Bar Graphs, Line Plots, Frequency Tables, and Histograms

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```							Bar Graphs, Line Plots, Frequency Tables, and Histograms                                                                                                          Lessons 6-4, 6-5

Why? Data is easier to interpret when it is organized into a table or a graph.

Average Summer Temperatures                                                             Number of Goals Made
40

Temperature (C)
35                                                                4 6 2 4 3 2 0 5 3 3 0 2 3 4
30
A bar graph is used to                                           25
20
display countable data                                           15                                     A line plot uses a
10                                                                                                            x
that are grouped in                                               5                                     number line and X’s                                                  x x x
0                                     or other symbols to                            x                     x x x
categories.                                                                                                                                            x                     x x x x x
for ous

t

for ous
d
res

lan
est

est
show frequencies of
u

r
n fo

ss

nife
cid

Gra
values.                                        0        1            2     3    4    5    6
Rai
De

Co
Biomes

Item         Tally     Frequency                                                                                                                                           Last Weekend
5
Item 1            |||                          33                                                     A histogram is a bar graph

(Frequency)
4

Item 2            ||||                         47                                                     that shows the frequency of                                      3
2
occurrences within each                                          1
Item 3             ||                          29                                                     interval.                                                        0
1–10 11–20 21–30 31–40
Item 4            ||||                             5                                                                                                                             Number of pages
A frequency table tells the number of times
something occurs.

Ordered Pairs, Line Graphs, and Stem-and-Leaf Plots Lessons 6-6 through 6-10
Why? Choosing an appropriate data display depends on the data and the purpose.

Ordered Pairs                                                                                    A stem-and-leaf plot               Stems                   Leaves
5                              arranges data by place                             1       1     2   3
4
Each point on a coordinate                                                                              value.                                             2       2     2   3 6 7
3              (3, 2)
grid can be located by                                                                                                                                     3       1     1   3 3 8 9
2
using an ordered pair of                                                                                                                                   4       7     8
1
5       4     6   9
numbers, such as (3, 2).                                                 0      1 2 3 4 5
• The starting point is (0, 0).                                                                                                             Key: 3 8 means 38
• The ﬁrst number tells how
to move horizontally.
• The second number tells
how to move vertically.
Line graphs that display                                             Stock Prices
two sets of data are                           \$95
Price of stock

A line graph
Stock Prices                      called double-line                             \$90
displays a set of
\$40                                                                                                        \$85
Price of stock

data using line                                                                                         graphs. Double-line                                                                 Corp. A
\$30                                                                                                        \$80
segments. Data that                                                                                     graphs are often used                            0
Corp. B
\$20
shows change over                           \$10                                                         to compare the two                               1985                    1990     1995   2000
time is best                                 \$0                                                         data sets.                                                                 Year
1985                    1990      1995           2000
displayed in a line
Year
graph.

308B

```
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