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1. |
Describe
this activity as a scenario. How
will a coca cola bottling process fill a 12 oz can?
The target is 12 oz, however, due to the physical
limitation, the actual amount filled can rarely be
exactly 12 oz, they vary (variation). Further, the
average amount filled by a process is usually different
form the target 12 oz (bias). An important task in
controlling the quality is to reduce both bias and
variation. Now it is your turn to conduct a simple
experiment to experience the bias and variation. |
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2. |
Decide to
have your class:
- Participate in selecting your own
box activity (pass code is required). Go to step
3
-OR-
- Use the data collected by other
classes (no pass code required). Go to step 4.
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3. |
Engage
students in the data measurement and data collection
stage.
- Use students to draw their own best
judgment of two inch line segments, ten times, without
using a ruler.
- Emphasize that they can not use any
device to help them draw the line segments.
- After drawing their own two inch
line segments give each individual a ruler and have
them measure and record the length (up to 1/10 unit
and run off to two decimal places. e.g
15/16=1.94, 2 1/8=2.13)
- Direct students to the "Add Data"
page for this activity.
-Go to Data Entry, select Activity Draw_Line
-Click on "Add Data"
-Provide the pass code for students to make their
selection of ten boxes.
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4. |
Direct
students to the Data Download
page to download the data.
- Click on "Data Download", select
the activity Draw_line, then click on Select Data.
- You may select the entire data set
or a subset. Ask students to follow your
instructions to download the data based on the
available criteria.
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5. |
Direct
students to analyze the data.
You should have chosen what statistical tool your class
will be using for analyzing the data.
• You may use the software at your local computer lab.
• You may use the
online software, "Crunch_It"
at http://www.statcrunch.com/.
For first time
users you need to sign on to the
site. Please stress that
students need to remember their
own ID and password. Direct students to
input
the data and analyze the data. Be more focused on what
tools are to
be used for analyzing this distance data based on
the purpose of this activity.
Suggested Questions for Classroom Activities
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6. |
Facilitate
the discussion of the results. |
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- Point of different analogies in
manufacturing process that are similar to this
activity.
- Emphasize the importance of reduce
bias and variation in real world applications for
improving quality.
- Discuss why between subject
variation is usually larger than within subject
variation.
- Review the sampling distribution of
sample mean and discuss its application in this
activity.
- Control charts and R-charts or
S-charts may be introduced here.
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7. |
Assessment:
Online Self-Test for Students
Suggested Questions for Classroom Activities
Suggested Questions for Homework and Projects |
