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Class 7 - Introduction to Statistics Class 07 Statistics is...

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    Introduction to Statistics Class 07
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    Statistics is... a standard method  for...  - collecting, organizing, summarizing,       presenting, and analyzing data  - drawing conclusions  - making decisions based upon the  analyses of these data. used extensively by engineers (e.g.,  quality control)
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    Populations and Samples Population  - complete set of all of the  possible instances of a particular object  e.g., the entire class Sample  - subset of the population e.g., a team We use samples to draw conclusions  about the parent population.
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    Why use samples? The population may be large all people on earth, all stars in the sky. The population may be dangerous to observe   automobile wrecks, explosions, etc. The population may be difficult to measure  subatomic particles. Measurement may destroy sample bolt strength
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    Measures of Central  Tendency If you wish to describe a population (or a  sample) with a single number, what do you  use?
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