STA 3024 Exam 1 Sample Questions

130. Suppose that, in ranking observations for the Mann-Whitney U test, there is a three-way tie forthe smallest observation. According to the method recommended in class (the midrank method),what ranks should we assign to those three observations?(A) 1, 1, 1(B) 1, 1.5, 2(C) 1.5, 1.5, 1.5(D) 2, 2, 2131. Which one of the following statements about nonparametric methods is true?(A) They are not reliable when the response variable has a skewed distribution.(B) They should be avoided when the data contains outliers.(C) They are most useful when the response variable has a normal distribution.(D) They can be used when the data consists of only rankings.132. Which of the following statements about the Mann-Whitney U test is true?(A) The null hypothesis is just that the two groups have the same mean, not necessarily thesame distribution.(B) The null hypothesis is that the two groups have the same distribution.(C) It assumes a random sample and just that each group has a symmetric distribution, notnecessarily a normal distribution.(D) It assumes a random sample and that each group has a normal distribution.133. Suppose that in conducting a Mann-Whitney U test, two observations are tied for third-smallest.According to the method recommended in class (the midrank method), what ranks should beassigned to those two observations?(A) 3.5, 3.5(B) 4, 4(C) 3, 3.5(D) 3.5, 4134. Which of the following does the Mann-Whitney U test actually test?(A) whether a population has a normal distribution(B) whether two groups have the same distribution or different distributions(C) whether a population has a median of zero(D) whether the distribution of the difference scores of matched pairs data has a median of zero