STATS 250 Chapter Notes - Chapter 7: Minitab, Unimodality, Probability Distribution
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STATS 250 Full Course Notes
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Learning objectives: normal distribution is the most commonly used distribution among all probability distribution. Normal probability distribution has many practical applications, for example, where the random variables are human characteristics such as weight, height, iq scores, length and speed. It must be remembered that normal does not mean the general type of distribution to be expected. Rather normal means the type that frequency distribution of certain variable tend towards normal. 7. 1 some important characteristics of normal probability distribution. Area under the normal curve specifies the probabilities for the normal random variable. Approximately 68% of the values of a random variable in a normally distributed population lie within + standard deviation. Approximately 95. 5% of the values of a random variable in a normally distributed population lie within + 2a standard deviation. Approximately 99. 7% of the values of a random variable in a normally distributed population lie within + 3 standard deviation.
