HP HP-67 - Page 119

Function Keys 115
N
Age
|62
58
6
73
84
68
Net
Worth
|1200
1500
1450
1950
1000
1750
Press Display
o
0
Ensures
that
secondary
storage registers used for
accumulations are cleared
to zero initially. (Display
assumes no results remain
from previous examples. )
Number of data pairs
(n)is 1.
62 1200 513
58 1500 (2
62 1450 (13 3.00
73 1950 523
84 1000 (22
68 1750 B2
Number of data pairs
(n) is 6.
a 1475.00 Average value of net
worth.
0
67.83
Average
age
of
the
sample.
86
347.49
Standard
deviation
(sy)
of net worth of sample.
Standard deviation (s,)
of age of sample.
Q =)
If the six persons used in the sample were actually the six wealthiest
persons, the data would have to be considered as a population
rather than as a sample. The relationship between sample standard
deviation (s) and the population standard deviation (o) is illustrated
by the following equation.