BellRinger Homework 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-axis Number 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 Graph Copy the data table below onto a separate sheet of paper. Detergent Brand Size of Bubbles (cm)Average Size of Bubbles (cm) Trial 1Trial 2Trial 3Trial 4 A B C

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 This Graph 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. AnalysisAndConclusion

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).