In a two-sample t-test, there are two approaches: considering the equal variance and considering the unequal variance. What test is used to check if the variance of the two populations is equal or not?a.F testb.t testc.Z testd.Chi-square test
Question
In a two-sample t-test, there are two approaches: considering the equal variance and considering the unequal variance. What test is used to check if the variance of the two populations is equal or not?a.F testb.t testc.Z testd.Chi-square test
Solution
Para determinar si las varianzas de dos poblaciones son iguales o no, se utiliza la prueba F. A continuación, se explica paso a paso:
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Formulación de hipótesis:
- Hipótesis nula (): Las varianzas de las dos poblaciones son iguales ().
- Hipótesis alternativa (): Las varianzas de las dos poblaciones no son iguales ().
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Cálculo del estadístico F:
- Se calcula el estadístico F como la razón de las dos varianzas muestrales: donde y son las varianzas muestrales de las dos muestras.
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Determinación del valor crítico:
- Se determina el valor crítico de F a partir de la tabla de distribución F, utilizando los grados de libertad correspondientes para el numerador () y el denominador (), donde y son los tamaños de las dos muestras.
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Comparación y decisión:
- Se compara el estadístico F calculado con el valor crítico de F.
- Si calculado es mayor que el valor crítico, se rechaza la hipótesis nula, indicando que las varianzas no son iguales.
- Si calculado es menor o igual al valor crítico, no se rechaza la hipótesis nula, indicando que no hay suficiente evidencia para decir que las varianzas son diferentes.
Por lo tanto, la respuesta correcta es:
a. F test
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