[Ask ] How to reconstruct this sentence?
A longstanding rule of thumb for calculating sample sizes has been that
the sample size required to detect a departure from the expectation that
the joint effect of two variables is multiplicative is at least four times
the sample size that is needed to evaluate the main effect of each of
the variables.
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the sentence above has made me confused for about 30 minutes...
so can anyone help me...@@"?
thanks a lot :)
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