STATISTICS!

MEAN

Average- Add the numbers in your set and divide by
the amount of numbers in your set. Combine and divide
out equally.

MEDIAN

The Middle Number. Order your numbers
from least to greatest, then find the middle number.

MODE

The number that occurs the MOST in a set.
You CAN have more than one mode.

Be careful of SKEWING or SKEWED data!!

Remember to include a
number line underneath
(to keep things evenly
spaced and to scale)

OUTLIERS- How to figure out if numbers in a set of data are outliers:

IQR= Inter Quartile Range or, the distance between the lower quartile and the upper quartile. To be an Outlier, the number must be at least 1.5 X IQR.

Example: The Lower quartile is 13 and the Upper Quartile is 17... The IQR is 4. 1.5 X 4 = 6. So for a number in the data set to be an Outlier it must be +/- 6 from the quartiles.

Subtopic

Quartiles: Divide the data set into four sections.
Each section containing about 1/4 of the data.

QL: The lower quartile, find the median of the LOWER SET of data points.

QU: The upper quartile, find the median of the upper set of data points

*Formula will always be given

Used to create Bell Curve

Measure of the center is the MEAN