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4. Habiendocalculadolosvaloresde laresistenciade lasegundatabla,realice el ajuste por
mínimoscuadradosde losvalores,obtengalaecuaciónde lacurva apropiadae indique la
incertidumbre de laexperiencia.
9. ¿Qué indicala varianza?
la Varianzaesuna medidade dispersiónque se utilizapararepresentarlavariabilidadde un
conjuntode datosrespectode la mediaaritméticade losmismo.Así,se calculacomola suma
de losresiduoselevadosal cuadradoy divididosentre el total de observaciones.
interpretandose comoel riesgode que el rendimientode algunprocedimientoenconcretosea
distintodel rendimientoesperadode dichoprocedimiento
la varianzaesuna de las medidasde dispersionporexcelencia.
Fórmulapara calcularla varianza
La unidadde medidade lavarianzaserásiempre launidadde medidacorrespondientealos
datospero elevadaal cuadrado.La varianzasiempre esmayoroigual que cero.Al elevarse los
residuosal cuadradoesmatemáticamente imposibleque lavarianza salganegativa.Yde esa
formano puede sermenorque cero.
Var(X) =
∑ (𝑥𝑖−𝑋)
̅̅
̅̅2
𝑛
1
𝑛
Es decir:
Var(X) =
(𝑥1−𝑋)
̅̅
̅̅2+ (𝑥2−𝑋)
̅̅
̅̅2+ (𝑥3−𝑋)
̅̅
̅̅2+ (𝑥4−𝑋)
̅̅
̅̅2+⋯ (𝑥𝑛−𝑋)
̅̅
̅̅2
𝑛
Donde
X: variable sobre laque se pretendencalcularlavarianza
xi:observaciónnúmeroi de lavariable X.i puede tomarávaloresentre 1 y n.
n: númerode observaciones.
x̄: Es la mediade lavariable X.

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Jean metro avanza

  • 1. 4. Habiendocalculadolosvaloresde laresistenciade lasegundatabla,realice el ajuste por mínimoscuadradosde losvalores,obtengalaecuaciónde lacurva apropiadae indique la incertidumbre de laexperiencia. 9. ¿Qué indicala varianza? la Varianzaesuna medidade dispersiónque se utilizapararepresentarlavariabilidadde un conjuntode datosrespectode la mediaaritméticade losmismo.Así,se calculacomola suma de losresiduoselevadosal cuadradoy divididosentre el total de observaciones. interpretandose comoel riesgode que el rendimientode algunprocedimientoenconcretosea distintodel rendimientoesperadode dichoprocedimiento la varianzaesuna de las medidasde dispersionporexcelencia. Fórmulapara calcularla varianza La unidadde medidade lavarianzaserásiempre launidadde medidacorrespondientealos datospero elevadaal cuadrado.La varianzasiempre esmayoroigual que cero.Al elevarse los residuosal cuadradoesmatemáticamente imposibleque lavarianza salganegativa.Yde esa formano puede sermenorque cero. Var(X) = ∑ (𝑥𝑖−𝑋) ̅̅ ̅̅2 𝑛 1 𝑛 Es decir: Var(X) = (𝑥1−𝑋) ̅̅ ̅̅2+ (𝑥2−𝑋) ̅̅ ̅̅2+ (𝑥3−𝑋) ̅̅ ̅̅2+ (𝑥4−𝑋) ̅̅ ̅̅2+⋯ (𝑥𝑛−𝑋) ̅̅ ̅̅2 𝑛 Donde X: variable sobre laque se pretendencalcularlavarianza xi:observaciónnúmeroi de lavariable X.i puede tomarávaloresentre 1 y n. n: númerode observaciones. x̄: Es la mediade lavariable X.