Investigates the alleged practice of rubber tire manufacturers competing on the retail level with their own tire dealers, pt. 1; Contains supplementary statements and material from tire dealers and tire company spokesmen regarding alleged direct sales of tires by the tire companies to customers, pt. 2.
Investigates the alleged practice of rubber tire manufacturers competing on the retail level with their own tire dealers, pt.1; Contains supplementary statements and material from tire dealers and tire company spokesmen regarding alleged direct sales of tires by the tire companies to customers, pt. 2.
We shall examine the validity of 16 experimental designs against 12 common threats to valid inference. By experiment we refer to that portion of research in which variables are manipulated and their effects upon other variables observed. It is well to distinguish the particular role of this chapter. It is not a chapter on experimental design in the Fisher (1925, 1935) tradition, in which an experimenter having complete mastery can schedule treatments and measurements for optimal statistical efficiency, with complexity of design emerging only from that goal of efficiency. Insofar as the designs discussed in the present chapter become complex, it is because of the intransigency of the environment: because, that is, of the experimenter’s lack of complete control.
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