Xbar-R控制图的分析，热心人请解惑
下面是我刚在网上看到的题目与解答，不太理解为什么答案是2），我觉得2，3，4都是对的，即这三种顺序都不对，请帮忙看看，不知是我对英语题意理解错误还是怎么回事。
Arrange the applicable statements in order as one has to do to analyze X-bar R chart.
i) Obtain the customer specification limits for calculating control limits.
ii) Look at Range charts, if it is out of control, X-bar chart has no value.
iii) Review X-bar chart with respect to control limits and carry out Run tests.
iv) Calculate DPMO, after locating points beyond specification limits from X-bar R chart.
1 i), ii), iii), iv)
2 ii), iii); i) and iv) are not applicable.
3 ii), iii), iv); i) is not applicable.
4 i), ii), iii); iv) is not applicable.
Explanation:
Always analyze the Range chart first. The control limits of X-bar chart is taken from the average Range, so if the Range chart is out of control, then the control limits of X-bar is of no value. Never compare the points of X-bar chart control limits with respect to specification limits.
Arrange the applicable statements in order as one has to do to analyze X-bar R chart.
i) Obtain the customer specification limits for calculating control limits.
ii) Look at Range charts, if it is out of control, X-bar chart has no value.
iii) Review X-bar chart with respect to control limits and carry out Run tests.
iv) Calculate DPMO, after locating points beyond specification limits from X-bar R chart.
1 i), ii), iii), iv)
2 ii), iii); i) and iv) are not applicable.
3 ii), iii), iv); i) is not applicable.
4 i), ii), iii); iv) is not applicable.
Explanation:
Always analyze the Range chart first. The control limits of X-bar chart is taken from the average Range, so if the Range chart is out of control, then the control limits of X-bar is of no value. Never compare the points of X-bar chart control limits with respect to specification limits.
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gongyong1981112 (威望:2) (湖北 荆州)
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