A Researcher Wants to Determine What Percentage of the Population

question 113

Multiple Choice

A researcher wants to determine what percentage of the population in the southeastern United States would use a mass transit system if it were well-maintained.He gets telephone books from every city with over 200,000 people in those states and selects the fifteenth name in the middle column on every hundredth page as his sample.He has made a _____ error.

• A) targeting
• B) random
• C) nonprobability
• D) frame
• E) reliability

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Definitions:

Dummy Variable

A binary variable used in statistical models to represent the presence or absence of a characteristic or effect.

Significance Level

The probability of rejecting the null hypothesis in a statistical test when it is actually true, serving as a critical value for decision-making in hypothesis testing.

Coefficient

A numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g., in math or statistics).

Dummy Variables

Numerical variables used in statistical modeling to represent subgroups of the sample in regression analyses.