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Consider a 2 x 2 factorial. How many replications are required to estimate the interaction beta to within two units with a 90% confidence interval?

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Consider a 2 x 2 factorial. How many replications are required to estimate the interaction beta to within two units with a 90% confidence interval? Assume that the standard error of the estimate of the interacton beta is approximatedly 3. Please directly enter your number (no steps are required, no text, just enter the number).

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