This document provides instruction on different types of graphs (bar graphs, line graphs, scatter plots) and how to analyze correlations in data represented in graphs. It discusses key features of graphs like titles, labeled axes starting at zero, and using 75% of the axes. Students are prompted to identify independent and dependent variables, observe characteristics of sample scatter plots, and evaluate if a sample graph includes all necessary components. The goal is for students to understand how to choose the best graph type to represent their data and interpret correlations.

1. Today’s Objective:
SWBAT to create graphs and choose the best
type of graph to represent data
Data: Results from an experiment
August 29, 2013

2. Which of these is easiest to read?
The graph? Or the data?
In 1995, 113 boys and 87 girls
had internet at home. The next
year, 1996, the numbers
increased dramatically, where
179 boys and 161 girls used the
internet. In 1997 it continued to
increase with 242 boys and 224
girls using the internet. After
1998 it continued to slowly
increase and by 2002 317 boys
and 325 girls used the internet.

3. Bar Graphs
• A visual display used to compare the amounts
or number of times something happens
*Draw a quick sketch of a bar graph under “bar
graph” on the left side of your Cornell notes
• Ex: different types of birds in an environment

4. What is this bar graph showing us?

5. Line Graphs
• A visual display used to show how something
changes over time by connecting points on a
graph.
• *Draw a quick sketch of a Line graph on the left
side of your Cornell notes
• Ex: How weight changes over time

6. What does this line graph represent?

7. Scatter Plots (a type of line graph)
• Scatter plots usually consist of large bodies of
data and show how much one variable is affected
by another.
• The relationship between two variables is called
their correlation.

8. What does this scatter plot represent?

9. Correlation! Correspondence, interaction, relationship
• The closer the data points come when plotted to
making a straight line, the higher the correlation
between the two variables, or the stronger the
relationship.
• Positive Correlation: When graphed, you get an
upward slope -- that is up from left to right.
• Negative Correlation: When graphed, you get a
downward slope- that is down from left to right

10. Write 2 observations about each of
these scatter plot graphs.
•

11. Based on your prior knowledge make an
inference as to what type of correlation
you see on the graphs below.

12. When making a graph from your data,
all graphs:
• Must have a title
• Must have x (horizontal) and y (vertical) axes
that are labeled
• Must start at zero
• Have an equal distance between each number
and use 75% of the axes.
• Must have a key if using more than one data set

13. Does this graph have all parts that it
needs?

14. Graphing your variables

15. What is the Independent variable
represented on this graph? Dependent?