Download presentation
Presentation is loading. Please wait.
Published byGillian Williams Modified over 9 years ago
1
Warm Up September 12, 2013 This is…well…not the greatest graph ever (to put it nicely). How could you improve this graph?
2
Correct HW
3
Quiz #3
4
1.5 Graphs in Science There are many types of graphs. In Life Science last year, you may have used bar graphs or pie charts often.
5
In chemistry and physics, the type of graph that is used most often is the line graph. Charles Law of Gas Behavior in chemistry Distance vs time graph in physics
6
A line graph shows how one variable changes in response to another. Line graphs are used when the manipulated or independent variable is continuous. Continuous Independent Variable
7
A bar graph is used when the manipulated or independent variable is not continuous but has multiple, distinct forms.
8
Parts of a Line Graph X axis Y axis Scale Title X axis label Y axis label Data points Line of best fit Key (if multiple sets of data points are on the same graph) The Effect of Time on Ice Sheet Area
9
Steps in Creating a Line Graph 1. Draw the axes. ;)
10
2.
11
3. Create a Scale Choose a scale that fits your data points. Have consistent intervals. Your data points should fill most of the graph. (if the points are too close together, it is hard to see a trend. Everything looks like a line from far enough out – even the Milky Way Galaxy!) The scale does not have to start at zero.
13
4. Plot the Data
14
5. Add a Title Your title should follow the format: “The Effect of (independent variable) on (dependent variable).” Capitalize all major words in the title. You do not need to capitalize words like “the” and “of”.
15
6. Draw a Line of Best Fit The line of best fit is a line that most closely fits a set of data points.
16
Why draw lines of best fit? A line of best fit can: – Help you see the overall trend – Help you to recognize outliers, or points that may not be accurate – Allow you predict results for data you have not yet collected
17
How to draw a line of best fit: 1.Plot all measured data points on a graph. 1.Make sure independent variable is on x axis. 2.Make sure dependent variable is on y axis. 2.Using a ruler, draw the line that deviates the least from the set of points. 3.Choose two points on the line (they do not have to be data points you measured – just any two points on the line) and use them to calculate the slope.
18
Calculating Slope
19
Example
20
Trends in Graphs Linear Trend: Data points are in a straight line and a line of best fit can be applied. Say or Write: “As (independent variable) increases/decreases, (dependent variable) increases/decreases.”
21
Example “As temperature increases, volume increases.”
22
Nonlinear Trends: Curves For some sets of data, drawing a curve is the best way to represent the data points. Say or Write: “As (independent variable) increases/decreases, (dependent variable) increases/decreases SHARPLY ”
23
Example As pressure increases, volume decreases sharply.
24
“These Old Bones” Graphing Investigation
25
Homework p. 41 #1a-c, #2a-c, & #3a-b Finish “These Old Bones” Lab
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.