#### Understanding

Dot plots display data in a way that makes it easier to identify the median of a set of data. This knowledge of median is the foundation for understanding interquartile ranges.

### What to look for

Students should note that there are the same number of points to the left and to the right of the median; regardless of the shape of the distribution.### Sample Assessment

Identify the following as true or false.

a. The median is the midpoint between the smallest and largest values in the data set.

Answer: False

b. At most half of the values in a data set have values less than the median.

Answer: True

c. If you add 10 to every element of a data set, the median will not change.

Answer: False

d. If you add 10 to every element of a data set, the IQR will not change.

Answer: True