JMP Output for the Distribution of Body Mass of Canidae
12
8
6
Count
10
4
2
0
5
10
15
20
25
30
35
100.0%
75.0%
50.0%
25.0%
0.0%
maximum
quartile
median
quartile
minimum
Leaf
6
Count
1
5
23
1
2
23
001
899
6667
44455555
333
1
2
3
3
4
8
3
1
40
Body Mass (kg)
Quantiles
Stem
3
3
3
3
2
2
2
2
2
1
1
1
1
1
0
0
0
0
0
0|1 represents 1
Moments
36.000 Mean
10.750 Std Dev
6.000 N
4.250
1.000
9.2857143
8.0224553
28
Note that JMP does the stem-and-leaf display slightly differently than what has been presented in
class and in the text. It is a vertical display with larger numbers at the top. Also, JMP splits each
stem into 5 pieces.
Note also that JMP calculates the 75% quartile (Q3) and 25% quartile (Q1) slightly differently.
The outlier box plot created by JMP has extra features. The center of the diamond is the value of
the sample mean. The bracket under the box plot shows were the densest 50% of the data are.
Note how the shape of the box plot matches the shape of the histogram. Both indicate a
distribution that is skewed toward larger values or a distribution that is fairly mounded and
symmetric between 0 and 15 kilograms with 4 potential outliers.