Appendix E 455 



When the data are complete, they can all be summed up for 

 each tuber-unit and the units compared. 



Each student should next make out a score-card embodying 

 the points of his ideal unit, and score his units by it. The 

 instructor may now give out a score-card by which the whole 

 class may score their units alike. 



Make up hills weighing , 1, 1, .2, 3, and 4 pounds, and 

 draw them natural size. 



Compute the yield per acre from the above weights per hill, 

 assuming the hills to be planted in rows 3 feet apart and 18 

 inches apart in the rows. One bushel weighs 60 pounds. 



Directions for Report on Potato Selection 



1. Distribute the data for the number of tubers per hill into 

 classes. 



2. Determine the mode, modal coefficient, mean, standard 

 deviation, coefficient of variability, and their probable errors for 

 the number of tubers per hill. 



3. Determine the mode, mean, standard deviation, and co- 

 efficient of variability for the number of marketable tubers per 

 hill, weight of tubers per hill, and weight of marketable tubers 

 per hill. 



4. Draw Quetelet curve, showing frequency distributions for 

 number of tubers per hill, number of marketable tubers per 

 hill, weight of tubers per hill, and weight of marketable tubers 

 per hill. 



5. Distribute into classes the data for the number of tubers 

 per four-hill-unit, number of marketable tubers per four-hill- 

 unit, weight of tubers per four-hill-unit, and weight of market- 

 able tubers per four-hill-unit. 



6. Draw Quetelet curves, showing frequency distributions for 

 number of tubers per four-hill-unit, number of marketable tubers 

 per four-hill-unit, weight of tubers per four-hill-unit, and weight 

 of marketable tubers per four-hill-unit. 



