Answer:
Median refers to the mid-value of a group. Simplistically, it refers to the number in the middle of a fixed given quantity group.
Range refers to the difference between the smallest value and the largest value in the quantity group.
In this case, the treatment group scores have a median of 10.9, which means its mid-value is 10.9. The range is 2.1, which means the difference between the smallest and the largest value is 2.1 in the set of data.
The no-treatment group scores have a median of 2.7, which means its mid-value is 2.7. The range is 0.8, which means the difference between the smallest and the largest value is 0.8 in the set of data.