ECMT Quiz 3 (1 Viewer)
- Thread starter Some_Guy
- Start date
k. I rang two of my friends I made in the tutes, one hasn't started (wtf) while the other's still stuck in part 2 and we both came to the conclusion that the part 2 question was er... impossible to do. Did anyone here also come to the same conclusion?
PS Is anyone here at all?
Also, Lecture Notes/Textbook does not seem to help at all. ECMT = the worstest subject in the history.
PS Is anyone here at all?
Also, Lecture Notes/Textbook does not seem to help at all. ECMT = the worstest subject in the history.
I think 2a) and 2b) are both wrong, c, d, e seem fine however.
The problem for me is finding the correlation and co-efficient between X and Y, I can do it but it takes me ages and I can't help feeling there must be a shorter way. ???
@Brogan. It's true. Also it's from New Zealand. We Lose.
The problem for me is finding the correlation and co-efficient between X and Y, I can do it but it takes me ages and I can't help feeling there must be a shorter way. ???
@Brogan. It's true. Also it's from New Zealand. We Lose.
Yeah so for like 2, d. the marginal distribution of X would be
Pr(X=1)= 0.04 + 0.07 = 0.11
Pr(X=2) = 0.14 + 0.17 = 0.31
Pr(X=3) = 0.23 + 0.23 = 0.46
Pr(X=4) = 0.07 + 0.05 = 0.12
and i don't think there's any simpler way to calculate the coefficient of correlation- we have to get E(X), E(Y), Var(X) and Var(Y) with the super- long sum formulas... that we learnt at the beginning of the semester, with the table.
E(X) = sum (Pr(X=xi) . xi)
Var(X) = sum (xi- E(X))^2 . Pr(X=xi)
... and then do the same thing for Y...
and then you use the joint probability table, with the next formula, it takes ages
.
what971- get the mark berenson text book from last year to understand part3. it explains anova tables and everything. ch13... it should be in special reserve; if not on undergraduate shelf (i couldn't find it) 'basic business statistics'.
Pr(X=1)= 0.04 + 0.07 = 0.11
Pr(X=2) = 0.14 + 0.17 = 0.31
Pr(X=3) = 0.23 + 0.23 = 0.46
Pr(X=4) = 0.07 + 0.05 = 0.12
and i don't think there's any simpler way to calculate the coefficient of correlation- we have to get E(X), E(Y), Var(X) and Var(Y) with the super- long sum formulas... that we learnt at the beginning of the semester, with the table.
E(X) = sum (Pr(X=xi) . xi)
Var(X) = sum (xi- E(X))^2 . Pr(X=xi)
... and then do the same thing for Y...
and then you use the joint probability table, with the next formula, it takes ages
.what971- get the mark berenson text book from last year to understand part3. it explains anova tables and everything. ch13... it should be in special reserve; if not on undergraduate shelf (i couldn't find it) 'basic business statistics'.