Cours proba 1 Flashcards

1
Q

valeur numerique
oui ?
non ?

A

valeur numerique
oui -> quantitative
non -> qualitative

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2
Q

Quantitative

peut on les numeroter ?

A

oui : discrete

non : continue

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3
Q

qualitative

ont elles un ordre

A

oui : ordinale

non : catégorielles

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4
Q

diagramme en baton

A

pour qualitative ou quantitative discrete

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5
Q

histogramme

A

pour quantitative continue ou discrete avec bcp de valeurs

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6
Q

mode

A

= valeur la plus frequence

abscisse du sommet

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7
Q

si distribution symetrique et unimodale

A

mode = moyenne = mediane

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8
Q

si distribution asymetrique
a droite :
a gauche :

A

a droite : mode < mediane < moyenne

a gauche : mode > mediane > moyenne

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9
Q

etendue

A

max - min

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10
Q

variance

A

V(X) = 1/n somme ni (xi -moyenne)^2 =

1/n somme xi^2 - (somme xi)^2 / n

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11
Q

ecart type

A

= racine de variance

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12
Q

P(AouB)

A

P(A) + P(B) - P(A et B)

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13
Q

p(A/B)

A

P(A et B) / P(B)

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14
Q

evenement independant si

A

p(b) = p(B/A) = p(B/ pas A)

p(B et A) = P(A) x P(B)

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15
Q

sensibilite

specificite

A
sensibilite = P(test+ / malade)
specificite = P(test- / pas malade)
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16
Q

VPP

VPN

A
VPP = P(malade/testpo)
VPN = P(pasmalade/testneg)