TABLE 12-13
Recent studies have found that American children are more obese than in the past.The amount of time children spent watching television has received much of the blame.A survey of 100 ten-year-olds revealed the following with regards to weights and average number of hours a day spent watching television.We are interested in testing whether the mean number of hours spent watching TV and weights are independent at 1% level of significance.
-To use the Wilcoxon Rank Sum Test as a test for location,you must assume that
A)the obtained data are either ranks or numerical measurements that will be converted to combined ranks.
B)both samples are randomly and independently drawn from their respective populations.
C)both underlying populations from which the samples were drawn are equivalent in shape and dispersion.
D)All of the above.

Question

TABLE 12-13
Recent studies have found that American children are more obese than in the past.The amount of time children spent watching television has received much of the blame.A survey of 100 ten-year-olds revealed the following with regards to weights and average number of hours a day spent watching television.We are interested in testing whether the mean number of hours spent watching TV and weights are independent at 1% level of significance. 
-To use the Wilcoxon Rank Sum Test as a test for location,you must assume that
A)the obtained data are either ranks or numerical measurements that will be converted to combined ranks. 
B)both samples are randomly and independently drawn from their respective populations. 
C)both underlying populations from which the samples were drawn are equivalent in shape and dispersion. 
D)All of the above.

Quizplus · Accepted Answer

The Wilcoxon Rank Sum Test requires that data are ranks or can be ranked, samples are randomly and independently drawn, and populations have similar shape and dispersion.

TABLE 12-13 Recent Studies Have Found That American Children Are More Obese