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Consider a sample with data values of 10, 20, 12, 17, and 16. Compute the variance and standarddeviation.

Question

Consider a sample with data values of 10, 20, 12, 17, and 16. Compute the variance and standarddeviation.

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Solution

Para calcular la varianza y la desviación estándar de los valores de la muestra 10, 20, 12, 17 y 16, sigue estos pasos:

  1. Calcular la media (promedio) de los datos: Media=10+20+12+17+165=755=15 \text{Media} = \frac{10 + 20 + 12 + 17 + 16}{5} = \frac{75}{5} = 15

  2. Calcular la suma de los cuadrados de las diferencias entre cada valor y la media: (1015)2=(5)2=25 (10 - 15)^2 = (-5)^2 = 25 (2015)2=52=25 (20 - 15)^2 = 5^2 = 25 (1215)2=(3)2=9 (12 - 15)^2 = (-3)^2 = 9 (1715)2=22=4 (17 - 15)^2 = 2^2 = 4 (1615)2=12=1 (16 - 15)^2 = 1^2 = 1

  3. Sumar estos valores: 25+25+9+4+1=64 25 + 25 + 9 + 4 + 1 = 64

  4. Dividir esta suma entre el número de datos menos uno (n - 1) para obtener la varianza: Varianza=6451=644=16 \text{Varianza} = \frac{64}{5 - 1} = \frac{64}{4} = 16

  5. Calcular la desviación estándar tomando la raíz cuadrada de la varianza: Desviacioˊn estaˊndar=16=4 \text{Desviación estándar} = \sqrt{16} = 4

Por lo tanto, la varianza es 16 y la desviación estándar es 4.

This problem has been solved

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