QUESTION 1

1. What is the important confound here?

   		The horses are not all equally fast.
   		The jockey who raced the horses is confounded with the training method.
   		The trainer could be biased because they are uninformed about the experiment.

QUESTION 2

1. One way to extend this research would be to ask if the conditions of the track might affect the results. Therefore, one could race each of the horses under dry track and wet track conditions. This experimental design is best thought of as:

   		3 x 2 mixed between, within factorial.
   		3 x 2 between group factorial.
   		3 x 2 PxE factorial.
   		3 x 2 within group factorial.

QUESTION 3

1. What would be a better experimental design?

   		The horses should first be matched in terms of their speed and then everything else should be done the same way.
   		An additional set of jockey s should be brought in to race the horses given the three different training plans. Specifically, extra jockey 1 should race plan A horses, extra jockey 2 should race plan B horses, and extra jockey 3 should race plan C horses.
   		Only one extra jockey who is completely blind to the experiment should be asked to race all the horses over a number of different days.