Stage 2 Sleep Is Characterized by the Presence of _____

question 20

Multiple Choice

Stage 2 sleep is characterized by the presence of _____, and Stage 4 sleep is characterized by the presence of _____.

• A) sleep spindles; delta waves
• B) delta waves; sleep spindles
• C) sleep spindles; alpha waves
• D) alpha waves; sleep spindles

---

Definitions:

Expected Count

The predicted number of occurrences in a category for a statistical experiment based on probability theories.

Null Hypothesis

An alternative definition: The presumption used in statistical testing that indicates no significant difference or effect in a given experiment or observation.

Proposed Change

A suggestion put forward for consideration by others to make alterations or modifications to an existing situation or document.

Alternative Hypothesis

In statistical hypothesis testing, a statement that contradicts the null hypothesis and indicates a new theory or finding is expected.