Frequency & Probability Distributions

Frequency & Probability Distributions

1. Probability Distribution

   • "A formula, table, or graph that gives the probability associated with each possible x value "
     • characteristics
       • the area under the curve between any specified points represents the probability of obtaining scores within those specified points
       • The total area under the curve = 1
     • common probability distributions
       • Gaussian DIstribution (AKA SND)
         • http://www.itl.nist.gov/div898/handbook/eda/section3/eda3661.htm
       • Student's t distribution
         • http://www.itl.nist.gov/div898/handbook/eda/section3/eda3664.htm
       • Chi Square distribution
         • http://www.itl.nist.gov/div898/handbook/eda/section3/eda3666.htm
       • F distribution
         • http://www.itl.nist.gov/div898/handbook/eda/section3/eda3665.htm

2. Frequency Distribution

   • "table showing number (frequency) of items in each category "

3. Knowledge Dependencies

   • area under curve
   • random variables
     • variables
   • area under curve
   • central tendency & spread

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