If you have continuous data is is always appropriate to use either an I or an x-
ID: 3172296 • Letter: I
Question
If you have continuous data is is always appropriate to use either an I or an x-bar Chart A) True B) False Given a situation where you have continuous data and a subgroup size of 3 you would like to use an x-bar R chart. Before you do that you should A) Nothing, this is the correct chart to use B) Verify that the data are normally distributed C) Verify that the mean of the data is within the specification limits D) Verify that the majority of the data is within the specification limits In a process that produces power transistors one of the things that is measured at the end of the line is that the transistors can survive a 200v potential. The device either passes this test or it does not. An appropriate type of control chart to consider is a A) X-bar - S B) I-MR C) C D) Np|Explanation / Answer
Solution :-
1) True,
Continuous data usually involve measurements, and often include fractions or decimals. Weight, height, width, time, and similar measurements are all continuous data. If you're looking at measurement data for individuals, you would use an I-MR chart. If your data are being collected in subgroups, you would use an Xbar-R chart if the subgroups have a size of 8 or less, or an Xbar-S chart if the subgroup size is larger than 8.
2) (C), verify that the mean of the data is within the specification limits.
The Xbar chart is used to evaluate consistency of process averages by plotting the average of each subgroup. It is efficient at detecting relatively large shifts in the process average.
The R chart, on the other hand, plot the ranges of each subgroup. The R chart is used to evaluate the consistency of process variation.
3). D, np chart
If you have yes/no data, you will use either a p or np control chart to examine the variation in the fraction of items not meeting a preset specification in a group of items. You would use a p control chart if the subgroup size (the number of items examined in a given time period) changes over time. You would use the np control chart if the subgroup size stays the same.
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