Statistics and Data Analysis-part 3
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1) Implement example from page 12-14:
   -->   generate datapoints + add some errors
   -->   evaluate chi2
   -->   perform chi2 consistency test

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2) Implement example from page 21-23:
   -->  generate datapoints and add some errors
   -->  find the best straight line and uncertainties
        implement formulas, get numerical values
   -->  draw datapoints and fitted line  	  

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3) Implement example from page 24-27:
   -->  generate datapoints and add some errors
   -->  find the best straight line and uncertainties
        implement formulas, get numerical values
   -->  draw datapoints and fitted line  	  

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