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Real world example

Real world example. Studies of the metabolism of alcohol consistently show that  blood alcohol content (BAC), after rising rapidly after ingesting alcohol, declines linearly. 

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Real world example

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  1. Real world example Studies of the metabolism of alcohol consistently show that  blood alcohol content (BAC), after rising rapidly after ingesting alcohol, declines linearly.  For example, in one study, BAC in a fasting person rose to about 0.018 %  after a single drink.  After an hour the level had dropped to 0.010 %.  Assuming that BAC continues to decline linearly (meaning at a constant rate of change), approximately when will BAC drop to 0.002%?

  2. Real world example Need to make an equation and then use the equation to answer the question (make a prediction) Define the variables and assign each a letter to represent it We can make it a table for fun

  3. Real world example Make the equation (y intercept)  y = -.008x + .018 Make predictions! The question is "when will the BAC reach .002%?“ Plug in .002 for Y and solve for X. .002 = -.008x + .018 -.016 = -.008x x = 2 hours Therefore the BAC will reach .002% after 2 hours.

  4. Trendlines

  5. Trendlines • What if the data isn’t perfectly linear? • Can use trendlines – make predictions • Interpolations / extrapolations

  6. Trendlines • Women’s world records • Trendline - estimate of a linear function that fits the data • Legend – identifies what the dots on the chart represent. For two variable graphs we don’t really need this • Title + axes – always have these labeled • Source

  7. Prediction What is the projected record in 1999? By equation Trendline estimate

  8. How much confidence do you have in your prediction? • Data points – 7 data points is good, lower than this is not as good. • R squared (r2) • This is a measure of strength of the linear relationship between x and y. • .7 to 1 typically indicates a strong linear relationship • .4 - .7 is more moderate linear relationship • < .4 is weak and probably shouldn’t be used to make a prediction

  9. How much confidence do you have in your prediction? • Practical / Physical / Social / Political Sense ?? - Think about your prediction. What outside factors could affect it? - How far away from the data is your prediction? • What will be the record in 2100? • What was the record in 500?

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