Test review Six Sigma 11

Over 200,000 customer transactions are processed. Two hundred defects are reported. What is the DPMO.

1000

An S-Chart is used for continuous data and whenever the sample size is greater than:

12 below than 25

The following sample data tells us how long it took for a manufacturer of cell phones to repair five defective phones still on warranty. The range for this data is __________ days. 22,34,17,16,27

16 to 34

The following is a regression equation. Y= 10 + 35 X. If X is 5 the value of Y is ____________ .

185

Which of the following represents the number of Defects Per Million Outcomes associated when a process has been designed to meet Six-Sigma standards.

3.4

A company using Six Sigma is operating at a 99.99967 defect-free rate. What is the Sigma Level and DPMO.

6 sigma

Establishing a ______________ is necessary when creating process control charts

All of the above

A ___________ error occurs when the process mean is stable and in-control but an output result has occurred above the UCL or below the LCL. So, in this situation a false out-of-control signal has occurred.

Alpha

When the difference between the means of more than two samples must be tested, and the assumption of normality is met, which of the following is most appropriate?

Anova

The Taguchi Loss Function suggests that _______________ .

As the mean output of a process varies farther and farther away from its target, the losses to a company grows larger and larger.

DPMO is an acronym for which of the following?

Defects Per Million Opportunities

Drawing a process flow diagram is usually associated with the ____________ phase of the lean-six sigma process.

Define

A P-Chart is used to monitor ____________ data

Discrete

Which of the following tools is used to anticipate how a process might fail to meet output expectations.

Failure Mode and Effects Analysis

Lower and Upper Specification Limits must be contained within Lower and Upper Control Levels.

False

Minimizing waste is not one of the objectives of a Six Sigma Analysis.

False

The average time it takes to repair headphones at a factory repair center is 90 hours with a standard deviation of 10 hours. To monitor this process daily, samples of 15 headphones are taken and the mean time computed. Today, the mean time was 84.5 hours. Suppose a similar sample of 15 headphones was undertaken shortly after the first sample was taken. The mean of both samples would be expected to be the same if the process is in-control.

False

When designing a test of hypothesis a one-tailed test must always be used when sample sizes are small.

False

The methodology of Lean Six-Sigma moves though five steps. Which of the following is not one of them?

Install

An X-bar chart monitors _________________ .

Monitors the process mean by periodically taking sample means, where each sample mean is plotted on the chart. When a sample mean falls beyond the LCL or UCL, the process is said to be out-of-control.

Which of the following two statistics is used to describe a normal distribution?

Mean, Standard Deviation

Which of the following represents the statistic that is plotted on an S-Chart?

Non of the above

A Two Sample t Test assumes that the distribution from which samples will be drawn is _______________ .

Normally distributed

A process that is considered to be ______________ is one where: sample outcomes over time are distributed around a target value or centerline; the variation of process output is randomly distributed about this target; and the sample outcomes are within the lower and upper control limits.

Optimized

An insurance company monitors customer complaints. There are several possible problem categories including wrong bill sent, charges too high, failure to add new coverage, deletion of existing coverage and incorrect address. Which of the following can be used to determine the percentage that each problem contributes to customer complaints.

Pareto diagram

In an R-Chart, the range is used as an estimate of the standard deviation.

R charts are used to monitor the variation of a process based on samples taken from the process at given times (hours, shifts, days, weeks, months, etc.). MAYBE

Which of the following is used to identify and display inputs, suppliers, outputs, process and customers?

Sipoc

Which of the following is not considered a hypothesis test?

Standard error

When Special Cause variation is suspected, which of the following steps should be taken?

Stop the process, identify the Special Cause and eliminate it.

The center line in a statistical quality control chart represents the ____________ .

Target

A process output target or centerline is positioned below the __________ on a control chart.

Upper Control Limit

The null hypothesis tests for what it is we would like to prove.

The statement that is being tested against the null hypothesis is the alternative hypothesis.

A Fishbone diagram breaks a problem down into possible sources that have contributed to the problem.

True

An ANOVA test determines if there is a significant difference across the means of more than two samples, but it does not tell you if one mean is more significant than the other.

True

If the critical value of p is p= 0.05 and the calculated value of p is p=0.005, the null hypothesis should be rejected.

True

Nonparametric tests such as the One Sample Sign Test are used when the assumption of normality cannot be assured.

True

Regardless of the product or process, it is advisable to set a six-sigma limit to ensure acceptable product or service quality.

True

The Distribution of Sample Means expresses the way in which sample means taken from a population and of a given sample size are distributed around the population mean.

True

The advantage of designing a process with six sigma limits is that no defects will be produced by the process unless the process goes out-of-control.

True

The intercept in a simple linear regression model represents the point at which the regression line crosses the X axis.

True

To monitor variation in a process, a sample is taken, the range calculated, and the range plotted on a quality control chart. As long as the sample result falls within the UCL and LCL, the variation associated with this process would be considered in-control.

True

Which of the following terms represents the characteristics or specifications of the product or service necessary to meet the needs and wants of the customer.

VOC

Which of the following is one of the challenges addressed by Lean?

Waste Delays Errors Rejects

Which of the following is true about the root cause of a problem?

When removed it is very likely to eliminate the problem.

A call center has received many emails form customers who complain that they have to wait too long before reaching a representative. The company has taken steps to improve the process and would like to establish a process control system so that they could monitor the length of time it takes to reach a representative. They plan to take two samples each day. Each sample will include 10 calls. Which of the following charts would be appropriate?

X-Bar and R-Chart

Which of the following defines the relationship between process inputs and outputs?

Y = f(x)

A Risk Priority Number, RPN, is used to determine the ____________________ .

consequences or significance of a failure

The Cost of Poor Quality, also referred to by the acronym COPQ, refers to the ___________________.

costs that would disappear if the process delivered perfect products and services

The acronym VOC refers to the voice of the ___________

customer

The term Value-Added in Lean refers to ____________________.

delivering value for a product or service from the customer's perspective

The purpose of Poka-Yoke is to ______________ .

eliminate the possibility that an error will occur

A Value Stream Map, also called a Process Flow Chart, is used in Six Sigma to analyze the variability of a process.

false

If designed properly, no more than a single histogram would be needed to find the root cause of a problem.

false

In most processes it is possible to eliminate all variation as long as the process has been designed using best practices.

false

Process Maps display a more detailed view of a process than do Value Stream Maps.

false

Special Cause variation is always present to some degree in any process.

false

An Ishikawa Diagram is also known as a _________________

fishbone diagram

An online retailer monitors customer complaints through social media. There are seventeen categories associated with these complaints and include such categories as poor quality, not as described on-line, price too high and slow delivery. When creating a chart to determine which of these categories represents the most frequent problem, it will be necessary to draw a ____________________.

histogram with the tallest bar on the left

One of the objectives of Lean is to minimize or eliminate _________________ .

non-value added activities

Which of the following is necessary to create an R-Chart?

standards deviation

The Root Cause refers to the process of drilling down through data to find the fundamental or most basic cause of a problem.

true

The concept behind the use of a control chart to monitor a process mean is that sample means taken from the process vary around the process mean. If the sample mean varies too far from the process mean, the process mean may have shifted and is in need of adjustment. In other words, the process may no longer be in-control

true