Chapter 07 - Chapter 7 Producing Data Sampling Essential...

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Essential Statistics Chapter 7 1 Chapter 7 Producing Data: Sampling
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Essential Statistics Chapter 7 2 Researchers often want to answer questions about some large group of individuals (this group is called the population ) Often the researchers cannot measure (or survey) all individuals in the population, so they measure a subset of individuals that is chosen to represent the entire population (this subset is called a sample ) The researchers then use statistical techniques to make conclusions about the population based on the sample Population and Sample
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Essential Statistics Chapter 7 3 Bad Sampling Designs Voluntary response sampling allowing individuals to choose to be in the sample Convenience sampling selecting individuals that are easiest to reach Both of these techniques are biased systematically favor certain outcomes
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Essential Statistics Chapter 7 4 Voluntary Response To prepare for her book Women and Love , Shere Hite sent questionnaires to 100,000 women asking about love, sex, and relationships. 4.5% responded Hite used those responses to write her book Moore ( Statistics: Concepts and Controversies , 1997) noted: respondents “were fed up with men and eager to fight them…” “the anger became the theme of the book…” “but angry women are more likely” to respond
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Chapter 7 5 Convenience Sampling Sampling mice from a large cage to study how a drug affects physical activity lab assistant reaches into the cage to select the mice one at a time until 10 are chosen Which mice will likely be chosen? could this sample yield biased results?
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Chapter 07 - Chapter 7 Producing Data Sampling Essential...

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