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F-20
Il faut toujours d’abord appuyer sur A m = pour vider
la mémoire statistique avant de saisir des données.
Les données saisies servent à calculer
les valeurs de
n, Σx, Σx
2
, o, σn et σn-1
que vous pouvez rappeler avec les
opérations de touches indiquées ci-
contre.
Exemple: Calculer
σnҀ1, σn, o, n, Σx et Σx
2
pour les
données suivantes : 55, 54, 51, 55, 53, 53, 54, 52
Entrez dans le mode SD F F 1
A m = (effacement de mémoire)
55
S 54 S 51 S 55 S
53 S S 54 S 52 S
(Écart-type sur échantillon σnҀ1) A N =
cart-type sur population σn) A A =
(Moyenne arithmétique o) A M =
(Nombre de données n) 0 k
(Somme des valeurs Σx) 0 H
(Somme des carrés des valeurs Σx
2
) 0 G
Précautions concernant la saisie de données
S S entre deux fois les mêmes données.
•Vous pouvez aussi effectuer une entrée multiple des
mêmes données en utilisant
A G. Pour entrer dix fois
le chiffre 110, par exemple, appuyez sur 110
A G 10
S.
Les résultats précédents peuvent être obtenus dans
n’importe quel ordre, pas nécessairement dans l’ordre
indiqué ci-dessus.
•Pour supprimer des données qui viennent d’être entrées,
appuyez sur
A U.
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
22


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