What Is the Null Hypothesis for a Mann-Whitney U Test

question 16

Multiple Choice

What is the null hypothesis for a Mann-Whitney U test?

• A) The number of scores above and below the median are equal.
• B) The ranks in two groups are equally dispersed.
• C) The mean differences between two groups are equal.
• D) The ranks in two groups are equal to 0.

---

Definitions:

Element

A pure chemical substance consisting of one type of atom distinguished by its atomic number.

Nucleus

The central and most important part of an atom, containing protons and neutrons and almost all of its mass.

Matter

Anything that occupies space and has mass, composed of atoms or molecules and is the substance that makes up the physical universe.

States

Different forms in which matter can exist, typically observed as solid, liquid, gas, and plasma.