1. Graphing and Analyzing Scientific Data
Write the following heading in your notebook and answer the bell work question.
“Graphing and Analyzing Scientific Data”
8/26/2015
Homework: Graphing and Analyzing Scientific Data Worksheet (if not finished during class)
BW: Sketch an example of a line graph, bar graph, and pie graph.

2. Objectives
I will learn about different ways to graphically represent data. I will also learn how to analyze these graphs for scientific data.
I will show that I can graphically represent data by constructing my own graphs and using these graphs to analyze a set of given data.

3. Types of Graphs Pie/Circle Graphs Bar Graphs Line Graphs
Used to show parts of a whole.
Bar Graphs
Used to compare
amounts
Line Graphs
Used to show the change of one piece of information as it relates to another change.

4. Parts of a Graph Title Independent Variable Dependent Variable Scales
Summarizes information bing represented in ANY graph.
Independent Variable
Variable controlled by the experimenter. Placed on X axis.
Dependent Variable
Variable directly affected by independent variable. Placed on Y axis.
Scales
Tells you where to plot data points.
Legend
Describes the graph’s data.

5. Variables
any item, factor, or condition that can be controlled or changed
looking for a cause and effect relationship

6. So then… x is the … y is the… m and b are… Together they show a…
Independent variable
Dependent variable
Constants
Relationship

7. y=mx+b Are there any restrictions on what x can be?
What determines the value of y?
What happens when I plug x into that equation?
Do m and b change?
What is the result if I plug several values for x into that equation?

8. Mean, Median, Mode Mean Median Mode
Determined by adding all the numbers in a data set together and then dividing by the number of values.
EX: = 12/3 = 4
Median
Middle number in a set of data. If there is an even set of numbers in the data, then take the average of the two middle numbers.
EX: 2, 3, 4, 8, 12, 16, 20 median = 8
EX: 3, 5, 8, 11, 17, 19, 27, 30 median is = 28/2
Mode
The number that occurs most often in a data set.
EX: 3, 4, 6, 6, 7, 9, 9, 9, 12, 12, 15 mode = 9

9. Extrapolate & Interpolate

10. What would you expect pay for 30 Kg?
Interpreting data
Extrapolate: extending the graph, along the same slope, above or below measured data.
What would you expect pay for 30 Kg?

11. Interpreting data
Interpolate: predicting data between two measured points on the graph

12. Best fit line