Transcript ELEC 423 Digital Signal Processing

DATA & DECISIONS
ELEC 412
PROF. SIRIPONG POTISUK
The Need for Statistical Methods
 “Quality is job one”
 “…..The basic concept of using statistical signals to
improve performance can be applied to any area
where output exhibits variation, such as component
dimensions, bookkeeping error rates, performance
characteristics of a computer information system, or
transit times for incoming materials…..”
Continuous Process Control Manual
Ford Motor Company
The Need for Statistical Methods
“…..As world competition intensifies, understanding
and applying statistical concepts and tools is
becoming a requirement for all employees. Those
individuals who get these skills in school will have a
real advantage when they apply for their first job.”
Paul H. O’Neill
CEO, Aluminum company of America
The Need for Statistical Methods
“ The competitive position of industry in the US
demands that we greatly increase the knowledge of
statistics among our engineering graduates…….. The
economic survival in today’s world cannot be ensured
without access to modern productivity tools, notably
applications of statistical methods.”
Arno Penzias
VP at AT&T Bell laboratories
A Model for Problem Solving
 State the problem or question
 Collect and analyze data
 Interpret the data and make decisions
 Implement and verify the decisions
 Plan next actions
The Creative Process
From Data Tables to Probability
Goal: Improving the quality of any process
Solution: Using tools of statistics to make decisions from
data in an organized way.
How do we obtain good data on which to base
these decisions?
Most good plans for collecting data make use of
randomization which is tied to probability