chap24_2010

# chap24_2010 - Chapter 24 Survey Methods and Sampling...

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Chapter 24 Survey Methods and Sampling Techniques

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Sample Statistics Mean, Median, Mode and standard deviation When calculated from sample data are called sample statistics When calculated from the entire population, they are called population parameters. For practical reasons we usually analyze a portion (sample). Each sample statistic posses a probability distribution know as its sampling distribution. A sample survey gathers information from a portion of the population.
Planning a questionnaire Designers job: Define the purpose of the survey Choose the questions to include Determine appropriate future actions based on survey results. Voice of Customer (VOC) – Six Sigma’s approach to listening to the customer

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Steps to conduct a survey 1. Clearly define project goals – what do you need to know about the customer? (VOC) 2. Determine population – whom should be surveyed 3. Select sample of respondents 4. Systematic sampling is a common sampling method 5. Consider using random cluster sampling when each member of the population belongs to a subgroup 6. Consider the need for precise results
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