The Mann-Whitney U Test is a nonparametric version

The Mann-Whitney U Test is a nonparametric version of the independent samples t-test. The test primarily deals with two independent samples that contain ordinal data. The following example explained the comparison between the nonparametric versus parametric tests.

1. Select the best choice for the analysis and explain the reason.
2. Review Module 4, if needed.
3. Remember the importance of the p-value. 

Results S.S. Bayesian Independent Samples T-Test

Descriptive Statistics

Independent Samples T-Test

Independent Samples T-Test

Test

Statistic

df

p

WBC

Student

0.318

137

0.751

Mann-Whitney

2339.000

0.750

Assumption Checks

Test of Normality (Shapiro-Wilk)

W

p

WBC

0

0.394

< .001

1

0.800

< .001

Note.  Significant results suggest a deviation from normality.

Descriptives

Group Descriptives

Group

N

Mean

SD

SE

WBC

0

70

8.539

9.384

1.122

1

69

8.142

4.405

0.530

Hint: Visual determination.

Submission Instructions:

• Submit your assignment by 11:59 pm ET on Sunday.
• It should include at least 3 academic sources, formatted and cited in APA.