Catalyst Jaylan is conducting an experiment to see how the number of ice cubes affects the temperature of his water. When there is 0 ice cubes in his water, the temperature of the water is 72 °F. After he adds one ice cube, the temperature is 69 °F . And when he adds 3, the temperature decreases to 66 °F. 1. What is the independent variable? 2. What is the control group? 3. Create a data table to display his results.

Announcements Tonight for Homework: Comparing Graphs Worksheet

Today’s Objectives SWBAT use bar graphs, pie charts, and line graphs to represent data!

Data Data are information in the form of measurements or observations.

Data Table Data tables are used to display our data. In a data table: The independent variable is on the left The dependent variable is on the right You need to make sure that you include your units!

Studying vs. Assessment Score Independent Dependent Variable Variable An Example Studying vs. Assessment Score Independent Dependent Variable Variable Units!!

Table Data  Line graph

Graphing- Why is it important? Key skill used in math, science, business, social studies, reading Useful for almost all jobs that pay well (medicine, law, business) Big part of every standardized test (especially the ACT) Necessary for class projects

Have you ever heard the saying… “A picture is worth a thousand words!”

Why Use Charts and Graphs? We use charts and graphs to help us communicate our results and conclusions Sometimes, complicated information can be made easier to understand by providing an illustration

There are 4 Main Types of Graphs 1) Bar graphs 2) Line graphs 3) Pie charts 4) Scatterplots

Bar Graph Usually a bar graph is used to compare different groups Useful for comparing data of several groups Example: Popular Degrees to Get in College

Pie Chart or Circle Graph Pie charts are used to show percentages of a whole at a set point in time Show part: whole relationships The “pie” is divided into different “pieces” of different sizes The size of each piece represents a fraction or a percentage of the whole (100%)

Example: Favorite Musicians of 8th Graders

Line Graphs A line graph is usually used to show how something changes over a short period of time They have two different axes that each show a value for a variable Within a line, graph, a point is plotted at each place where the values of two variables intersect A line is used to connect all points Line graphs are best used to show trends in data more clearly than tables

Line Graph vs. Bar Graph

Titling Graphs Must communicate the dependent and independent variables Can be presented in the form “Y versus X” Some graphs need more descriptive titles than others Score vs. Score Final Score vs. Diagnostic Score Relationship between Final Score and Diagnostic Score for 8th Grade Science Brent Maddin * bmaddin@gmail.com

Labeling the X and Y Axes Independent (manipulated) variable is written along the horizontal axis (X axis) Dependent (responding) variable is written along the vertical axis (Y axis) Units on any variables should be included in parentheses (kg) Brent Maddin * bmaddin@gmail.com

Plotting Data Pairs as Points Make sure the data table is in (X,Y) form Select the first pair of values from the data table (X and Y). Draw a light, dashed line up from the number on the X axis and over from the number on Y axis. Where these light lines cross, put a dark point. Repeat for the next pair of points. Ask math teacher when they plot points during the year. Get the language from the math teachers Brent Maddin * bmaddin@gmail.com

Numbering Axes STEP 1: Find the range for the variable Range = Largest Value - Smallest Value STEP 2: Divide the range by the number of intervals you have/want. Round up to get a number that is easy to count by. STEP 3: Mark off intervals on the axis, counting by the rounded number. The interval must be the same amount each time Brent Maddin * bmaddin@gmail.com

So What?? Bar graphs are used to compare groups Pie charts (circle graphs) are used to show part to whole relationship (percentages) Line graphs are used to show trends over time

Student Misconceptions and Common Mistakes when Graphing Brent Maddin * bmaddin@gmail.com

Lets try it! We will practice drawing a graph together!

Independent Practice Begin working on your homework silently and independently What you do not finish, will become homework to be turned in tomorrow