# A.1.15 Learning Goal

I can compare and contrast situations using measures of center and measures of variability.

**:**__Here is a list of some the ideas we have explored____Measures of center__: Mean & Median; these give the average value of a set of data__Measures of variability (spread)__: MAD, standard deviation, and IQR; large numbers mean data is spread out around the center, small numbers mean data is clumped close to the measure of center. When data is*symmetric*(or close to symmetric) we use mean and standard deviation to analzye. When data is*skewed or has outliers*we use median and IQR to analzye.## New Resources

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