In words, what null hypothesis is tested by the Box M value on the SPSS GLM printout

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In words, what null hypothesis is tested by the Box M value on the SPSS GLM printout for a MANOVA? Do you want this Box M test to be statistically significant? Give reasons for your answer. If Box M is statistically significant, what consequences might this have for the risk of Type I error and for statistical power? What might you do to remedy this problem?
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