a. One group of mommies has played classical music for their babies every day fo

Question

a. One group of mommies has played classical music for their babies every day for 6 months while another group of mommies has not. The babies were tested at the end of six months, to test for statistical significance, on whether their babies had developed motor coordination skills or not.

b. College freshmen with test anxiety are assigned to three groups. One group receives free individualized counseling, one group participates in a class to teach them how to reduce their anxiety, and the third group receives no treatment. They are tested to determine if there is a significant difference in the anxiety level (high, medium, and low).

c. A survey of local residents has been conducted to determine the level of support for a new shopping plaza. Those surveyed were allowed to respond in one of five categories – strongly support, support, no opinion, do not support, strongly do not support. The residents were surveyed as they entered the new shopping plaza and then the same survey was sent out again to them two weeks later.

Explanation / Answer

Wilcoxon Rank-sum test:
Here we have to use the wilcoxon rank-sum test, because we have two independent continuous populations music with babies and music without babies have the same shape and spread and differ only in their locations.
It is also called the Mann-whitney test for quantitative data.
Kruskal-Wallis test:
We must use Kruskal-wallis test, because we have three samples from the same population. We have to compare the means of three samples. Mann-whitney test: It is Mann-whitney test, because we have qualitative data with large samples.

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