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I-19
Calcoli statistici
k Deviazione standard (modo SD)
•Premere F F 1 (fx-85W) per entrare nel modo SD
per eseguire i calcoli statistici usando la deviazione stand-
ard. Per gli altri modelli, premere
F 2
.
•L’introduzione dei dati inizia sempre con
A m = per
cancellare la memoria statistica.
•I dati introdotti vengono usati per calco-
lare i valori per
n, Σx, Σx
2
, o, σn e σn-1,
che è possibile richiamare usando le
operazioni di tasto indicate qui accanto.
Esempio: Per calcolare
σnҀ1, σn, o, n, Σx, e Σx
2
per i
seguenti dati : 55, 54, 51, 55, 53, 53, 54, 52
Entrare nel modo SD.
fx-85W:
F F 1
Altri modelli:
F 2
A m = (Cancellazione della memoria)
55
S 54 S 51 S 55 S
53 S S 54 S 52 S
A N =
A A =
(Media aritmetica o) A M =
(Numero di dati n) 0 k
(Somma di valori Σx) 0 H
(Somma dei quadrati dei valori Σx
2
) 0 G
0 1 Σx
2
0 2 Σx
0 k n
A M o
A A σn
A N σn-1
52.
00
SD
1.407885953
00
1.316956719
00
53.375
00
8.
00
22805.
00
427.
00
(Deviazione standard del campione
σnҀ1)
(Deviazione standard della popola-
zione σn)
21


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