The director of vehicle maintenance for a large mass transportation authority wants to know theaverage life of bus tires for the fleet of 1,800 busses. A random sample of 100 tires is studied andthe mean life is 20,000 miles, with a standard deviation of 1,200 miles. Construct and interpret a95 percent confidence interval for the true life of tires2.

Question
Asked Apr 24, 2019
The director of vehicle maintenance for a large mass transportation authority wants to know the
average life of bus tires for the fleet of 1,800 busses. A random sample of 100 tires is studied and
the mean life is 20,000 miles, with a standard deviation of 1,200 miles. Construct and interpret a
95 percent confidence interval for the true life of tires
2.
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The director of vehicle maintenance for a large mass transportation authority wants to know the average life of bus tires for the fleet of 1,800 busses. A random sample of 100 tires is studied and the mean life is 20,000 miles, with a standard deviation of 1,200 miles. Construct and interpret a 95 percent confidence interval for the true life of tires 2.

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Expert Answer

Step 1

In this question, we have a sample of 100 tires and mean life of tire is 20,000 miles and standard deviation 1200 miles. We have to construct 95% confidence interval.

Step 2

Here we have calculated that the confidence interval, calculations have shown on whiteboard. 

The required...

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