Introductory Biostatistics

children at a day-care center are as follows:

68 63 42 27 30 36 28 32 79 27

22 23 24 25 44 65 43 25 74 51

36 42 28 31 28 25 45 12 57 51

12 32 49 38 42 27 31 50 38 21

16 24 69 47 23 22 43 27 49 28

23 19 46 30 43 49 12

A stem-and-leaf diagram consists of a series of rows of numbers. The num-
ber used to label a row is called astem, and the other numbers in the row are

Figure 2.9 Mean stature by age for refugee girls.

TABULAR AND GRAPHICAL METHODS 71