Descriptive Statistics

What does 'mean' measure in a data set?

The average — the sum of all values divided by the number of values

What does 'median' measure in a data set?

The middle value when the data is arranged in order

What does 'mode' measure in a data set?

The value that appears most often in the data set

What does 'range' measure in a data set?

The spread of the data — the difference between the maximum and minimum values

What is an outlier?

A data value that is much higher or lower than the rest of the data set