LESSON 1.6Broken-Line Graphs

DEFINITIONS In your math notebook, define the

following words: Line graph - a graph whose points are

connected by a line or line segments to represent data – usually has one line or line segment

Broken-line graph- a graph whose points are connected by a line or line segments to represent data – includes two or more line segments

Precipitation - a deposit on the earth of hail, mist, rain, sleet, or snow

Graph key - used to identify the number of categories present in a graph

MATH MESSAGE Turn to page 140 in your student

reference book Use the graph in the example to answer

the following questions:What do the horizontal and vertical axes

show?What can you conclude from the graph?

DRAWING AND INTERPRETING Science Link

Broken-line graphs are often used to show trends and the results of scientific studies.

As a class, we will complete math journal page 18

MATH JOURNAL PAGE 18 The average number of days with a

trace of precipitation (at least 0.01 inch) is shown for each month with a dot

Line segments are then used to connect consecutive dots

PAGE 18 What month has the greatest number of days

with precipitation? How can you tell?

Which season has more days with precipitation—winter or summer?

Which month has the least number of days with precipitation? How can you tell?

Can you tell from the graph which month has the greatest amount of precipitation?

Is there a period in which little change occurred? How would you describe the pattern or trend

shown by the graph?

READING AND INTERPRETING

Double-line graphs are often used to show comparative changes over time

The graph of page 19 consists of two broken-line graphs on the same set of axes making it a double-line graph

Look at the graph keyWhy is that so important?

What data sets could be displayed using double-line graphs?

WITH A PARTNER Complete journal page 19, problems #2-

#4

HOMEWORK Study Link 1.6 Math Boxes 1.6

ACTIVITY Research your favorite sports team Find the number of wins they had in the

last ten seasons. Create a broken line graph and a bar

graph to represent those wins. Make sure you include:

Labels and values on your vertical and horizontal axis

Title for each graph

ACTIVITY When you finish, let me know. You will switch your graph with another

classmate. With your partner’s graphs, on a

separate piece of paper calculate:MeanMedianMode (if there is one)Range