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114
Function Keys
2. Sample y standard deviation (sy) is calculated using the data
accumulated in storage registers Rg; (2y?), Rgg (2y), and Rgg
(n) according to the formula:
The resultant value for standard deviation of y (sy) is available
in the Y-register of the stack.
Thus, with data first accumulated in secondary storage registers Rgy,
through Rgg, when you press ) (5], the contents of the stack registers
are changed...
...from this...
...to this.
T
t
—_—
t
T
Zz
z
—_—
z
Zz
Y
vy
—»Jost
Sy
Y
X
X
sx
X
- \h—>@ LAST X
To use the value for standard deviation of y (sy) simply use the
key to bring that value into the displayed X-register of the stack.
Example: In a recent survey to deter-
mine the age and net worth (in millions
of dollars) of six of the 50 wealthiest
persons in the United States, the fol-
lowing data were obtained (sampled).
Calculate the average age and net worth
of the sample, and calculate the
standard deviations for these two sets
of data.
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