A Random Sample of 18 Observations Is Taken from a Normal

question 3

Multiple Choice

A random sample of 18 observations is taken from a normal population. The sample mean and sample standard deviation are 76.4 and 4.2, respectively. What is an 80% interval estimate of the population variance?

• A) [12.107, 29.735]
• B) [10.870, 34.581]
• C) [12.819, 31.484]
• D) [14.636, 23.443]

---

Definitions:

Smooth Muscle

A type of muscle found in the walls of hollow organs (such as intestines and blood vessels), controlled involuntarily and responsible for various automatic body functions.

Alveolar Walls

Thin structures within the lungs where gas exchange occurs between the air in the alveoli and the blood in the capillaries.

Bronchi Inflammation

The swelling and irritation of the bronchi, the major airways to the lungs, often resulting from infection or chronic conditions like asthma.

Fibrous Connective Tissue

A type of connective tissue rich in collagen fibers that provides support and strength to various structures of the body such as tendons and ligaments.