?
Scores on Math Test 2
Stem
b. What was the highest score?
c. What score appeared most?
d. What is the median score?
e. How many students took the test?
6
7
8
9
10
Leaf
668
136677
14446778
1889
0
Example
• The double line graph shows the same
data as the double bar graph from the
first example.
• What conclusions can you make from
the graph?
Chart Title
18
16
14
12
10
10
9
8
7
5
2
2001
2002
2003
Sal's Deli
2004
Harry's Deli
2005
2006
Example
• The table shows Andre’s bank account transactions. Make a graph to
compare the deposits and withdrawals.
Month
January
February
March
April
May
June
Deposits
$475
$200
$350
$425
$500
$150
Withdrawals
$100
$275
$350
$400
$200
$225
Example
• The circle graph shows Art
Online’s total yearly sales by
quarter. The total amount of
sales for the year was $20
million. Find the sales each
quarter.
ART ONLINE YEARLY SALES
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
12%
43%
32%
13%