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Make Predictions from Scatter Plots

Make Predictions from Scatter Plots. Make Predictions. Scatter Plots show a positive trend if y tends to increase as x increases or if y tends to decrease as the x decreases. Scatter Plots show a negative trend if one value tends to increase and the other tends to decrease.

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Make Predictions from Scatter Plots

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  1. Make Predictions from Scatter Plots

  2. Make Predictions • Scatter Plots show a positive trend if y tends to increase as x increases or if y tends to decrease as the x decreases. • Scatter Plots show a negative trend if one value tends to increase and the other tends to decrease. • A scatter plot shows no trend (correlation) if there is no obvious pattern. • If there is a trend, positive or negative, we can use the line of best fit to make predictions. NEGATIVE POSITIVE NO CORRELATION

  3. History Vs. Math • Here is a scatter plot showing the relationship between students who took a History Test and a Math Test. • Is there a relationship between the scores? • Describe the relationship.

  4. History Vs. Math • Since there is a positive correlation with the data, predict what a student who earned a 75% on their history test earned on their math test. • What can I draw that will help me make that prediction?

  5. History Vs. Math • The line of best fit will help you make a prediction as to what score the student would get on their math test if they earned a 75% on their history test. • What score would he get on the math test? 75% on History Test About 77%

  6. Population of Goldfish & Star fish • The following table shows the population between goldfish and star fish at different aquariums. • Is there a relationship in this data? • What can we draw to see if there is a relationship? • Draw a scatter plot 

  7. Goldfish & Star Fish • Is there a relationship with this data? • What kind of relationship is it? • If I have a goldfish population of 15, how many star fish will there be? • What can I draw to help me make that prediction?

  8. Goldfish & Star Fish • Draw a line of best fit. • If I have a goldfish population of 15, how many star fish will there be? • There would be about 26 star fish.

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