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Manufacturing - Measurement Systems Analysis
A manufacturer of fuel injector nozzles has installed a new digital measuring system and wants to know how well it works. The investigator uses a crossed gage R&R study to assess both the measuring system and the consistency of those who operate it.
Service Quality - t-Test
To promote higher productivity and greater customer satisfaction, a financial services institution wants to establish a baseline for their loan process. They use a 1-sample t-test to estimate the range of likely values for the average processing time and to determine whether their average time differs from a competitor’s claim of 6 hours. They use a normality test to determine whether the data are normally distributed and a time series plot to looks for trends in the data.