Supply Chain Management Ch.9 MBA 6040

The following process is not centered in the specification range. The process measures are: USL = 260, LSL = 170, μ = 200, σ = 10. Calculate the correct measure of the process capability index.

1.0

Suppose that the upper specification level is equal 220 and the lower specification level is equal 160, process is centered within the specification range, and its standard deviation equals 8. Calculate the process capability index?

1.25

Control charts for variables require much smaller sample sizes than the attribute control charts, usually in the range of ______ items.

3 to 10

A typical Six Sigma projects takes ______.

3 to 6 months

What should be determined after each of the processes that need to be controlled were identified? Select all that apply.

Amount of inspection required Types of measurement or tests Critical control points

If the process being controlled produces 2% defective units, how big should be sample size for attribute control chart?

At least 50

Which control charts require large samples?

Attribute control charts

______ of variation are those that randomly occur when the process is under statistical control.

Common causes

What will be a good indicator of the ability of the process to meet its specifications?

Cp > 1

If we are not sure that the process is centered in the specification range, which of the following measures of process capability is widely used?

Cpk = Min (USL−μ3σ,μ−LSL3σ)

Six Sigma is a systematic method for process improvement that often uses the five steps defined by the acronym ______.

DMAIC

ix Sigma is a systematic method for process improvement that often uses the five steps defined by the acronym ______.

DMAIC

Which program usually is applied to the simple projects and lasts one week or less?

Lean program

Which of the following signals that the process is not in a state of control?

Measurements fall outside of the control limits

Which diagram shows which effects should be eliminated first?

Pareto diagram

Which program is aimed to reduce defects in the production and service?

Six Sigma method

What is another term for assignable causes?

Special causes

Process capability index can be computed as ______.

Specification width / Process width

Which of the following processes should be sampled frequently? Select all that apply.

The cost of production is high The cost of inspection is low High-volume production

How many control charts are developed for variables quality control?

Two

______ measurement utilizes a continuous scale for product and service characteristics.

Variables

The first step used by the Six Sigma method is ______.

define

In attribute control chart a quality characteristic is measured on a ______ scale.

discrete

The appearance of a cause-and-effect diagram suggests a

fishbone

How many steps in designing a quality control system are there?

four

The purpose of the constants used to calculate control limits for the range chart is to make them as a ______.

function of sample size

Each process can be considered as composed of many subprocesses. Each subprocess has its own ______ customers. internal

internal

Common causes can be removed ______ changing the design of the process

only with

One of the useful attribute control charts is the ______.

p chart

The standard deviation for the percentage of defective items is computed as ______.

p(1−p)/n√

The key principle of the process control is that the ______ is present in any production process.

random variability

The process width is computed as ______ standard deviations of the process measurement..

six

SPC stands for ______.

statistical process control

The last critical inspection point is ______.

the finished product or service

Scatter diagram shows ______.

the relationship between a particular cause and effect.

The upper control limit in the quality control chart is set at plus ______ standard deviation(s) from the mean (the center line of the chart).

three

To get lower and upper control limits of the proportion of defectives we have to add and subtract ______ standard deviations.

three

The goal of quality control is ______ transformation processes to produce consistent output.

to stabilize and maintain

True or false: The transformation process can only be either a manufacturing process or a service delivery process.

False

Which of the following quality control tools allow to understand the process and identify possible problem areas?

Flowcharts

The process should be stopped and a search for assignable cause is made if the percentage falls ______.

below the LCL or above UCL

The ability of the process to meet or exceed the technical specifications obtained from customers is called the process

capability

Diagram that is used to show possible causes of the problem is called ______.

cause-and-effect diagram

To get an accurate measure of process capability, the process is required to be ___ in the specification range.

centered

If a process is unable to meet customer specifications ___ improvement can be applied.

continuous

To insure that the process improvement is not lost over time the Six Sigma method uses ______ step as the last step.

control

If the normal probability distribution is assumed then the upper and lower control limits will include ______ of the random variation observed.

99.74%