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States review
Statistics information to learn
| Term | Definition |
|---|---|
| Variance? | The average of squared deviations from mean |
| How is the empirical rule used | 68% fall within the positive negative 1 S.D., 95% fall within the positive negative 2 S.D, and 99.7% fall within the positive negative 3 S.D. |
| Explanatory variable | It helps explain or predict changes in a response variable (independent) |
| Response variable | It measures outcomes in a study or how it is affected by explanatory (dependent) |
| Voluntary response sample | A method of sampling that allows people to choose to be in the sample by responding to a general invitation. |
| Convenience sample | A method of sampling that selects individuals from the population who are easy to reach. |
| What is the difference between single blind and double blind in a convenience sample? | Single: One group knows while the other group doesn't. Double: Neither groups know what treatment they are receiving. |
| Law of large and small numbers | Law of large numbers: As we observe more and more trials of any random process, the proportion of times that a specific outcome occurs approaches its true probability. Law of small numbers: doesn't exist but people believe in it "third time is a charm" |
| Random variable | Takes numerical values that describes the outcomes of a random process. |
| Outliers | The observations that lie outside the pattern of a distribution. |
| Statistics | Number that describes the sample for example the sample mean or (xbar) |
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