Statistical inference
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1. Statistical analysis:
   what are principle of experimental desig for data collection.

2.  Could you explain what is a Simpson paradox. 

3.  Coefficient of determination R^2 is often used to access variability
    of prediction explained by the model and to quantify quality of the model.
    Could you explain the meaning of it.

4.  Could you explain concept of hypothesis testing with randomisation

5.  Could you explain how to determine confidence intervals with bootstrapping

6.  If you assume matematical model for your data, how the hypothesis testing
    and confidence level estimate is performed.