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DESIGN OF EXPERIMENTS. DOE STATISTICAL EXPERIMENTS By Mike Newtown. Why experiment? To increase knowledge about a process What good is increased knowledge? Increase the output of the process Reduce variability Produce a robust product that is not influenced by environmental factors.

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Design of experiments l.jpg

DESIGN OF EXPERIMENTS

DOE

STATISTICAL EXPERIMENTS

By Mike Newtown


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  • Why experiment?

    • To increase knowledge about a process

  • What good is increased knowledge?

    • Increase the output of the process

    • Reduce variability

    • Produce a robust product that is not influenced by environmental factors


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  • Why Experimental Design?

    • To obtain valid conclusions from an experiment

    • To yield the maximum amount of useful information with the least amount of experimentation (experiments cost money)


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  • Types of scientific studies

    • Experimental- variables of interest can be controlled

    • Observational- variables can not be controlled (data analysis)


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Good Experiments Should: experiment

  • Eliminate know source of bias

  • Guard against unknown source of bias


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Variation experiment

  • Experimental Errors:

    • Setting not exact enough to be fixed exact same point each time

  • Measurement Errors:

    • Inability to obtain exactly the same measurement on the successive, identical test runs


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Combat Variation experiment

  • Standardize procedure

  • Collect larger number of data points

Accuracy & Precision vs. Cost


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Scientific Method experiment

  • Investigate situation

  • Define problem clearly

  • Formulate hypotheses

  • Select appropriate experiment

  • Conduct experiment

  • Analyze results

  • Draw Conclusions

  • Take action on conclusions


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Statistics experiment

  • Mean

  • Range

  • Standard Deviation

  • Z tables

Are very important in analyzing data


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Hypothesis Testing experiment

  • In an experiment, we don’t test to see if our ideals are right, we test to see if they are wrong.

  • Null Hypothesis (Ho) statement of ideal as if nothing unusual was occurring

  • Alternative hypothesis (Ha)


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Lets see how this works experiment

Problem: Sub dough at Subway

Factor A: dough type (type 1 & 2)

Factor B: oven temperature

(125 and 140 Celsius)

Factor C: bake time (8 mins or 10 mins)

See board work


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Your Turn to try experiment

  • Paper Helicopters

  • See ENGS 101 Blackboard Site

  • Team competition for the longest flight time.

  • Using your experimental data taken Thursday in class design the optimal helicopter.