Find the 95% Confidence Interval for the Variance of the Heights

question 83

Multiple Choice

Find the 95% confidence interval for the variance of the heights of maple trees if a sample of 11 trees has a standard deviation of 10.2 feet.

• A) \(93.0 < \sigma ^ { 2 } < 115.0\)
• B) \(7.1 < \sigma ^ { 2 } < 17.9\)
• C) \(9.2 < \sigma ^ { 2 } < 11.2\)
• D) \(50.8 < \sigma ^ { 2 } < 320.4\)

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Definitions:

Brown-black Pigment

Melanin, the natural substance in the body that gives color to the skin, hair, and eyes, and offers protection against UV radiation.

Subcutaneous

Concerning anything that is situated below the skin layer.

Dermis

The thick layer of tissue below the epidermis in mammalian skin, containing blood capillaries, nerve endings, sweat glands, and hair follicles.

Dilate

To enlarge, expand in size; to increase the size of an opening.