If 20 samples of size 7 are drawn,with $\overline { \overline X }$

= 33.33 and $\bar { R }$
= 5)65,what is the A-B upper boundary for the $\bar { X }$
Chart?
A)35.697
B)34.908
C)34.347
D)34.008

Question

If 20 samples of size 7 are drawn,with $\overline { \overline X }$

= 33.33 and $\bar { R }$
= 5)65,what is the A-B upper boundary for the $\bar { X }$
Chart?
A)35.697
B)34.908
C)34.347
D)34.008

Quizplus · Accepted Answer

The A-B upper boundary for the $\bar{X}$ chart is calculated using the formula: $\overline{\overline{X}} + A_2 \times \bar{R}$. For a sample size of 7, $A_2$ is approximately 0.419. Therefore, the calculation is $33.33 + 0.419 \times 5.65 = 34.908$.

If 20 Samples of Size 7 Are Drawn,with X‾‾\overline { \overline X }X

If 20 Samples of Size 7 Are Drawn,with $\overline { \overline X }$