A Statistician Claims That the Standard Deviation of the Weights

question 29

Multiple Choice

A statistician claims that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 randomly chosen firemen had a standard deviation of their weights of 26.2 pounds. Assume the variable is normally distributed. At α = 0.05, what is the critical value χ² for this test?

• A) 31.410
• B) 30.144
• C) 10.851
• D) 10.117

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Definitions:

Flooding

An exposure therapy technique used in psychology to treat phobias and anxiety disorders, or the occurrence of excessive water covering land that is usually dry.

Sterile Dressing

A germ-free covering applied to a wound to protect it from infection and promote healing.

Water

a colorless, tasteless, and odorless liquid essential to life, forming the world's lakes, rivers, seas, and rain, and a major component of the fluids of organisms.

Edema

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