Planned Comparisons, Vectors, and Variance

You have two planned comparisons’ vectors: [-1,-1,2] and [-1,0,1]. What is the angle between these two vectors (in degrees) and what does this mean for their variance?

I managed to find that the angle was 30 degree by using the dot product formula and that these planned comparisons were not orthogonal, but I didn't understand what could be said about their variance. Could you please explain it in simple terms for me?

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.