Random samples of 4 items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, $\Sigma$ X = 15,350 and $\Sigma$ R = 411.4
To construct a range chart, what is the lower control limit (LCL) for the range?
A) 602.004
B) 411.400
C) 625.666
D) 0.00

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for the range chart is calculated as $D_3 \times \bar{R}$. For a sample size of 4, $D_3 = 0$, so the LCL is 0.00.

Random Samples of 4 Items Are Selected from a Manufacturing Σ\SigmaΣ

Random Samples of 4 Items Are Selected from a Manufacturing $\Sigma$