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pepeeman pepeeman
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Posts: 312
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6 years ago
A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 5 and 7 . The alternative hypothesis is stated as: The location of population 1 is different from the location of population 2 . The appropriate critical value at the 5 significance level is:
 a. 21
  b. 29
  c. 33
  d. 35
  e. 38

Q. 2

To apply the Wilcoxon rank sum test to determine whether the location of population 1 is different from the location of population 2, the samples must be:
 a. drawn from normal populations
  b. drawn from matched pairs experiment
  c. independent
  d. larger than 30
  e. larger than 50

Q. 3

You are performing the Wilcoxon rank-sum test. The 14th through 16th values in an ordered array of pooled sample data all equal 160 (while the 13th value is less and the 17th value is more). The appropriate ranks for the three 160 values are:
 a. 14, 15, 16
  b. 15, 15, 15
  c. 13.5, 14, 15.5
  d. 14.5, 15, 16.5
  e. 14, 14, 14

Q. 4

When assigning ranks during a Wilcoxon rank-sum test, tied values are each given the mean of the next ranks to be assigned. Which of the following statements about this averaging procedure is false?
 a. The procedure is crucial when the tied values belong to the same sample.
  b. Although still employed, the procedure is not crucial (and an arbitrary assignment of ranks to tied values would be acceptable) when the tied values belong to the same sample.
  c. The procedure is designed to avoid arbitrariness. In the absence of this procedure, depending on whether one rank (say, 4) was assigned to sample 1 figure and the next rank (say, 5) to sample 2 or whether rank 5 went to sample figure and 4 to sample 2, we would produce a different sum of ranks for the two samples.
  d. Although still employed, the procedure is not crucial (and an arbitrary assignment of ranks to tied values would be acceptable) when the tied values belong to the same sample and the procedure is designed to avoid arbitrariness. In the absence of this procedure, depending on whether one rank (say, 4) was assigned to sample 1 figure and the next rank (say, 5) to sample 2 or whether rank 5 went to sample figure and 4 to sample 2, we would produce a different sum of ranks for the two samples.
  e. They are all false.

Q. 5

Comparing the output of strawberries grown on plots using fertilizer A with that grown on otherwise identical plots using fertilizer B, in order to make a general assessment of relative fertilizer effectiveness, may well call for:
 a. a Friedman-Smirnov test
  b. a Kruskal-Wallis test
  c. a Wilcoxon rank-sum test
  d. a Spearman rank correlation test
  e. a chi-square test

Q. 6

Which of the following correctly describes the Wilcoxon rank-sum test?
 a. It is a nonparametric test based on two independent simple random samples.
  b. It is designed to determine whether the relative frequency distributions of two statistical populations of continuous values are identical to or different from one another.
  c. The Wilcoxon rank-sum test is equivalent to a parametric t-test of the difference between two independent means.
  d. All of these.
  e. None of these

Q. 7

Which of the following statements about nonparametric tests is false?
 a. We can safely employ nonparametric tests even when we know nothing at all about the populations from which sample data are being drawn.
  b. We can conduct nonparametric tests with nominal data.
  c. We can conduct nonparametric tests with ordinal data.
  d. We can only conduct nonparametric tests with data of a higher order than nominal or ordinal.
  e. None of these.

Q. 8

Consider the following data set: 14, 14, 15, 16, 18, 19, 19, 20, 21, 22, 23, 25, 25, 25, 25, and 28 . The rank assigned to the four observations of value 25 is:
 a. 12
  b. 12.5
  c. 13
  d. 13.5
  e. 14
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ZeoeZeoe
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Posts: 332
Rep: 4 0
6 years ago
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pepeeman Author
wrote...
6 years ago
Thank you soooo very much, it was really helpful and kind of you to answer my q's
wrote...
6 years ago
You're welcome, once again
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