The True Sampling Error Is Usually Not Known Because
A) $\sigma$

question 113

Multiple Choice

The true sampling error is usually not known because

• A) µ is unknown
• B) µ is a random variable
• C) \(\sigma\)2 is unknown
• D) The sample mean cannot be computed

---

Definitions:

WBCs

White Blood Cells; cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

Macrophages

A type of white blood cell part of the immune system, responsible for detecting, engulfing, and destroying pathogens and cellular debris.

Lymphocytes

A type of white blood cell that plays an essential role in the body’s immune response, involved in protecting the body against antigens.

Lymphocytes

White blood cells that play a significant role in the immune system, including T cells and B cells.