In a Recent Investigation,the National Highway Traffic Safety Administration (NHTSA)found

question 68

Essay

In a recent investigation,the National Highway Traffic Safety Administration (NHTSA)found that the Chevrolet Volt and other electric vehicles do not pose a greater risk of fire than gasoline-powered vehicles (The Boston Globe,January 25,2012).Specifically,it was determined that "no discernible defect trend exists." Suppose a consumer advocacy group wants to verify some of these claims by constructing a chart.The group expects 2% of electric cars to catch fire each month.For each of the last six months,500 electric car owners are asked if their cars have caught fire.The following sample proportions are obtained:
0.010 0.020 0.015 0.030 0.025 0.015
A)Assuming that the group expectation is correct,construct the centerline and the upper and lower control limits for the chart.
B)Do the consumer group's findings support those of the NHTSA? Explain.

• A)Assuming that the group expectation is correct,construct the centerline and the upper and lower control limits for the chart.
• B)Do the consumer group's findings support those of the NHTSA? Explain.

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Definitions:

Government Control

The extent to which a government exerts authority over various aspects of society, including the economy, personal freedoms, and the media.

Do Not Call Registry

A database managed by a government or independent body where individuals can add their telephone numbers to reduce telemarketing calls.

Solicited Telemarketing Calls

Telephone calls made to individuals who have previously expressed interest or consent to be contacted for promotional reasons.

Telephone Consumer Protection Act

A U.S. law established to protect consumers from unwanted telemarketing calls, faxes, and SMS text messages through regulatory guidelines.