Monday 10-22-12

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STATISTICS!

Standard Deviation

Used to create Bell Curve

Measure of the center is the MEAN

*Formula will always be given

But just incase...

Line Plots

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

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

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

Box and Whisker

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

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

Be careful of SKEWING or SKEWED data!!

The Three Ms

MODE

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

MEDIAN

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

MEAN

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