362 MR. S. M. JACOB ON 



(i) Ray a. The 30 villages chosen all lie in the Darp Assessment Circle. 



(a) Kharif. 



The regression equations are : — 



For the regression of crop on rain 



C K =53-251 &« + 1914*4 

 and for the regression of rain on crop 



C= 250*74 R K - 1978-1. 



Figure 1 shows the distribution of crop and rainfall, the ordinates of the point 

 marked with small closed curves giving the crop and the abscissae of these points the 

 rainfall corresponding, according to the scale given in the diagram. 



The probable error of a prediction of the mean value of the crop given by a 

 certain rainfall is 115 acres. 



It will be convenient to call this probable error E c 



(b) Rabi. 



The regression equations are : - 



For crop on rain 



^=339-07^+3164 

 For rain on crop 



0=979-02 R P - 349-3- 

 The value of E c = +235. 



The distribution and the regression lines are shown in Figure 2. 



(ii) Pasrur. The 30 villages are all in the Pasrur Assessment Circle. 



(a) Kharif. 



The regression equations are : — 



For crop on rain 



Ck = 56-935^+3213-5. 

 For rain on crop 



Ck = 578*78 R K -yg42 

 and £,= +174. 



The distribution and regression lines are exhibited in Figure 3. 



(b) Rabi. 



The regression equations are : — 



For crop on rain 



= 276*8 + 4990-4. 

 For rain on crop 



O = i30 I Rp -2076-6 

 and E e = ± 350. 



The distribution and regression lines are given in Figure 4. 



