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 mean chart, what is the value for R bar used to compute the limits?
A) 411.4
B) 614
C) 16.46
D) 102.88

Question

Quizplus · Accepted Answer

To construct a mean chart, we need to calculate the average of the sample ranges, which is represented by R bar. Therefore, R bar = R/number of samples = 411.4/25 = 16.46. Hence, the correct choice is C.

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

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