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Stats Ch 5
Term | Definition |
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Standardizing | The process of eliminating units in order to compare and combine original variables that have different units and magnitudes. |
Standardized Value | A value found by subtracting the mean and dividing by the standard deviation. |
Normal Model | A useful family of models for unimodal, symmetric distributions. |
Parameter | A numerically valued attribute of a model, not data. |
Statistic | A calculated value from data to summarize aspects of the data, not based on a model. |
z-score | A number using a standardized value telling how many standard deviations a value is from the mean. |
Standard Normal model | N(0,1) |
Nearly Normal Condition | This can be assumed if a histogram of the data shows a distribution that is both unimodal and symmetric. |
68-95-99.7 Rule | The percents between +/- 1, +/- 2, and +/- 3 standard deviations from the mean. |
Normal Percentile | Corresponds to the z-value giving the percentage of values in a Normal distribution found at that z-score or below. |