9. When a control chart signals out of control, an Ishikawa (Fish-Bone, Cause-an
ID: 3321166 • Letter: 9
Question
9. When a control chart signals out of control, an Ishikawa (Fish-Bone, Cause-and-Effect) diagram and/or a flow chart can be consulted to identify and fix the problem (assignable cause). This statement is A. True B. False 10. From a production line, a quality engineer periodically takes a random sample of n = 4 solar energy collectors and measures the energy output (in watts) of each unit. Which of the following control charts is/are NOT appropriate for monitoring the energy output? Assume that no other information is available A. c and u charts B. X and R charts C. np andp charts D. Both (A) and (C). 11. A process that produces mirrors for cars is monitored by taking a random sample of n = 20 mirrors and counting the total number of visual flaws on all the mirrors. Let c be the total number of flaws on the mirrors in the ith sample. Suppose that over the last m = 70 periods, the overall total number of flaws found is 2 c820. What are the lower and upper contral limits for a u chart? ± 3J(2002 = 0.0723, 1.0991 820 20x70 20 820 20 820 2 -±3(ta01 70) = 0.3 1 1 3, 0.8601 ±3.=1.45. 21.98 C. 20x70V 70 D. 70Explanation / Answer
The answer for following questions are as follows :
9) True
10) Both A and C
11) Option B
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