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Tag: z-score

  • Proportion testing

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    shotlefttodatascience
    in

    Using everything we’ve learned so far about the central limit theorem, the z-score, and hypothesis testing, we can now also perform proportion testing! There are just a few new concepts to add into the mix: The preliminary terrors – notation & terminology p = the proportion of items that falls into H0 q = the…

  • Hypothesis testing basics

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    shotlefttodatascience
    in ,

    A simple example of hypothesis testing is where we know what “normal” is, and we want to evaluate whether some sample conforms to our understanding of “normal”, or is so unusual that it’s indicative of an actual shift in behaviour or pattern. Make your hypothesis statement If I…(do this to an independent variable)….then (this will…

  • Central limit theorem – a worked example

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    shotlefttodatascience
    in

    Remember our formal definition: The CLT states that, provided enough samples are taken, the sample distribution of the sample mean will be normally distributed, regardless of the population distribution. In mathematical terms we say therefore that the sample mean is equal to the population mean: With enough samples this also happens – the sample standard deviation…