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8. find the sample standard deviation of the following set of scores, c…

Question

  1. find the sample standard deviation of the following set of scores, correct to two decimal places, by using the statistics mode on the calculator: 2, 11, 7, 14, 4, 6, 9, 16, 8, 3 sample standard deviation = enter your next step here

Explanation:

Step1: Calcular la media

La media $\bar{x}=\frac{2 + 11+7 + 14+4 + 6+9 + 16+8 + 3}{10}=\frac{80}{10}=8$.

Step2: Calcular las diferencias al cuadrado

$(2 - 8)^2=(-6)^2 = 36$, $(11 - 8)^2=3^2 = 9$, $(7 - 8)^2=(-1)^2 = 1$, $(14 - 8)^2=6^2 = 36$, $(4 - 8)^2=(-4)^2 = 16$, $(6 - 8)^2=(-2)^2 = 4$, $(9 - 8)^2=1^2 = 1$, $(16 - 8)^2=8^2 = 64$, $(8 - 8)^2=0^2 = 0$, $(3 - 8)^2=(-5)^2 = 25$.

Step3: Calcular la suma de las diferencias al cuadrado

$36+9 + 1+36+16+4+1+64+0+25 = 192$.

Step4: Aplicar la fórmula de la desviación estándar muestral

La desviación estándar muestral $s=\sqrt{\frac{\sum_{i = 1}^{n}(x_i-\bar{x})^2}{n - 1}}$, donde $n = 10$. Entonces $s=\sqrt{\frac{192}{9}}\approx\sqrt{21.333\cdots}\approx4.62$.

Answer:

$4.62$