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Published byLambert McGee Modified over 9 years ago
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Graphs
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V. Data Analysis A. Range 1. Total value your data covers from lowest to highest 2. Range = highest value – lowest value ex. Data is 2 5 7 14 19 Range = 19 – 2 = 17
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B. Average 1. The mean of all the data values collected 2. Avg = total of values # of values added ex: Data is 2 5 7 14 19 Avg = 2 + 5 + 7 + 14 + 19 = 47 = 9.4 5
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VI. Graphs A. Visual way to organize and analyze data B. Types of graphs: 1.Line 2.Bar 3.Pie
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C. Line graph 1. Used when one variable causes a second variable to increase or decrease in value 2. Often show changes over time
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D. Bar graph 1. Compares categories of information 2. Good for surveys
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E. Pie graphs 1. Compares categories of information usually written in percent 2. Slices must add up to 100%
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Practice: Name these graph types
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4.Which type of graph and why? Dog Breed% of dog owners who own this breed of dog Golden Retrievers30% German Shepherd20% Beagle20% Poodle20% Rottweiler10% Pie Graph Percent with total adding up to 100%
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5. Which type of graph and why? Bar graph Comparison survey First Name# of Letters Jasmine7 Alejandra9 Kenji5 Lola4 Jordan6
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F. Variables 2. Dependent variable – variable influenced by independent variable a. Always on y-axis (vertical line) b. No one controls 1.Independent variable – variable that might influence another variable a. scientist changes b. always on x-axis (horizontal line)
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G. Making a line graph 1. Choose variables for your x and y-axis a. x variable causes change in y variable b. Label your axes with titles, numbers, and units 2. Make a scale a. Scale = range # of boxes = # data units per graphbox 3. Plot your data 4. Create a descriptive title putting the y variable first
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Practice A student counted the total number of leaves in a group of duckweed plants over a 5 day period. Copy this data into your notes. DaysNumber of Leaves 015 120 225 340 460 580
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1. What is the independent variable? 2. Which axis does it go on? 3. What is its range? 4. On a 10 x 10 box grid, what is its scale? 5. Number and label your axis. 0 1 2 3 4 5 6 7 8 Days
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6. What is the dependent variable? 7. Which axis does it go on? 8. What is its range? 9. On a 10 x 10 box grid, what is its scale? 10. Number and label your axis. 100 90 80 70 60 50 40 30 20 10 0 Number of Leaves
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11. Now plot your data points and draw a straight line through them. 12. Write a descriptive title for this graph. 13. When would the plants have 35 leaves? 14. How many leaves would the plants have after 7 days?
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H. 3 Types of Graphing Relationships
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1.Direct Relationship a. When one variable increases, the other increases. b. If one variable decreases, so does the other one. c. or draw this as example
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2. Inverse Relationship a. When one variable increases, the other decreases b. draw this as example
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3. No Relationship a. Data points are scattered all over draw this as example
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DirectInverse
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