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Suppose (X,Y) follows bivariate normal distribution with means μ1,μ2, standard deviations σ1,σ2 and correlation coefficient ρ, where all the parameters are unknown. Then testing H0:σ1=σ2 is equivalent to testing the independence of

1. X and ˉY

2. X and XY

3. X+Y and Y_

4. X+Y and XY
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