A Marketing Firm Wants to Estimate How Much Root Beer

question 58

Multiple Choice

A marketing firm wants to estimate how much root beer the average teenager drinks per year. A previous study found a standard deviation of 1.12 liters. How many teenagers must the firm interview in order to have a margin of error of at most 0.1 liter when constructing a 99% confidence interval?

• A) 831.39
• B) 832
• C) 832.39
• D) 833

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Definitions:

Substitute

A product or service that can replace another, offering consumers an alternative choice.

Imperfect Competition

Imperfect competition describes a market structure where the conditions necessary for perfect competition are not met, including markets with monopolies, oligopolies, and monopolistic competition.

Marginal Productivity Theory

An economic principle that explains how the amount of extra output gained by employing an additional unit of input declines as more of that input is used.

Monopoly and Monopsony

A monopoly refers to a market with a single seller facing many buyers, whereas a monopsony is a market with a single buyer facing many sellers.