seconds) is too erratic and adversely affects expected profits. The supervisor p

Question

seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below. A tantany supervisor a conemed thar the time i taiap wodam to complete an inportant proo nm in Hour zou 18.4 16.9 23.0 21 21.0 24.0 19.3 lo 30 5 6 24 12 14 13 20.0 23.0 10 She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds, respectively 23) 23) Suppose the supervisor constructs an R chart to see if the variability in collection times is D) 24.00 in-control. What is the center line o chart? A) 20.56 C)20.00 24) 24) Suppose the supervisor constructs an R chart to see if the variability in collection times is in-control. What are the lower and upper control limits for this R chart? B) 0, 43.13 C) -2.33, 43.13 D) -2.28, 42.28 A) 0, 42.28 25) 25) The value of the D4 factor in calculating the upper range is 2.326 B) False A) True 26)_ 26) Suppose the supervisor constructs an R chart to see if the variability in collection times is in-control. This R chart is characterized by which of the following? A) Increasing trend C) In-control B) Individual outliers D) Decreasing trend

Explanation / Answer

Here R- bar = 20.4

for n = 5

D3 = 0

D4 = 2.114

Here lower limit LCL = D3Rbar = 0

UCL = 2.114 * 20.4 = 43.13

Option B is correct

Question 26

Here as all the R vvalues are under the control limites so the R chart is In - control.

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