Rebecca Sims Is the General Manager of a Chain of Auto

question 16

Multiple Choice

Rebecca Sims is the general manager of a chain of auto parts stores. There are 400 stores in the country and they are divided up into seven divisions based upon geography. Each division has a division manager. The firm prides itself on keeping close tabs on customer satisfaction, and Rebecca has decided to take a sample of the 400 to test a new surrogate measure of customer satisfaction; the dollar value of returned merchandise. Each sample store reports daily the dollar value of merchandise returned and an average is calculated for each division. When Rebecca sees the first set of results, she wants to know if the differences between the division means are real or due to sampling error. Rebecca should use which test?

• A) a z test of the difference between two percentages
• B) independent samples t test
• C) paired samples t test
• D) ANOVA
• E) a division differences test

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Definitions:

Dopamine

A neurotransmitter involved in many functions, including motivation, pleasure, cognition, memory, learning, and fine motor control.

Parkinson's Disease

A progressive neurological disorder characterized by motor symptoms such as tremors, stiffness, and slowed movement, caused by the loss of dopamine-producing brain cells.

Behavioral Disorder

A type of disorder that involves a pattern of disruptive behaviors in children or adults that last for at least six months and cause problems in school, at work, or in social situations.

Volley Principle

A theory suggesting that the perception of pitch in sound is determined by the combined frequencies of neural signals.