1. 5 Number Summaries

2. Five-Number Summary Minimum Value Lower Quartile (Q1) Median (Q2)
Upper Quartile (Q3)
Maximum Value

3. Quartiles The first 25% of the data or the lower 25% of the data is Q1
The middle value between lowest value of the data set and median
50% of the data is Q2 or the median
75% of the data is below Q3, this separates the top 25% of the data from the rest of the 75% of the data
The middle value between the median and the highest value in the data set

4. IQR
Interquartile Range
IQR= Q3- Q1

5. Example
Find the 5-Number Summary, range and interquartile Range of the following set of data. 1,2,3,4,5,6,70
Remove the outlier of 70. Find the 5-Number summary, range, and interquartile range.
Which changed more the range or IQR?