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Chi Square Statistic

Chi Square Statistic

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Chi Square Statistic

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  1. Chi Square Statistic Used to evaluate sampling fluctuation

  2. Expected and Observed Values Expected value – what should happen, think of theoretical probability A coin should land 50% heads and 50% tails Observed value – the results from when you do the experiment, think of experimental probability Actually flipping a coin 100 times and getting heads 60 and tails 40

  3. Chi Squared Measuring weirdness of something This calculation is used for all the observed values The chi squared is then the sum of all of the results

  4. What does Chi Squared tell us What happens to the Chi Squared when the data gets weirder Use our data to come up with this answer

  5. Assigning Probabilities Prob of getting this specific chis squared statistic or larger when null hyp is true The closer Chi Squared is to zero the more likely the null hyp is true The Closer the Chis squared is to zero the higher the percentage is