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| Central Limit Theorem (CLT) |
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Definition
| All averages of many samples will lead to a bell shaped curve. Taking samples of a parent population and plotting the frequency distribution of sample means. |
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| Theoretical distributions that describe the relationship between population samples. Provides the information necessary for making inferences. Provides the information to predict where a sample is located in the population. |
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| Standard normal disributions |
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Definition
| Bell shaped curve. Unseful to analyze models with normal distribution, unimodal and roughly symetric shapes. |
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Definition
| Standerdized value measuring how far away from the mean a certain value is using standerd deviation as a ruler. A value that is 1.5 sd above the mean will have a z-score of 1.5. |
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NORMAL DISTRIBUTION
68% of the samples lie 1sd away from the mean
95% lie 2sd away from the mean
99.7% lie 3sd away from the mean |
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Definition
| Explanatory variable (ex gender) as row variable, resopnse varible (alcohol consumtion as colum variable. |
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