Xbar-R图中D4的意义是什么？(BB题)
The factor D4 used in X bar and R control chart is: (UCL=D4 Rbar)
A. The distantce between the mean and the upper control limit of a range chart.
B. The number of detects in a second sample.
C. The constant which corrects the bias in estimating the population standard deviation from the average range of randomly drawn samples.
D. The probability that X bar is in control.
I chose C, but the answer is A.
是不是答案错了？能可以帮忙解释一下具体的来源呢？谢谢
A. The distantce between the mean and the upper control limit of a range chart.
B. The number of detects in a second sample.
C. The constant which corrects the bias in estimating the population standard deviation from the average range of randomly drawn samples.
D. The probability that X bar is in control.
I chose C, but the answer is A.
是不是答案错了？能可以帮忙解释一下具体的来源呢？谢谢
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