Estadistica Inferencial Flashcards

1
Q

Uso de R

A

para explorar estadísticas y para llevar a cabo análisis estadísticos

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2
Q

Que es R

A

un lenguaje para la computación estadística, graficas y mucho mas. proyecto (software libre) GNU que es similar al lenguaje y medioambiente S

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3
Q

Creadores de R

A

Ross Ihaka y Robert Gentleman (1996)

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4
Q

Graficas exploratorias

A

entender datos
encontrar patrones
comunicar resultados

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5
Q

Inferencia de estadistica

A

Inferir a partir de una muestra

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6
Q

Cateofiras estadistica inferencial

A

1 Descriptiva/ Estimacion, prob

2 Prueba de hipotesis

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7
Q

Estimacion

A

usar datos de muestreo para describir los posibles valores de un parametro poblacional

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8
Q

Binomial

A

p(k)=nCk (p^k)(q^n-k)
E=np
Var=npq

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9
Q

Posson

A

Cosas que pasan por u de area, t long
lambda= E, var
p(k)=lambda^k*e^-lambda)/k!
lambda=np

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10
Q

Normal (x-mu,var)

A

Cuando me dan Mu8 y varianza o desv

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11
Q

Regla empirica

A

68%-! sd
95%
99.7

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12
Q

TLC 2

A

T=suma de x

Z=(T-nmu)/(mu sqrtn)

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13
Q

TLC 2

A

T=suma de x

Z=(T-nmu)/(mu sqrtn)

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14
Q

Hipostesis

A

Explcacion potencial de lo que observo. Describen relaciones de causa y efecto.
2colas-.975 Z=1.96
1 cola-Z-1.65

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15
Q

Limites inferior y supoerior Normal

A

Xprom+/-1.96sigmax
en t:
Xprom+/-t(Sx)

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16
Q

Distribucion T

A

Mu, muestra Ho, no se sigma
t=(x-mu)/Sx
df=n-1

17
Q

Tipos de errores

A

Tipo I-> Rechazo Ho cuando es verdadera

Tipo II-> Rechazo Ha cuando es T

18
Q

Formula para determinar n (iterando)

A

n=S^2 /delta^2 * (ta+tB)^2

19
Q

Chi cuadrada

A

Comparo frecuencia de una muestra con distribucion hipotetica
x2=Suma[(Fi-^Fteorica)^2/Fteo]

20
Q

Intervalos de confianza de sigma cuadrada

A

X_a/2< Sigma^2 < ((n-1)S^2)/X_1-a/2,n-1