1. Measures of Central Tendency

2. The sum of a set of numbers divided by the total number of addends.
Mean
Definition:
The sum of a set of numbers divided by the total number of addends.
Synonym:
Average
1, 1, 2, 3, 4, 4, 4, 5
Notice!...Data is listed in order from least to greatest!!!
Mean= 3

3. Median Definition: Synonym:
The middle number of an odd number of data items arranged in order. 
For an even number of data items, the median is the mean of the two middle numbers.
Synonym:
Middle
A) 10, 11, 20, 36, 49, 57, 60
Median is 28
B) 10, 11, 20, 36, 57, 60

4. The value or values, that occur most often in a set of data.
Mode
Definition:
The value or values, that occur most often in a set of data. 
Synonym:
Most often 4
A) 1, 1, 2, 3, 4, 4, 4, 5, 6
1 and 4
B) 1, 1, 1, 2, 3, 4, 4, 4, 5, 6
none
C) 1, 2, 3, 4, 5, 6

5. The difference between the largest and the smallest data value.
Range
Definition:
The difference between the largest and the smallest data value.
1, 1, 2, 3, 4, 4, 4, 5, 6
Range is 5

6. Choosing an Appropriate Display
Use a bar graph to
display and compare data.

7. Choosing an Appropriate Display
Use a dot plot to show the frequency of values.

8. Choosing an Appropriate Display
Use a box plot to show the distribution of two different groups. You can compare the shapes, centers, and spreads of box plots.

9. Choosing an Appropriate Display
Use a circle graph to show how a set of data is divided into parts of a whole. (percents)

10. Choosing an Appropriate Display
Use a line graph to show how data change over a period of time.

11. Choosing an Appropriate Display
Use a Venn Diagram to show relationships between two or more data sets.