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Exam 19: Statistical Process Control

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Question 1

True/False

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Some degree of variability is present in almost all processes.

A) True
B) False

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Question 2

Multiple Choice

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The number of late insurance claim payouts per 100 should be measured with what type of control chart?

A) x-bar chart
B) R-chart
C) p-chart
D) c-chart
E) either p-chart or c-chart

F) A) and B)
G) A) and C)

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Question 3

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A retail store manager is trying to improve and control the rate at which cashiers sign customers up for store credit cards.The manager takes several samples of size 50.He finds that each sample of 50 contained 5 credit card signups on average.Find p-bar and 99.73% control limits.

The ________ is the lowest level of quality that we are willing to accept.

The acceptable quality level (AQL)is the average level of quality we are willing to accept.

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

If a process has only natural variations,________ percent of the time the sample averages will fall inside the ±3-sigma control limits.

A woodworker is concerned about the quality of the finished appearance of her work.In sampling units of a split-willow hand-woven basket,she has found the following number of finish defects in ten units sampled: 4,0,3,1,2,0,1,2,0,2. a.Calculate the average number of defects per basket. b.If 3-sigma control limits are used,calculate the lower control limit and upper control limit.

The number of defects after a hotel room cleaning (sheets not straight,smears on mirror,missed debris on carpet,etc. ) should be measured using what type of control chart?

A Type I error occurs when:

A run test is used:

The specification for a plastic liner for concrete highway projects calls for a thickness of 6.0 mm ± 0.1 mm.The standard deviation of the process is estimated to be 0.02 mm.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.03 mm.What is the Cp and Cpk for this process? About what percent of all units of this liner will meet specifications?

A hospital-billing auditor has been inspecting patient bills.While almost all bills contain some errors,the auditor is looking now for large errors (errors in excess of $250).Each day last week,the auditor examined 100 bills and found an average defect rate of 16%.Calculate the upper and lower limits for the billing process for 99.73% confidence.

The normal application of a p-chart is in:

Acceptance sampling's primary purpose is to:

The defect rate for a product has historically been about 1.6%.What are the upper and lower control chart limits for a p-chart,if you wish to use a sample size of 100 and 3-sigma limits?

A bank's manager has videotaped 20 different teller transactions to observe the number of mistakes being made.Ten transactions had no mistakes,five had one mistake and five had two mistakes.Compute proper control limits at the 90% confidence level.

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

The Central Limit Theorem states that when the sample size increases,the distribution of the sample means will approach the normal distribution.

Assignable variation: