Module 3: Univariate displays
(The attached PDF file has better formatting.)
Homework assignment: stem and leaf display
A stem and leaf display for assault rates in the fifty U.S. states appears below. The assault rates range from 4.5% to 33.7%.
4 | 568
5 | 367
6 |
7 | 2
8 | 136
9 |
10 | 2699
11 | 035
12 | 000
13 |
14 | 59
15 | 1699
16 | 1
17 | 48
18 | 8
19 | 0
20 | 14
21 | 1
22 |
23 | 68
24 | 99
25 | 2459
26 | 3
27 | 69
28 | 5
29 | 4
30 | 0
31 |
32 |
33 | 57
A. What is the median assault rate? There are 50 states, so average two points.
B. What is the lower hinge (the 25th percentile)?
C. What is the upper hinge (the 75th percentile)?
D. What is the value of (HU – Median) / (Median – HL), where HU is the upper hinge and HL is the lower hinge?
E. This ratio indicates the skewness of the distribution. Is this distribution positively skewed or negatively skewed?