1.Nonparametric statistical tests are (A)more capable of detecting differences among populations than parametric methods,even when normality and other assumptions are satisfied (B)almost as capable of detecting difference among populations as parametric methods,even when normality and other assumptions are satisfied. (C)usually very unsound when trying to detect differences among populations when normality and other assumptions of parametric tests are satisfied. (D)none of the above answers are correct. 2.In the case of the sing test when n is greater or equal to 25,the distribution of the number of plus signs is (A)a t distribution approximation to the binomial distribution (B)an analysis of variance problem (C)the normal approximation to the binomial distribution (D)a chi-square distribution (E)none of the above answer are correct 3.When using the Mann-Whitney U test,the null hypothesis of interest is (A)Ho:the populations have equal mean values (B)Ho:the populations have equal mean variance (C)Ho:the populations relative frequency distributions are identical (D)Ho:the populations are normally distributed (E)none of the above answer are correct 4.Of the following the one that is not an assumption underlying linear regression analysis is: (A)Y is fixed and X is a random variable (B)the relationship between X and Y is linear 麻煩大大了~~ --

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