Graphing in Science. Why do we graph? Visual representation of data “Short hand” for presenting large amounts of information at once Easier to visualize.

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Presentation transcript:

Graphing in Science

Why do we graph? Visual representation of data “Short hand” for presenting large amounts of information at once Easier to visualize trends than by just using numbers or figures More organized way of showing information

Types of Graphs: Data Table Height (cm) of Jr. High Students by Grade 7th8th9th Used to organize data collected Easily make transition from raw numbers into a visual representation

Types of Graphs: Bar Graph Shows data as a side-by- side comparison X axis is usually used to plot independent variable Y axis is usually used to plot dependent variable

Types of Graphs: Line Graph Usually shows a change over time or distance X axis is used to plot independent variable (time, distance, etc.) Y axis plots the dependent variable

Types of Graphs: Pie Chart Shows parts of a whole (percentages) Must have all data available and no groups can share any data Example: Can’t use a circle graph to show athletes by sport at TH Bell

Parts of a Graph

Graph Title Y Axis Label - Include units X Axis Label Legend

Graph Title Y Axis Label Legend X Axis Label

Data Label Graph Title

Graphing Basics

D-TAILS D-TAILS is an acronym used to help you remember everything you need to create a successful graph.

D -TAILS Data covers 50% of the graph area and is accurately placed. YES!!! NO!!!

D- T AILS Title Includes what the graph is about and both the manipulated and responding variables. Hours of Sleep vs. Quiz Scores

D-T A ILS Axis Labels – manipulated variable is always on the x-axis and responding variable is always on the y-axis Hours of Sleep vs. Quiz Scores Sleep Quiz Scores

D-TA I LS Interval Marks Consistent spacing and always start at zero! Hours of Sleep vs. Quiz Scores Sleep Quiz Scores

D-TAI L S Label Units In ( ) after the axis label, include the proper units (if there are units) Hours of Sleep vs. Quiz Scores Sleep (hrs) Quiz Scores (%)

D-TAI L S Scale Always go by an even scale. Ex: 1,2,3,4 NOT 1,2,4,8 Hours of Sleep vs. Quiz Scores Sleep (hrs) Quiz Scores (%)

DRY/MIX Y axis runs vertical ( ↑ ) “DRY” X axis runs horizontal ( → ) “MIX”Y-axis X-axis

After drawing a graph, write a data analysis statement: This graph shows that as mv increases, rv D-TAILS

Always draw a trend line (do NOT connect the dots) to show the mv/rv relationship. Describe the Relationship