We want to test the effect of water color onto aggressiveness of a fish species.

Question

We want to test the effect of water color onto aggressiveness of a fish species. We have 12 tanks with 2 fish in each. We then add food coloring (red, yellow, green) or water (control), i.e., 4 treatments to 3 tanks for 2 days during which interaction behavior between the fish is evaluated. At this point, the water is replaced by clean water in all tanks and the fish are given time to return to their initial behavior. A new color (determined randomly) is then added and the process is repeated until each tank has been exposed to all 4 treatments. The random variable is?

a. Time

b. The fish tnaks

c. Groups of tanks

d. None

Explanation / Answer

Here the random varible is aggresivenes of fish.

becasue other variables are all pre determined.

For example Time is fixed. The fish tanks are fixed. Groups of tanks recievingsame treatment that's also fixed.

so, which is not known to us is the aggresiveness of fishes.

that's random variable

so, answer should be'none' !

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