An Economist Is Interested in Studying the Incomes of Consumers

question 41

Multiple Choice

An economist is interested in studying the incomes of consumers in a particular country. The population standard deviation is known to be $1,000. A random sample of 50 individuals resulted in a mean income of $15,000. What is the upper end point in a 99% confidence interval for the average income?

• A) $15,052
• B) $15,141
• C) $15,330
• D) $15,364

---

Definitions:

Modifier Private

A keyword in Java that restricts access to a member of a class (variables, methods) such that it can only be accessed within its own class.

Instance Variable

For each object instantiated from a class, this variable ensures they each have a unique copy, by being defined within the class.

Class Definition

The specification of how a class is structured, including its fields, methods, and constructors in object-oriented programming.

Method Invocation

The process of calling a method on an object, which executes the code defined in the method body.