2. Why?
Descriptive statistics do just that:
Describe Data!
What we’ll cover in this slidecast
– Mean (average)
– Median
– Mode
– Range
3. Mean
Fancy Formula What this means: add
µ = ΣX/N up all your data, then
divide by the number
of data points
4. Mean
Sample data: How to calculate:
98cm
76cm 98+76+82+54+90 =
82cm 400cm
54cm
90cm 400cm/5 = 80cm
5. Median
The median is the middle data point in a
set
To determine the median, sort the data
from smallest to largest and find the
middle data point
9. Mode
The mode is the most frequently occurring
data point.
To find the mode, arrange the data from
smallest to largest, and then determine
which amount occurs most often.
11. Range
The range is the distance between the
smallest and largest data point.
To calculate, determine the smallest data
point and the largest data point, then
subtract the smallest from the largest.