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Z score standard normal table3/14/2024 ![]() ![]() In case you are looking for a more technical definition, then we can say that the z score is a measure of how many standard deviations there are that are above or below the population mean. A z-table is a table that tells you what percentage of values fall below a certain z-score in a standard normal distribution. The mean for the standard normal distribution is zero, and the standard deviation is one. The z-score, which is also known as the standard score, is the number of standard deviations from the mean a data point is. For example, if the mean of a normal distribution is five and the standard deviation is two, the value 11 is three standard deviations above (or to the right of) the mean. A z-score is measured in units of the standard deviation. When you calculate a z-score you are converting a raw data value to a standardized score on a standardized normal distribution. The standard normal distribution is a normal distribution of standardized values called z-scores. ![]() Recognize the standard normal probability distribution and apply it appropriately Score Table- chart value corresponds to area below z score. ![]()
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