STS 110 Chapter 6.1: STS 6.1
15 Mar 2018
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Document Summary
Flipping a coin: theoretical probability of heads. Theoretical is what should happen if you don"t look at any data. Empirical is what is actually the outcome of your experiment. Statistically signi cant: flipping a coin 100 times and getting 48 heads, no. It is not close to 50/50: flipping a coin 100 times and getting 80 heads, flipping a coin 100 times and getting 61 heads, hard to say. If the outcomes of a comparison between groups cannot be explained by chance" we say the di erences are statistically signi cant. In statistics, if the probability of an event is less than 0. 05, or if the event occurs less than 5% of the time, we say the event is statistically signi cant. Ex1: in the past analysis of weather, it was shown that from 2001-2010, the hottest 10 years on record happened.
