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# Intro to Graphing Data Powerpoint-7th and 8th Grade

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Science
Graphing Data
Line Graph
Bar Graph
Scatter Plots
Independent and Dependent Variables

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### Intro to Graphing Data Powerpoint-7th and 8th Grade

1. 1. Today’s Objective: SWBAT to create graphs and choose the best type of graph to represent data Data: Results from an experiment August 29, 2013
2. 2. Which of these is easiest to read? The graph? Or the data? In 1995, 113 boys and 87 girls had internet at home. The next year, 1996, the numbers increased dramatically, where 179 boys and 161 girls used the internet. In 1997 it continued to increase with 242 boys and 224 girls using the internet. After 1998 it continued to slowly increase and by 2002 317 boys and 325 girls used the internet.
3. 3. Bar Graphs • A visual display used to compare the amounts or number of times something happens *Draw a quick sketch of a bar graph under “bar graph” on the left side of your Cornell notes • Ex: different types of birds in an environment
4. 4. What is this bar graph showing us?
5. 5. Line Graphs • A visual display used to show how something changes over time by connecting points on a graph. • *Draw a quick sketch of a Line graph on the left side of your Cornell notes • Ex: How weight changes over time
6. 6. What does this line graph represent?
7. 7. Scatter Plots (a type of line graph) • Scatter plots usually consist of large bodies of data and show how much one variable is affected by another. • The relationship between two variables is called their correlation.
8. 8. What does this scatter plot represent?
9. 9. Correlation! Correspondence, interaction, relationship • The closer the data points come when plotted to making a straight line, the higher the correlation between the two variables, or the stronger the relationship. • Positive Correlation: When graphed, you get an upward slope -- that is up from left to right. • Negative Correlation: When graphed, you get a downward slope- that is down from left to right
10. 10. Write 2 observations about each of these scatter plot graphs. •
11. 11. Based on your prior knowledge make an inference as to what type of correlation you see on the graphs below.
12. 12. When making a graph from your data, all graphs: • Must have a title • Must have x (horizontal) and y (vertical) axes that are labeled • Must start at zero • Have an equal distance between each number and use 75% of the axes. • Must have a key if using more than one data set
13. 13. Does this graph have all parts that it needs?
14. 14. Graphing your variables
15. 15. What is the Independent variable represented on this graph? Dependent?
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