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Bell Ringer #7

Bell Ringer #7. Evaluate (p/3t)/6 when p = 6 and t = 4 (2m 2 + 5) – (m + 1) when m = 3. Scatter Plots and Correlation. Mr. Haupt. Scatterplots. A graph that relates two groups of data. Plotted as ordered pairs. ( x,y )

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Bell Ringer #7

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  1. Bell Ringer #7 • Evaluate (p/3t)/6 when p = 6 and t = 4 (2m2 + 5) – (m + 1) when m = 3

  2. Scatter Plots and Correlation Mr. Haupt

  3. Scatterplots • A graph that relates two groups of data. • Plotted as ordered pairs. (x,y) • Most of the time, they are in the first quadrant of a coordinate plane.

  4. Example #1

  5. Correlation • When we compare two sets of data, there are three results. • Positive correlation • Negative correlation • No correlation

  6. Positive Correlation • Positive correlation is when both sets of data increase together. • It does not mean that one thing causes the other, it just means that when one goes up, so does the other.

  7. Example #2

  8. Negative Correlation • Negative correlation means that as one data set increases, the other one decreases. • Again, it does not mean that one set of data causes the other one to increase/decrease.

  9. Example #3

  10. No Correlation • Sometimes, data sets are not related at all. In this case we can say there is no correlation. • These graphs look a mess.

  11. Example #4 I woke up like this!

  12. Trend Line • To show correlation more clearly, we usually draw a trend line onto a scatter plot. • A trend line, for the most part, splits the data, and it follows the trend that the points make. • They help us to approximate the value of one set of data when given a value for the second.

  13. Example #5

  14. So…. • Go ahead and make a scatter plot from the following data: • Draw a trend line. • Is there positive, negative, or no correlation?

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