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Exam 23 Managing Quality

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Question 71

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The mean and standard deviations for a process are μ= 90 and σ = 9. For the variable control chart, a sample size of 16 will be used. Calculate the standard deviation of the sampling distribution.

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Sigma x-ba...

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Question 72

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A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that when the process is operating as intended, packaging weight is normally distributed with a mean of twenty ounces, and a process standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each. The data from that activity appears below. (a) If he sets an upper control limit of 21 and a lower control limit of 19 around the target value of twenty ounces, what is the probability of concluding that this process is out of control when it is actually in control? (b) With the UCL and LCL of part a, what do you conclude about this process-is it in control?

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(a) These control limits are one standar...

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Question 73

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Why are x-bar and R-charts usually used hand in hand?

At your first job out of college you have been assigned to the production of bottled 20 oz. soda. The process has upper and lower limits of 20.5 and 19.5 oz, respectively, with a mean of 19.8 oz and standard deviation of .3 oz. Your manager has requested the process produce no more than 3.4 defects per 1 million bottles produced. Calculate C_pk and then determine if the process is capable or if you should be looking for assignable variation.

In acceptance sampling, a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

If a process has only natural variations, __________ percent of the time the sample averages will fall inside the (or ) control limits.

The purpose of an x-bar chart is to determine whether there has been a

The __________ are calculated to show how much allowance should be made for natural variation.

The usual purpose of an R-chart is to signal whether there has been a

What is the difference between the process capability ratio C_p and the process capability index C_pk?

Acceptance sampling is usually used to control

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm. The standard deviation of the process is estimated to be 0.004 mm. What are the upper and lower specification limits for this product? The process is currently operating at a mean thickness of 2.50 mm. (a) What is the Cp for this process? (b) About what percent of all units of this liner will meet specifications? Does this meet the technical definition of Six Sigma?

In statistical process control, the range often substitutes for the standard deviation.

Assignable variation

The term __________ is used to describe how well a process makes units within design specifications (or tolerances).

A nationwide parcel delivery service keeps track of the number of late deliveries (more than 30 minutes past the time promised to clients) per day. They plan on using a control chart to plot their results. Which type of control chart(s) would you recommend?

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, centerline, and upper control limit.

According to the text, the most common choice of limits for control charts is usually

Acceptance sampling

Control charts for variables are based on data that come from