studies on oat breeding. 

 Table 7. 



173 



Constants of Variation in Yield (Bushels per acre) for the 

 Four ipij Plots of Each Variety. 



Variety. 



Mean. 



Standard 

 Deviation. 



Coefficient 



of 

 Variation. 



Imported Scotch 



Lincoln 



Abundance 



Irish Victor. 



Kherson 



American Clydesdale 



Silver Mine 



Minnesota No. 26 



Prosfjerity 



Siberian 



Early Pearl 



Regenerated Swedish Select 



President 



Victor 



Banner 



White Plume 



Garton No. 5 



■Gold Rain 



Rebred 60-Day 



Daubeney 



Senator 



Average 



67.66±0.81 

 65.94±1.11 

 64.22±1.16 

 67.03±1.22 

 60.79±1.28 

 62.75±1.38 

 57.81±1.28 

 67.74±1.57 

 62.97±1.69 

 71.10±1.87 

 69.68±2.00 

 60.93±1.81 

 62. 97 ±2. 05 

 59. 53 ±2. 29 

 62.74±2.63 

 63.44±2.84 

 51.52±2.52 

 65.16±3.25 

 54.38±3.35 

 52.19±3.51 

 51. 72 ±4. 28 



62.01 



2.40 

 3.28 

 45 

 63 

 79 

 10 

 78 

 66 



5.02 

 5.55 

 5.93 

 5.36 

 6.08 

 6.80 

 7.79 

 8.41 

 7.47 

 9.64 

 9.93 

 10.41 

 12.68 



±0.57 

 ±0.78 

 ±0.82 

 ±0.87 

 ±0.90 

 ±0.98 

 ±0.90 

 ±1.11 

 ±1.20 

 ±1.32 

 ±1.42 

 ±2.28 

 ±1.45 

 ±1.62 

 ±1.86 

 ±2.01 



6.20 



3.54 



4.97 



5.37 



5.42 



6.23 



6.53 



6.55 



6.83 



7.96 



7.81 



8.52 



8.80 



9.66 



11.42 



12.41 



13.26 



14.51 



14.79 



18.26 



19.95 



24.51 



±0.85 

 ±1.20 

 ±1.28 

 ±1.30 

 ±1.49 

 ±1.56 

 ±1.57 

 ±1.64 

 ±1.91 

 ±1.87 

 ±2.05 

 ±2.11 

 ±2.09 

 ±2.76 

 ±3.00 

 ±3.22 

 ±3.53 

 ±3.61 

 ±4.50 

 ±4.94 

 ±6.19 



10.35 



The mean yields for 191 3 have been discussed in connection 

 with Table 6. They are repeated here for convenience and 

 also to give some idea of their probable errors. 



The following points are brought out by this table: 



1. The Standard deviation ranges from 2.4 bushels per acre 

 m the Imported Scotch to 12.68 bushels in the Senator. The 

 average for all the varieties is 6.2 bushels. 



2. These standard deviations are subject to probable errors 

 ranging from one-half bushel to three bushels. 



3. The coefficient of variation in the Imported Scotch is 

 3.54 percent and in the Senator it is 24.51 percent. As meas- 

 ured by the coefficient of variation the Senator plots in 19 13 

 were seven times more variable than the Imported Scotch plots. 

 The average coefficient of variation for all varieties is 10.35 

 percent. 



4. Of the varieties tested in 191 3 the Imported Scotch was 

 dy far the least variable. It may be stated here that so far as 

 could be ascertained by observation the four Imported Scotch 

 plots were grown under as widely different conditions as the 

 plots of any other variety. It may, therefore, be tentatively 



