Basisstatistiek

5 important questions on Basisstatistiek

What are quantitatively methods of assessing normality?

Zskew Zkurt
Normality tests

How does a q plot look with perfect normal distribution?

All the dots are on the line (so straight line)

What are Zskew and Zkurt?

Zscore to assess deviation from the centre

Zskew=skew/SEskew
Same goes for Zkurt  
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What are two normality tests?

Shapiro wilk (good for data sets less than 50)
Kolmogorov- Smirnov for larger data sets


If p is greater than 0,05 the data are normally distributed

If a dataset has huge outliers what is the best to report and why?

Median and IQR
since the mean and standard deviation are heavily influenced by big outliers

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