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Scatter plots, relationships, and Trend lines

Scatter plots, relationships, and Trend lines. Objective: Learn to read and interpret scatter plots. Learn to make scatter plots. Learn to draw trend lines. Scatter plots are used to investigate the relationship between two sets of numbers. A scatter plot with a POSITIVE RELATIONSHIP.

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Scatter plots, relationships, and Trend lines

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  1. Scatter plots, relationships, and Trend lines Objective: Learn to read and interpret scatter plots. Learn to make scatter plots. Learn to draw trend lines.

  2. Scatter plots are used to investigate the relationship between two sets of numbers. A scatter plot with a POSITIVE RELATIONSHIP A scatter plot with a NEGATIVE RELATIONSHIP • When 2 sets of data increase at the same time, the sets show a positive relationship. A scatter plot of a positive relationship slants upward to the right. When 1 set of data increases as the other decreases, the set shows a negative relationship. A scatter plot of a negative relationship slants downward to the right.

  3. When 2 sets of data neither increase nor decrease together, they show no relationship • When sets of data show a positive or negative relationship, you can draw a trend line to approximate the data. • By extending the trend line you can make predictions about the future.

  4. Steps to drawing a scatter plot: 1. Choose a scale. 2. Mark the interval on each axis. 3. Label both axes. 4. Plot the points. 5. What kind of relationship does the scatter plot show?6. Draw a trend line. Your Example: Draw a scatter plot and a trend line for this data.

  5. Homework: Scatter plots Determine whether each data set shows a positive, a negative, or no relationship.

  6. Homework: You also have to bring the M&M bag and any materials you might need for tomorrow!! We start our project!!!!! 

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