Russel-Research-Method-in-Anthropology

574 Chapter 19
Stem and Leaf Plot of variable: MFRATIO, N = 50
Minimum:
Lower hinge:
83.000
96.000
Median:
Upper hinge:
98.000
101.000
Maximum: 172.000
83 0
88 0
* * * Outside Values * * *
92 0
93
94 0
95 000
96 H 000000
97 0000
98 M 0000000000
99 000000
100 00
101 H 0000
102 00
103 00
104
105 0
106 00
107 0
* * * Outside Values * * *
109 0
110 0
172 0
Figure 19.3. Stem-and-leaf plot for the variable MFRATIO in Table 19.8.
technically considered outliers. This variable looks like it’s pretty normally
distributed, with a hump of cases in the middle of the distribution and tails
going off in both directions.
Distributions Again
We can check to see if the variable is, in fact, normally distributed or
skewed by evaluating the distribution. That’s where box plots come in.
Just as a refresher, back in chapter 7, on sampling theory, we looked at