Standard Normal A normal distribution with a mean value of 0 Distribution and a standard deviation of 1 or 1s. Approximately 68% of the data in a normal distribution for a population is within 1 standard deviation of the mean. Empirical Rule for Approximately 95% of the data in a normal distribution Normal Distributions for a population is within 2 standard deviations of the mean. Approximately 99 .7% of the data in a normal distribution for a population is within 3 standard deviations of the mean. A number that describes a specific data z-score value’s distance from the mean in terms of standard deviation units. Probability The chance of something happening.
Standard Normal Distribution A normal distribution with a mean value of 0 and a standard deviation of 1 or 1s. Empirical Rule for Normal Distributions Approximately 68% of the data in a normal distribution for a population is within 1 standard deviation of the mean. Approximately 95% of the data in a normal distribution for a population is within 2 standard deviations of the mean. Approximately 99 .7% of the data in a normal distribution for a population is within 3 standard deviations of the mean. z-score A number that describes a specific data value’s distance from the mean in terms of standard deviation units. Probability The chance of something happening.
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