Probability Distributions

Probability Distributions

1. standard deviation has a close relationship with the normal distribution or bell-shaped curve

2. Aka sample distributions & distibution patterns

   • distribution of all possible values that can be taken by that statistic.

3. formed by calculating that statistic for each of a large number of samples of the same size that are drawn randomly from the population

4. Normal distribution curve aka standard normal distribution

   • continuous and can display any value from a dataset; it is a smooth, bell-shaped curve that is symmetric about the mean of the distribution.
     • symbol for the sample mean is .
   • defined by a formula in which there are only two sample variables
     • mean and standard deviation (SD).

5. NORMAL DIS = PROB DIS so the area under the curve is equal to 1

   • calculating probabilities using curve

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