inst13.2

# inst13.2 - Class 13.2 Statistics Dealing With Uncertainty...

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Class 13.2: Statistics Dealing With Uncertainty

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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.
RAT 1 Please close books and  notes.  Turn off computer  screen.

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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)
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
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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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
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## This note was uploaded on 09/01/2009 for the course PSYC 300 taught by Professor Cambron during the Spring '08 term at Texas A&M.

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inst13.2 - Class 13.2 Statistics Dealing With Uncertainty...

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