A Researcher Wants to Determine Whether the Means of Two

question 79

Multiple Choice

A researcher wants to determine whether the means of two independent populations are the same.She has two independent random samples,one from each population,shown in the following table: She uses the Mann-Whitney U test and a significance level of 0.05.This is a ______ test,and the critical ______.

• A) one-tailed; value is 1.96
• B) two-tailed; values are ±1.96
• C) one-tailed; value is 1.645
• D) two-tailed; values are ±1.645
• E) one-tailed; value is −1.96

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Definitions:

Modeling

The process of constructing and using physical, mathematical, or conceptual representations of real-world phenomena for the purpose of study or prediction.

Feedback

A process in which information about past or ongoing performance influences future efforts or behavior.

Rehearsal

The process of practicing or going over content or actions repeatedly to improve performance or memorization.

Obsessive-compulsive Disorder

A common, chronic, and long-lasting disorder in which a person has uncontrollable, reoccurring thoughts (obsessions) and behaviors (compulsions) that they feel the urge to repeat over and over.