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Study Guide 3.4
Term | Definition |
---|---|
z score (standarizd value) | the number of standerd deviation that a given value x is above or below the mean; The z score is caculated by using the folling Sample or population round z scores to two decimal places(such as 2.46) |
percentile | are one type of quantitites or factiles which partition data into groups with roughly the same number of values in each group; are measures of location denoted P1,P2,...,P99 which divide a set of data into 100 groups(with about 1% of the values in each gr |
ordinary values | -z<z score <z |
unusual values | z score< -z or z score> z |