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Author Question: The Wilcoxon rank sum test statistic W is approximately normally distributed whenever both sample ... (Read 149 times)

ssal

  • Hero Member
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  • Posts: 572
on: Jun 24, 2018
The Wilcoxon rank sum test statistic W is approximately normally distributed whenever both sample sizes are at least:
 a. 10.
  b. 15.
  c. 20.
  d. 25.
  e. 30.

Question 2

A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 15 and 20 . The un-standardized test statistic (that is the rank sum) is W = 210 . The value of the standardized test statistic (that is, the value of z-approximation test statistic) is:
 a. 14.
  b. 10.5.
  c. 6.
  d. -1.4.
  e. -8.


jharrington11

  • Sr. Member
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  • Posts: 365
Reply #1 on: Jun 24, 2018
Answer to Question 1

A

Answer to Question 2

D


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