Control Charts: This quality control method helped Quest Diagnostic streamline and improve their system for processing and testing

lab samples so they could meet their nightly deadlines.

As you watch the video, please complete the following questionnaire and submit with your assignment. $(15$ Marks$)$

was among the first to champion the idea of statistical process management.

Deming's emphasis on long term thinking and

improvement were vital in bringing

about the so$-$called "Japanese Miracle."

In statistics, a process is a chain of steps that turns inputs into outputs. Statisticians say a process that's running

smoothly with its variables staying within an expected range is

How many tests per day does Quest Labs perform?

A patient's

is the input of the process at Quest. The

is the output.

Tests are sorted by

$EE$

of test.

Quest's Seattle processing lab aimed to get all specimens logged an and ready by

Quest needed to know where the process stood at present. How close were they to meeting that $2$ a$.$m$.$

and how much did finish times

$?$

variation is due to the day to day factors that influence a process. Some

examples of this type of variation at Quest are

and

Special Cause variation: Sudden unpredictable events that can throw a wrench into the works. Some examples

for Quest are

Control Charts: The centre line is the

finish time of

The control limits are set

$\_$standard deviation

and

the target.

In a normal distribution $99\mathrm{.}7\%$ of the data is within

standard deviation of the mean.

One dead giveaway that the finish times are out of control is if a point falls

the control

limits$.$Data begins to look "suspicious when they have this many point on this side of the

there's some

that is more than

The company remodelled the entire department the changed brought the mean finish time much closer to the

target. The remaining variation clustered more tightly around the

Once you have fundamentally improved the process and changed it$,$ that's when you recalculate the