Match each measure of dispersion with its definition:

1. Range
2. Variance
3. Standard Deviation
4. Interquartile Range (IQR)

A. The difference between the largest and smallest data points.

B. A measure of spread that shows how data points differ from the mean, squared.

C. A measure of how far data points deviate from the mean, in the original units.

D. The range between the first and third quartiles of the data, representing the middle 50%.