Six Sigma Week 4&5

Pareto was an Italian economist famous for the 80/20 rule, which means

80 percent of wealth belongs to 20 percent of the population

What is a stem and leaf display?

A display that shows the shape of the distribution of the data

What should you have at the end of the measure phase?

A measure, A target and A gap

The most important thing teams should consider when deciding what customer data to collect

Are the measures actionable

attribute data

Attribute data is qualitative data that can be counted for recording and analysis. Examples include the presence or absence of a required label, the installation of all required fasteners. Attribute data is not acceptable for production part submissions unless variable data cannot be obtained.

Baseline data plays an important role in project success because it facilitates

Benefit estimation and Project planning

What's the difference between populations and samples?

Populations are a complete collection of things; samples are a subset of a population

What term describes the probability that a product or service will go through all steps of the process without a defect?

Rolled throughput yield

A trend is

Seven points in a row (rule of thumb)

A run chart can reveal

Shifts and Trends

Why should a sample be random?

So that it is representative of the population

What is the minimum recommended sample size for collecting discrete data?

100

Correlation means

Correlation does not mean causation, The pattern of dots is tighter with a strong correlation, A positive correlation can be either good news or bad news.

Customer needs are not the same as their requirements. All of the following are requirements except

Cup of coffee

What is an advantage of Defects per Unit (DPU) over Rolled Throughput Yield (RTY)?

It accounts for multiple defects per unit of production

Why is a sample taken rather than measuring the whole population?

It is more time and cost effective

Which of the following is NOT true of standard deviation?

It is usually used with the mean to describe our data, It is the most important measure of variation in Six Sigma, It is impacted by extreme data

Nominal is best quality characteristic

Target Values can be of several types, but the most common ones are: (1) smaller is better, (2) larger is better, and (3) nominal is best. Example: Below are threeexamples of Target Values, one each for (1) smaller is better, (2) larger is better, and (3) nominal is best.Aug 20, 2012

Which of the following is the most important thing to look at when analyzing a histogram?

The shape

dispersion

The spread of the data

Which of the following allows you to tell what percentage should be certain distances from the mean?

The standard deviation

A bimodal distribution means that

There is "two of something" impacting the process

What are the benefits of a box and whisker plot?

They summarize data from multiple sources and display the results in a single graph

The purpose of a Gage R&R is

To determine the precision of the measurement system, To determine the percentage of total variation that is due to the measurement system, To determine the repeatability and reproducibility of the measurement system

What are the primary uses of a defect location check sheet?

To reveal the location on a part where defects are occurring

When you have a bell-shaped curve, none of the five M's or one P are

Unduly influencing the process

Rolled throughput yield

What term describes the probability that a product or service will go through all steps of the process without a defect?

Range

Which measure of variation describes the distance between the highest and the lowest points of data?

The standard deviation

Which of the following allows you to tell what percentage should be certain distances from the mean?

At the performance indicator identification tollgate, which of the following is true?

Your sponsor will want to know exactly what you are going to measure. If you have data in reports already, you should have that information available for your sponsor. If there are things close to what you need, you should be able to explain why we are not using those.

Counted data is

discrete