A Sample of Recorded Dog Barks Is Analyzed for Decibel

question 12

Multiple Choice

A sample of recorded dog barks is analyzed for decibel intensity.The mean intensity is 62.25 decibels, with a variance of 4.45.If this data set is normally distributed, we would expect approximately 95% of the barks to be within what range?

• A) (58.03, 66.47)
• B) (60.16, 64.36)
• C) (55.92, 66.47)
• D) (53.35, 71.15)

---

Definitions:

Consumer Demand

The desire and willingness of consumers to purchase a certain quantity of goods or services at various price points, at a particular time.

Competitive Increasing-cost Industry

An industry where supply costs increase as output expands, often because resources become scarcer or harder to obtain as production grows.

Long-run Equilibrium

A state in which all firms in a perfectly competitive market earn zero economic profits, with no incentives for new firms to enter or existing firms to exit.

Decrease in Demand

A situation where consumers' willingness and ability to purchase a product at all price levels declines, represented by a leftward shift of the demand curve.