Ch. 7 REVIEW PROBLEMS 233 



Compute b and r, describe the price as elastic or inelastic, and bring the size of r 

 into your discussion as suggested in problem 18. 



20. Given the following data on turkeys, solve as in problem 19: 



Year: 1930 



Price (cents/lb) F: 15.9 

 Consumption (lb) X: 1.8 



Year: 1938 



Price (cents/lb) Y: 17.9 

 Consumption (lb) X: 2.7 



Year: 1946 



Price (cents/lb) Y: 22.6 

 Consumption (lb) X: 4.5 



Given: SZ 2 = 175.38, 2ZF = 1041.46, S(y 2 ) = 203.7361. 



Ans. CI 96 : 1.0 < /3 < 3.4, r = .58. 



21. Referring to problems 19 and 20, were the beef or the turkey prices rela- 

 tively more stable during the period 1937 to 1946? Give statistical evidence 

 for your answer. 



22. The earliness with which chickens obtain their feathers is economically 

 important to persons who raise broilers because it affects the rapidity and 

 cleanness of dressing. Early feathering, a sex-linked characteristic, is chiefly 

 dependent upon one gene locus on the sex chromosome. Its inheritance can 

 be described diagrammatically as follows: 



= late-feathering female, 



= early-feathering female, 



= late-feathering male, 



= early-feathering male. 



If late-feathering females are mated to early-feathering males, what is the 

 expected number of: (a) late-feathering females among the offspring, (b) late- 

 feathering males, (c) early-feathering chicks of either sex among 1000 offspring? 



Ans. (a) none; (b) 500; (c) 500, all females. 



23. Suppose that the late-feathering males in a flock can be assumed to have 

 two-thirds of type LI and one-third of type LL. If these males are mated to 



