A Company in Maryland Has Developed a Device That Can

question 20

Multiple Choice

A company in Maryland has developed a device that can be attached to car engines,which it believes will increase the miles per gallon that cars will get.The owners are interested in estimating the difference between mean mpg for cars using the device versus those that are not using the device.The following data represent the mpg for independent random samples of cars from each population.The variances are assumed equal and the populations normally distributed. Given this data,what is the critical value if the owners wish to have a 90 percent confidence interval estimate?

• A)t = 2.015
• B)t = 1.7823
• C)z = 1.645
• D)z = 1.96

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Definitions:

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A type of involuntary, rhythmic muscle contraction characterized by large, fast movements that are visible and can affect any part of the body.

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Symptoms that occur when a person who is accustomed to regular alcohol intake suddenly stops or significantly reduces their alcohol consumption.

CIWA-Ar

A clinical tool used to assess the severity of alcohol withdrawal symptoms and guide treatment decisions.

Screening Tool

An instrument or method used to detect the presence of disease, risk factors, or conditions in individuals who may not yet show symptoms.