Week 7-8 Reflection Statistics and Definitions Mean - Averaging. Add the values and divide by how many values are on the list. Median - Middle number. Arrange values from lowest to highest, median will be the middle number or the average of the 2 middle numbers. Mode - Refers to the value in the list that occurs most often. Range - The difference between the smallest and largest value. We also learned how to represent data using a Normal Curve and Standard Deviation. Normal Curves are bell curves that represent usual distribution where Standard Deviation shows the distance scores depart from the mean. The lower the Standard Deviation, the closer the score is to being average. To compare scores/progress on a particular dimension, we can use either the Z-Score or T-Score to convert raw data. Data Driven instruction There are several decisions that a teacher can make about instruction based on assessment results. A teacher can decide to reteach content that students may need more assistan...