statistics

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Basic statistics - 07. The degrees of freedom - explained with a simple exampleIf we would estimate the population standard deviation with the following formula the degrees of freedom is then equal to the total sample size -1. Because we first need to estimate the population mean value before we calculate the standard deviation.

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Basic statistics - 05. Confidence intervalsWe have learned standard of mean in last notes, so how can we use it? we can use it to calculate a confidence interval.

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Basic statistics - 02. The Normal distributionexamples： the heights of the populations sigma represents the standard deviation for the normal distribution curve, the area below the curve is always one. For example: we can use the area to get the rough estimation of individuals taht are between 190 an

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