FORMULARI ESTADÍSTICA I
Distribució de freqüències
Estadístics de síntesis
X=
Xi
∑
n
n
Xn
Xii
∑
=
n
Xn
Xii
T
∑
=
( )
N
XX i
X
∑−
=
2
σ
( )
1
2
−
−
=∑
n
XX
Si
X
100
X
S
CV X⋅=
mínmàx XXAT −=
13 QQAI −=
Cr =z4−3
As =z3
( ) ( )
( )
13
1223
QQ
QQQQ
As −
−−−
=
X
i
iS
XX
z−
=
( )( )
[ ]
n
YYXX
Sii
XY
∑−−
=
rXY =SXY
SXSY
( )
1
6
12
2
−
−=∑
nn
di
XY
ρ
( )
n
ff
fsent
f
ff cf
t
t
te ∑ ∑
∑⋅
=
−
=
2
2
χ
( )
1
2
−
=kn
V
χ
Y'=A+BX
y'=Bx
zY
'=rXY ⋅zX
SY
2=SY'
2+Se
2
rxy
2=SY'
2
SY
2
E X
( )
=
µ
=Xi
∑⋅f xi
( )
E(Binomial)=n⋅p
100100
1⋅=⋅====
∑
=
iiii
i
i
i
i
i
i
i
ipaPapP
N
na
pa
N
n
p
N
n
na