## Week- 1

### Correlation and Regression Graded Quiz

1.
Question 1
If you are studying the relationship between the
age of the manufacturing equipment at your facility and the hours of downtime
of that equipment, what would the DEPENDENT variable be?

1 point

• Neither the age of the
manufacturing equipment and the hours of downtime of the equipment
• Hours of downtime of the equipment
• Both the age of the manufacturing equipment and the hours of downtime of the equipment
• Age of the manufacturing
equipment

2.
Question 2
A scatter plot in which the plotted points are
clustered approximately into a straight line from the top left to the bottom
right of the graph is displaying which of the following:

1 point

• Bimodal correlation
• Positive correlation
• Negative correlation
• No correlation

3.
Question 3
If the
pass rate of exams increases with study time, then the correlation coefficient
for the study time versus exams would be:

1 point

• Between 0 and -1
• Greater than 1
• Between 0 and +1
• Equal to 1

4.
Question 4
Which of the following statements are true about
correlation?

1 point

• A negative correlation
coefficient means that there is not a strong relationship between the variables
• r can only range from 0 to 1
• The correlation coefficient can range from -1 to +1
• The lower the correlation
coefficient is, the weaker the correlation is

5.
Question 5
In the
equation for basic linear regression, what does the term “b” represent?

1 point

• The slope of the line
• The error
• The x intercept
• The y intercept

6.
Question 6
The least squares method is used for what?

1 point

• Determining the regression
equation
• Calculating the correlation
coefficient
• Simplifying algebraic
equations
• The central limit theorem

7.
Question 7
You collect sample data to calculate the
relationship between age of the manufacturing equipment at your facility and
the hours of downtime of that equipment.
Using data ranging from 0.5 years old to 20 years old for the equipment,
you obtain the regression equation for annual hours of downtime of y=10+0.5x
with a high correlation coefficient. How
many hours of downtime would you predict for equipment that is 8 years old?
(Round to the nearest 10th of a year)

1 point

• You cannot use this
regression equation to answer the question
• 8.0
• 14.0
• 4.0

8.
Question 8
Where is regression analysis most often used by
six sigma professionals?

1 point

• In the define phase for the
is-is not analysis
• In the improve phase to
estimate gains after the projected improvement
• In the analyze phase for
statistical sampling
• In the control phase for
the process behavior chart

## Week- 2

1.
Question 1
If you want to
test the claim that the mean length of widgets has changed from 4.3 meters,
what would your null hypothesis be?

1 point 2.
Question 2
A null hypothesis states that a process has not
changed over time. If a type II error is

1 point

One has failed to reject
the null hypothesis when it was true

One has rejected the null
hypothesis when it was true

One has failed to reject
the null hypothesis when it was false

One has rejected the null
hypothesis when it was false

3.
Question 3
Suppose you want to test the claim that the mean
length of process time has decreased from 12.3 minutes. Your sample data leads you to fail to reject
H0. The actual mean length is 12.0
minutes. What type of error, if any,

1 point

Another test should be done

A type II error has been

A type I error has been

4.
Question 4

what type of test will you
need to do?

1 point

Binomial

Right-tailed

Left-tailed

Two-tailed

5.
Question 5
While performing a hypothesis test, you
calculate a p-value of 0.05. If the
desired level of significance is 0.01 then the conclusion is:

1 point

Reject the null hypothesis
because there is a statistical difference.

Reject the null hypothesis
because there is no statistical difference.

Fail to reject the null
hypothesis because there is no statistical difference.

Fail to reject the null
hypothesis because there is a statistical difference.

## Week- 3

1.
Question 1
Maximizing the performance of one machine or one
department could have a negative effect on another machine or department, and
subsequently on the organization as a whole.
This is an example of:

1 point

Over-optimization

Productivity optimization

Alternate optimization

Sub-optimization

2.
Question 2
Employee empowerment is a key element of Kaizen.

1 point

True

False

3.
Question 3
Improvements through both Kaizen and Kaizen
Blitz must be carefully managed.

1 point

True

False

4.
Question 4
Deming’s version of the model is Plan, Do,
Study, Act. He changed check to study
because he wanted it to be a plan for management, and he wanted them to use
this step to compare results with predictions.

1 point

True

False

5.
Question 5
The PDCA model is complex, and you should have
an expert to lead the team.

1 point

True

False

6.
Question 6
Which of these statements best describes net
present value?

1 point

A way to determine the value of future
investments.

A way to determine the value of future benefits.

The sum of present values of incoming and outgoing cash flows over a period of time.

A way to compare present costs with future
costs.

7.
Question 7
Payback Period is usually

1 point

18 months.

24 months.

12 months.

It depends.

8.
Question 8
Internal rate of return usually reflects the
anticipated inflation rate.

1 point

True

False

9.
Question 9
When an organization first starts to address
quality issues, external failures are likely to go down, while both appraisal
costs and internal failures will go up.

1 point

True

False

10.
Question 10
Generally the cost of quality will be lowest
with a strong focus on:

1 point

Appraisal

External Failures

Prevention

Internal failures

## Week- 4

### Control Tools and Documentation Graded Quiz

1.
Question 1
An example of special cause
variation would not include:

1 point

Lack of supervision skills

No training

No preventive maintenance

No documentation

2.
Question 2
Control charts for averages
behave like what distribution?

1 point

Euler Phi

Normal

Weibull

Poisson

3.
Question 3
In order to have a rational
sample, we seek to have all of the following except:

1 point

Desired differences within samples minimized

Desired differences between samples minimized

Sub group size

Desired differences between samples maximized

4.
Question 4
If we want to detect a large
shift, we need a smaller sample size

1 point

True

False

5.
Question 5
Control is the process employed to meet customer
expectations

1 point

True

False

6.
Question 6
A pitfall of document control would not
include:

1 point

High Distribution

Lack of stakeholder
involvement

Old Revisions in use

Use of electronic media

7.
Question 7
One of focus areas in the P-D-C-A process is:

1 point

How do we control it

How do we do it

How do we plan it

What are our goals

8.
Question 8
Control charting is only for monitoring

1 point

True

False

9.
Question 9
Document management includes all processes
except:

1 point

Creation

Deletion

Distribution

All of the above

10.
Question 10
After
you assign causes and eliminate problems, you need to remove the _____________.

1 point

centerline

out of control points

upper and lower limits

points on the centerline