bellringer homework check place your homework on your desk- “choosing an appropriate graph” take...
DESCRIPTION
& Units of MeasurementTRANSCRIPT
BellRingerHomework Check
• Place your homework on your desk- “Choosing an Appropriate Graph”
• Take out two sheets of notebook paper for notes.
• Take out one sheet of graph paper.• You need a pencil today!
Constructing and Analyzing Bar Graphs
& Units of Measurement
Guidelines for Making a Bar Graph
• Bar Graphs are perfect for showing information that shows quantities or numbers, or the frequency of things
• Bar Graphs may also be used to show changes over time or to compare items with one another.
Review
Guidelines for Making a Bar Graph
Step 1: Identify the variables.
Independent variable – factor the is changed on purpose by the experimenter
Dependent Variable- factor that changes because of the independent variable
and is measured
Guidelines for Making a Bar Graph
Step 2: Determine the variable range.
Subtract the lowest value from the highest value for the dependent variable.
Guidelines for Making a Bar Graph
Step 3: Determine the scale of the graph.Determine the numerical value for each grid unit
(square) on your graph paper that best fits the range (from step 2) of each variable.
Formula: (y-axis) Grid unit = Data range / #of lines on your graph paper
Determine the number and width of bars on graph (x- axis)
Evenly space all bars.
Guidelines for Making a Bar Graph
Step 5: Number and label the y-axis & label the x-axisNumber the y-axis according to the scale from step 4.
Label the y-axis including units of measurement when necessary.
Label the x-axis and each bar on the x-axis including units of measurement when necessary.
Guidelines for Making a Bar Graph
Step 6: Determine the data points and create the bar graph.
Remember to evenly space all bars.
Guidelines for Making a Bar Graph
Step 7: Provide a number and descriptive title for the bar graph.
Title fomat: Figure #: The effect of ___IV____ on___DV____.
Let’s Make a Bar GraphCopy the data table below onto aseparate sheet of paper.
Detergent Brand
Size of Bubbles (cm) Average Size of
Bubbles (cm)
Trial 1 Trial 2 Trial 3 Trial 4
A 44.0 38.9 30.8 29.4 35.8B 25.6 30.2 23.3 20.1 24.8C 10.0 15.4 21.6 12.9 15.0
• Examine each graph carefully.
• What was tested, changed, or compared
(INDEPENDENT VARIABLE) is plotted on
the X-axis.
• The data that was observed & measured (DEPENDENT VARIABLE) is plotted on the
Y-axis.
• The title and the label on the X-axis tells us that the type of fertilizer was tested in this experiment (Independent variable).
• The Y-axis tells us that plant height was measured in centimeters in this experiment (Dependent variable).
What is What is This This
Graph Graph About?About?
• Since there is a difference in the heights of the plants that received different fertilizers, we can say that there seems to be a relationship between plant height and type of fertilizer.
• The independent variable (type of fertilizer) affected the dependent variable (plant height).
• Super Gro seems to be the best fertilizer for plant growth.
AnalysisAnalysisAnd And
ConclusionConclusion
• The title and the label on the X-axis tells us that the types of degrees earned at colleges and universities between 1999 and 2000 were compared.
• The Y-axis tells us the number of people earning these degrees was measured.
• There is a significant difference between the number of people graduating with business degrees and the number of people graduating with other types of degrees.
• We can say that the type of degree or discipline division (independent variable) affects the number of people that get a certain degree (dependent variable).