Tool of Science

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Tool of Science
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WHAT is a
Data table?

• A chart that lets you organize information in
  rows and columns.

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labeled
Data tables should be
Descriptive title
Table number
Why is Labeling a data table important?
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WHAT is a
Graph?

• A picture of the data.

types of graphs...
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Pie Graphs parts of a whole
When you want to show what portion or fraction of
a group falls into certain categories, you use a
pie graph.
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Bar Graphs to compare
Bar graphs are best for showing comparisons
between groups or categories.
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Line Graphs change over time
When there is change occuring over a particular
period of time, a line graph will be used
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labeled
Graphs should be
Descriptive title
Graph number
Graph 1
Both axis titles and data
Why are units of measure are important in both
graphs and data tables?
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What type of graph?
What kinds of pizza people in this class like?
PIE
How much it rained each month this year?
LINE
Which is the largest class at AHS?
BAR
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Birthdays?
Would we use a line graph to show when our
birthdays are?

• Our birthday does deal with time (months/years)
• But, our birthday is constant - it never
  changes.
• A line graph shows change in time, so we would
  not use it for this type of graph.

What kind of graph would we use?
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How do we make a graph?

• Bar line graphs have two
• different axiss
• An axis is either the horizontal line (called x)
  or the vertical line (called y) that form the
  base lines of a graph.

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What data goes on the Y axis?
What data goes on the X axis?
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X-axis and Y-axis

• x-axis is always horizontal
• y-axis is always vertical.
• The x and y-axis usually starts with zero
• Intervals on the y-axis are always equal.

What is an interval?
Why should they be equal?
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Is this an acceptable graph?
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What is the independent variable?
What is the dependent variable?
How many miles were traveled on Thursday?
Were more miles traveled on Monday or Friday?
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How much corn did the U.S. have in 1991? What
does the y-axis represent in the graph? Can you
think of another title for this graph? What is
the dependent variable? What did it depend on?
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The Special case of a PIE chart
No axiss How do you know what each section
represents?
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Show the percentage of the various animals in the
MM lab.
Type of graph?
Which table had the most giraffe (yellow MMs).
Type of graph?
Changes in the population size of the lions from
2000 to 2010?
Type of graph?
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Great Job!