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116
Function Keys
Since n is automatically accumulated in secondary register Rgg when
data is accumulated, it is a simple matter to convert the sample
standard deviations which have already been calculated to population
standard deviations.
If the accumulations are still intact from the previous example in
secondary registers Rg, through Rgg, you can calculate the population
standard deviations this way:
Press
Display
B
Calculate s, and s,.
0
9
Recall n.
16
Calculate n — 1.
96
Divide n — 1 by n.
&
317.21
Population standard
deviation oy.
0
Brings sy to the
X-register.
0
Recall conversion factor.
8
Population standard
deviation oy.
Remember that the accumulations must always be stored in the
secondary bank of storage registers. Thus, if you have accumulated
data using
and then brought the summations out to the primary
registers for viewing using (£x5], you will have to replace them in
the secondary registers by pressing
again before pressing
or (5.
Deleting and Correcting Data
If you key in an incorrect value and have not pressed 51, press
and key in the correct value.
If one of the values is changed, or if you discover after you have
pressed the (5 key that one ofthe values is in error, you can correct
the summations by using the [£-] (summation minus) key as follows:
1. Key in incorrect data pair into the X- and Y-registers. (You
can use
to return a single incorrect data value to the
displayed X-register.)
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