## Foundations of Operations Management Study Set 2

Statistics

## Quiz 6 :

Inventory Management

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Q01 Q01 Q01

Historically, the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day. Management would like to specify the control limits for an X- chart with a sample size of 10 and 3 sigma limits. The UCL for the chart would be

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Q09 Q09 Q09

A hotel tracks the number of complaints per month. When the process is in control, there is an average of 35 complaints per month. Assume that a 2- sigma control limit is used. The next four months have 33, 27, 29, and 43 complaints. What should management do?

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Q23 Q23 Q23

A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.0015 inch. Currently, the first three items from each batch of 20 are inspected. Use Table 1.. What is the value of LCLX if the sample size is increased to 6?

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Q31 Q31 Q31

Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm. Determine the central line and upper and lower control limits for an X- and an R- chart, assuming samples of size 8 will be taken. Use Table 7.1.For the - chart, what is the value of UCL

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Q35 Q35 Q35

Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm. Determine the central line and upper and lower control limits for an X- and an R- chart, assuming samples of size 8 will be taken. Use Table 7.1. For the R- chart, what is the value of the UCL

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Q37 Q37 Q37

A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.0015 inch. Currently, the first three items from each batch of 20 are inspected. Use Table 1.. The quality control manager has recommended inspecting the first 3 and the last 3 items. (a sample of 6) from each batch of 20. What is the value of the UCLX ?

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Q44 Q44 Q44

Assume that the newly implemented control chart has a central line of p = 0.10, with the standard deviation computed from this original value. Assume also that z = 2 is used for defining the control limits and sample sizes of 100 dolls. What can be said about the doll- making process based on the first five weeks of experience from Table 7.4?

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Q50 Q50 Q50

Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm. Determine the central line and upper and lower control limits for an X- and an R- chart, assuming samples of size 8 will be taken. Use Table 7.1. For the R- chart, what is the value of the LCL

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Q71 Q71 Q71

Samples of 100 checks each were taken at a bank from an encoding machine (which records the amount of a check) over a five- day period. Details are summarized in the Table 7.3. If the bank were to use the average proportion defective from these five samples as the central line for a process control chart, what would be the central line?

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Q75 Q75 Q75

Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm. Determine the central line and upper and lower control limits for an X- and an R- chart, assuming samples of size 8 will be taken. Use Table 7.1.For the X- chart, what is the value of the LCL

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Q80 Q80 Q80

Historically, the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day. Management would like to specify the control limits for an X- chart with a sample size of 10 and 3 sigma limits. The LCL for the chart would be

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Q95 Q95 Q95

Historically, the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day. Management would like to specify the control limits for an X- chart with a sample size of 10 and 3 sigma limits. Suppose the next sample of 10 yielded the following result: 3.2, 2.1, 3.6, 2.8, 3.9, 3.5, 2.7, 4.1, 2.6, and 3.3. What conclusion can be drawn?

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Q103 Q103 Q103

An operator of a filling machine plotted the weights of each bag she filled for three weeks. At the same time, a quality inspector randomly took groups of five bags of the same output and plotted the average weights of the samples. The inspector's sampling distribution will

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