Using Box Plots to Make Inferences
Creating a Box Plot
1. order from least to greatest
2. Lower extreme—lowest number
3. First quartile—middle of lower-half
4. Median—middle number
5. Third quartile—middle of upper half
6. Upper extreme—largest number
Use the given data to make a box-and-whisker plot:
9, 2, 0, 4, 6, 3, 3, 2, 5
Put data from least to greatest 0, 2, 2, 3, 3,
The smallest value
, The largest value
Median
Lower quartiles 2+2=4 /2 = 2
2 2
3 3 4
4, 5, 6, 9
, Upper quartiles 5+6 =11/2 =5.5
5 6 9
The smallest value
The largest value
0,
9
Median 3
Lower quartiles 2+2=4 /2 = 2
, Upper quartiles 5+6 =11/2 =5.5
Using Proportions to Make Inferences