ENH 440 Lecture Notes - Lecture 6: Ronald Fisher, French Wine, Null Hypothesis
3 Nov 2016
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When you think there is a relationship, but actually there is none. There is a relationship, but you concluded that there was no relationship. Something was going on, but you missed it. Ronald fisher: asserted that smoking does not cause lung cancer, an example of type 2 error. Response variable: cause of death: ex. What is the explanatory, the response and what is the null hypothesis: music and wine buying scenario. Null hypothesis: there is no relationship between buying wine and the type of music played. Proportion of wine sold: 52 / 82 = 0. 63. You can be dealing with a numerical data, but it can be used as categorical data as well. Null hypothesis: there is no relationship between cannabis use and car accidents. Users that take cannabis is 0. 028 more likely to get into crash. Comparing the probability of something happening versus of the probability of it not happening. O = 202 * 521/ 99 *159 = 6. 68.
