A Random Sample of N Measurements Was Selected from a Population

question 63

Multiple Choice

A random sample of n measurements was selected from a population with unknown mean µ and known standard deviation ?. Calculate a 95% confidence interval for µ for the given situation.
Round to the nearest hundredth when necessary.

$\mathrm { n } = 100 , \overline { \mathrm { x } } = 74 , \sigma = 25$

• A) \(74 \pm 0.49\)
• B) \(74 \pm 4.11\)
• C) \(74 \pm 4.9\)
• D) \(74 \pm 49\)

---

Definitions:

Congenital Heart Disease

Congenital heart disease includes heart defects present at birth, causing variations in the normal flow of blood through the heart.

Cataracts

A medical condition where the lens of the eye becomes progressively opaque, resulting in blurred vision and potentially leading to blindness if not treated.

Acquired Immunodeficiency Syndrome

A chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV), which damages the immune system.

HIV-Positive

A status indicating that an individual has been infected with the Human Immunodeficiency Virus, which attacks the immune system.