Distribution Plot Exercise 1

A reliability engineer wants to assess the reliability of a new type of automobile muffler. The engineer collects failure data on both the old type and the new type of mufflers. She wants to identify the failure rates to determine the mileage at which the mufflers fail.

Use the accelerated test data in the file Muffler Reliability. mwx , which shows the failure time (in miles) for each muffler new and old muffler tested.

1. If the failure data is modeled using a Weibull distribution, produce the distribution overview plots.
2. What conclusions can you draw regarding the new and old mufflers? Why?
3. Produce the distribution overview plots assuming no distribution.
4. How do the conclusions regarding the new and old mufflers change? Why?