TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in 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. She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Table 18-4,suppose the supervisor constructs an chart to see if the process is in-control.Which expression best describes this chart?
A)Decreasing trend
B)In-control
C)Increasing trend
D)Individual outliers

Question

TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in 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.  She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Table 18-4,suppose the supervisor constructs an  chart to see if the process is in-control.Which expression best describes this chart?
A)Decreasing trend 
B)In-control 
C)Increasing trend 
D)Individual outliers

Quizplus · Accepted Answer

The 11eabc51_6a9c_43e6_8797_6327de6be421_TB2970_11 chart is used to monitor the range of the process over time. The chart shows that the range values for each hour are within the control limits, indicating that the process is in-control and the variability is consistent. There is no evidence of a trend or individual outliers.

TABLE 18-4 A Factory Supervisor Is Concerned That the Time It Takes