A Car Mechanic Is Thinking of Guaranteeing Customers That an Oil

question 139

Essay

A car mechanic is thinking of guaranteeing customers that an oil change will take no more than 15 minutes with a 99.73% confidence level.He takes a few samples of size 5 and finds the process mean to be 13 minutes with a standard deviation of .2 minutes and average sample range of 1.2 minutes.Find the , ,and values and use them to compute the upper and lower limits for an x-bar chart.Use the upper limit to determine if the mechanic can offer a 15 minute guarantee.Assume the mechanic plots the samples on the x-bar control chart and finds the process is in control,is there anything else the mechanic is missing to ensure the process is in control?

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Definitions:

Soft-money Contributions

Unregulated, indirect contributions made to political parties for general support purposes, not directly tied to the endorsement of specific candidates, which became more restricted in U.S. politics by the Bipartisan Campaign Reform Act of 2002.

Federal Elections Commission

A federal agency created to regulate the financing of political campaigns in the United States.

Federal Courts

Courts of law under the national government of the United States, responsible for interpreting federal laws, including the Constitution, and adjudicating disputes.

Soft Money

Political funding directed to a party or organization for general political activities, not directly tied to the support of specific candidates, and less regulated by law.