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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutor3 : Hello Student, May I help you with your Math problems?
student : hello!
student : yes please
student : I'm stuck on one problem
student : can you please help me?
tutor3 : yes
student : I have to Evaluate: Cov(1-(1/2)X,5X-6)
student : and its tricky because there are two "X''s, as you can see
tutor3 : ok.lets see
tutor3 : please wait a while
student : ok
student : thank you
student : any help would be very appreciated
tutor3 : the hint is cov(x,y)=E(xy)-E(x)*E(y)
student : thank you
student : i know that, but do i apply it
student : even though i have X's in both?
tutor3 : see when you have a cov(x,y) structure as Cov(x,x) it is nothing but changes to variance. so go ahead and apply it.
student : okay!
student : thank you so much
tutor3 : welcome

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