statistics_09.2

statistics_09.2 - Class9.2:Statistics...

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    1 Class 9.2: Statistics Working With Uncertainty
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    2 RAT 1 Please close books and  notes.  Turn off computer  screen.
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    3 Objectives Describe the difference between a sample and  a population  Learn to use descriptive statistics (data sorting,  central tendency, etc.) Learn how to prepare and interpret histograms State what is meant by normal distribution and  standard normal distribution. Use Z-tables to compute probability.
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    4 Statistics then there’s statistics.” -- Mark  Twain
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    5 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, safety)
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    6 Populations and Samples Population  - complete set of all of  instances of a particular object  e.g., the entire class of students Sample  - subset of the population e.g., a team of students from the class We use samples to draw conclusions  about the parent population, which often  we cannot measure in totality.
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    7 Why use samples to estimate  population? 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 the sample bolt strength
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    8 Team Exercise: Sample Bias To three significant figures, estimate the  average age of the class based upon  your team. When would a team not be a  representative sample of the class?
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    9 Measures of Central  Tendency If you wish to describe a population (or a  sample) with a single number, what do you  use? Mean  - the arithmetic average  Mode  - most likely (most common) value. Median  - “middle” of the data set.
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  10 What is the Mean? The 
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This note was uploaded on 02/15/2010 for the course ENGR 111 taught by Professor Walker during the Fall '07 term at Texas A&M.

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statistics_09.2 - Class9.2:Statistics...

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