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Given sample data:x -1 0 1 4f 1 1 3 1The range is ;The sample variance is ;The sample standard deviation is .Round to two decimals.

Question

Given sample data:x -1 0 1 4f 1 1 3 1The range is ;The sample variance is ;The sample standard deviation is .Round to two decimals.

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Solution

Primero, calculemos el rango de los datos proporcionados.

Los valores de x x son: -1, 0, 1, 4

El rango se calcula como la diferencia entre el valor máximo y el valor mínimo de x x : Rango=Valor maˊximoValor mıˊnimo=4(1)=4+1=5 \text{Rango} = \text{Valor máximo} - \text{Valor mínimo} = 4 - (-1) = 4 + 1 = 5

Por lo tanto, el rango es 5.

Ahora, calculemos la varianza muestral (s2 s^2 ).

Primero, necesitamos encontrar la media (fˉ \bar{f} ) de los valores de f f : fˉ=fn=1+1+3+14=64=1.5 \bar{f} = \frac{\sum f}{n} = \frac{1 + 1 + 3 + 1}{4} = \frac{6}{4} = 1.5

Luego, usamos la fórmula de la varianza muestral: s2=(fifˉ)2n1 s^2 = \frac{\sum (f_i - \bar{f})^2}{n - 1}

Calculamos cada término: (11.5)2=(0.5)2=0.25 (1 - 1.5)^2 = (-0.5)^2 = 0.25 (11.5)2=(0.5)2=0.25 (1 - 1.5)^2 = (-0.5)^2 = 0.25 (31.5)2=(1.5)2=2.25 (3 - 1.5)^2 = (1.5)^2 = 2.25 (11.5)2=(0.5)2=0.25 (1 - 1.5)^2 = (-0.5)^2 = 0.25

Sumamos estos valores: (fifˉ)2=0.25+0.25+2.25+0.25=3 \sum (f_i - \bar{f})^2 = 0.25 + 0.25 + 2.25 + 0.25 = 3

Finalmente, calculamos la varianza muestral: s2=341=33=1 s^2 = \frac{3}{4 - 1} = \frac{3}{3} = 1

Por lo tanto, la varianza muestral es 1.

Ahora, calculemos la desviación estándar muestral (s s ).

La desviación estándar muestral es la raíz cuadrada de la varianza muestral: s=s2=1=1 s = \sqrt{s^2} = \sqrt{1} = 1

Por lo tanto, la desviación estándar muestral es 1.

Resumiendo: El rango es 5; La varianza muestral es 1; La desviación estándar muestral es 1.

This problem has been solved

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