When Determining the Sample Size,if the Population Standard Deviation,σ Is

question 18

True/False

When determining the sample size,if the population standard deviation,σ is unknown and an estimate is used,the standard deviation should be re-estimated once the sample has been drawn.Next a revised confidence interval should be calculated to determine the precision level actually obtained.

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Definitions:

Immune System

The body's defense mechanism against infections and diseases, comprising organs, tissues, cells, and proteins that work together to protect the body.

Human Immunodeficiency Virus (HIV)

A virus that attacks the human immune system, depleting the body’s ability to fight infection; the infection that causes AIDS.

Infections

The invasion and multiplication of microorganisms such as bacteria, viruses, and fungi that are not normally present within the body, often causing disease or illness.

Incidence

The frequency or rate at which a particular event or condition occurs within a defined population.