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SD
REG
SD
Calcoli statistici
Deviazione standard
Utilizzare il tasto F per entrare nel modo SD quando
si vogliono eseguire calcoli statistici usando la
deviazione standard.
SD ...................................................................F 2
•Iniziare sempre l’introduzione dei dati con A B 1
(Scl) = per cancellare la memoria statistica.
•Immettere i dati usando la sequenza di tasti mostrata di
seguito.
<
x-data> S
•I dati introdotti vengono usati per calcolare i valori per n,
Σx, Σx
2
, o , σn, e σn-1, che è possibile richiamare
utilizzando le operazioni con i tasti indicate qui accanto.
Per richiamare questo tipo di valore:
Eseguire questa operazione con i tasti:
Σx
2
A U 1
Σx A U 2
n A U 3
o A X 1
σn A X 2
σn-1 A X 3
Esempio: Per calcolare σnҀ1, σn, o, n, Σx, e Σx
2
per i
seguenti dati: 55, 54, 51, 55, 53, 53, 54, 52
Nel modo SD:
A B 1
(Scl) = (Stat clear)
55
S
1.
n=
SD
Ogni volta che si preme S per registrare la vostra
introduzione, il numero di dati immessi fino a quel punto
viene indicato sul display (valore n).
54 S 51 S 55 S
53 S S 54 S 52 S
Deviazione standard del campione (σnҀ1) =
1,407885953
A X 3 =
25


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