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Author Question: Discuss how a histogram can be constructed to give mistaken impressions and how this error can be ... (Read 20 times)

magmichele12

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on: Jun 24, 2018
Discuss how a histogram can be constructed to give mistaken impressions and how this error can be corrected.
 
  What will be an ideal response?

Question 2

Which of the following refers to a nonparametric method to compare two populations, when the samples are independent and the data are either ordinal or interval, and where the normality requirement necessary to perform the parametric test is not
 
  satisfied?A) Sign test
  B) Wilcoxon signed rank test
  C) Equal-variance t-test of 1 - 2
  D) Wilcoxon rank sum test or Mann-Whitney test


leahm14

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Reply #1 on: Jun 24, 2018
Answer to Question 1

One possible error in constructing a histogram is to make the heights of the rectangles, and not the area of the rectangles, proportional to the frequencies. This frequently occurs when the widths of the intervals are not equal.
To remedy this, one must adjust the areas to be proportional to the frequencies. For example, if the intervals have widths of 10 and then jumps to a width of 20, the height of the frequencies for the greater width interval should be halved.

Answer to Question 2

D


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