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Data Presentation (Grade 7)
235
Unit: Data Analysis and Statistic (DAS)
Bar Charts and Line Graphs
Objectives
Objectives
- Read and interpret bar-charts
- Read and interpret line graphs
I know...
Line
Graphs
Line Graph: A graph with points connected by lines to show how something changes in value:
• as time goes by,
• or as something else changes.
The point at which the axes intersects is always (0,0).
Data points are plotted and connected by a line in a "dot-to-dot" fashion.
Tuesday
Example:
78 degrees
Monday
(1) On which day was the temperature 70˚F
(2) What was the temperature on Friday?
(3) On what day was 12 pm hottest?
(4) Between which two days was there the greatest increase in temperature?
(5) What was the increase in temperature from Thursday to Friday?
Explore
Sun to Mon
3 degrees
175
You Try...
Monday
Saturday
(1) _______ people attended the play on Sunday.
(2) The school made the most money on _____________
(3) The least amount of people attended on which day? _______________________
(4) What is the combined attendance for the three day weekend? ____________
(5) Between which two days was there the greatest decrease? ________________
Your Turn!!
500
Fri to Sat.
I know...
Bar
Charts
A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights.
The horizontal (x) axis represents the categories.
The vertical (y) axis represents a value for those categories.
A bar graph is useful for looking at a set of data and making comparisons.
Example:
The below table shows a survey of favorite movies:
Explore
How can I represent this table using a bar chart?
Steps in drawing
a bar chart..
Process
1. Decide on a title for your graph
2. Draw the vertical and horizontal axes
3. Label the horizontal axes (Movie types)
4. Label the vertical axes (Number of persons)
5. Decide on a scale (Consider the least and greatest number shown)
6. Draw a bar chart to represent the total for each item.
Demonstrate
(1) Which movie is the most liked (modal)?
(2) Which movie was the least liked?
Romance
Drama
Movie Type
Your Turn...
Using the Bar chart, answer the following questions on the right.
(1) Which month is the modal month students made birthday?
June
Demonstrate
(2) Find the average number of students celebrating birthday each month.
62/12=5.17
We know....
Recap
Line Graph: A graph with points connected by lines to show how something changes in value over time.
A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights.