GATE (Graduate Aptitude Test in Engineering) Ecology & Evolution (EY): Questions 1 of 455

Appeared in Year: 2016

Question MCQ▾

The use of Kruskat Wallis test is most appropriate in which of these cases? (June)

Choices

Choice (4)Response

a.

There are two groups and each group is normally distributed.

b.

There are more than two groups and each group is normally distributed.

c.

There are two groups and the distribution in each group is not normal.

d.

There are more than two groups and the distribution in each group is not normal.

Edit

Answer

d.

Explanation

  • Kruskat Wallis test is a non-parametric rank based test. It is also known as one-way ANOVA of ranks. It is an extension of Mann-Whitney U test to allow the comparison of more than two independent groups. It is used to determine the significant difference between 2 or more groups of independent variable on a continuous or ordinal dependent variable.
  • The KruskalWallis test by ranks, KruskalWallis H test (named after William Kruskal and W. Allen Wallis) , or one-way ANOVA on ranks is a non-parametric method for testing whether samples originate from the same distribution. It is used for comparing two or more independent samples of equal or different sample sizes.
  • It is used to test whether samples originate from the same distribution. It is used to compare 2 or more independent samples of equal or different size. It does not assume a normal distribution unlike one way ANOVA.

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