Z-MR (Standardized Individual Moving Range) is a control chart that is used to monitor the stability of process where relatively few parts are made in each batch (typically known as a short run process). The Z-MR chart plots the standardized individual observations (z) and moving ranges so that one can evaluate data from different batches on a single control chart. Generally it standardizes the data by subtracting the average from the data point and dividing the result by the standard deviation.
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by Khalandar S on 21st May 2023.
Applause for all the respondents - Khalandar S, Arvind Swarup, Ramjanam Singh, Sanjay Bhure, Raghavendra Rao Althar.
Q 566. Domino's promises delivery of pizza within 20 minutes. It is tracking the delivery time of each order to check the stability of the process. Each order is different with respect to items ordered, delivery location etc. The team has suggested to use either the Individual Moving Range (I-MR) or Z-MR (Standardized Individual Moving Range) control chart. Which control chart is more suitable here given that each order is different from the previous one? Why do you think it is more suitable?
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