Question: when doing any study, we sample randomly, if at all possible. which one of the following best explains why? 1 it decreases the amount of

when doing any study, we sample randomly, if at all possible. which one of the following best explains why?

1 it decreases the amount of spread(or, variation) in the data.

2 it allows us to use the most treatment combinations.

3 it's always less expensive than sampling nonrandomly

4 it helps reduce sample risk due to bias.

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