| 单词 | null hypothesis |
| 释义 | null hypothesis The hypothesis that a variable has no effect. For example, in investigating the relation between income and saving, the null hypothesis could be that the income level of an individual does not affect the proportion of income that is saved. Observations of a sample of individuals' income and saving are then used to see whether any observed deviations from the null hypothesis could have arisen purely through sampling error. If richer individuals are found to have significantly higher savings ratios than poorer ones, the null hypothesis that the savings ratio is independent of income is not accepted. |
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