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- Good morning students, today we are going to learn how to use the outlier formula.
- hmm that sounds hard.
- Let's first look at the equations on the board and try the first question:A set of data has the lower quartile 25 and the upper quartile 50. Find the range of values for which data would be flagged as outliers.
- First condition: x < Q1 - 1.5 (Q3 -Q1)Second condition: x > Q3 +1.5 (Q3 -Q1)
- I think I understand, the lower quartile is Q1 and upper quartile is Q3.
- First condition: x < 25 - 1.5 (50 -25)Second condition: x > 50 +1.5 (50 -25)
- YES! we would just plug the numbers into the formulas.
- First condition: x < 25 - 1.5 (50-25)x < 25 - 1.5 (25)x< 25 - 37.5x < -12.5
- Exactly, let us start with the first one.
- And now we would solve right?
- Second condition: x > 50 + 1.5 (50 -25)x > 50 + 1.5 (25)x > 50 + 37.5 x > 87.5
- now lets do the second one.
- x < -12.5x > 87.5
- Does anyone know what tis means?
- Great Job! Does everyone understand?
- Yes, if a number is less than -12.5 it is an outlier and if a number is greater than 87.5 it is an outlier.
- Yes, I do. It is not as hard as I thought it would be.
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