The Mean Weight of Trucks Traveling on a Particular Section

question 45

Multiple Choice

The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighing station and finds the mean weight is 15.8 tons. The population standard deviation is 3.8 tons. What is the 95 percent interval for the population mean?

• A) 14.7 and 16.9
• B) 13.2 and 17.6
• C) 10.0 and 20.0
• D) 16.1 and 18.1

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Definitions:

Hydrogen Sulfide

A colorless, poisonous gas with a characteristic smell of rotten eggs, used in the manufacture of chemicals and in metallurgy.

Sensory Cells

Sensory cells are specialized cells that respond to specific types of sensory stimuli, such as light, sound, or touch, and convert them into electrical signals.

Nasal Cavities

The large air spaces located behind the nose, involved in breathing and the sense of smell, lined with mucous membranes.

Distal Stimulus

An object or event in the outside world.