ECMT quiz 2 (6 Viewers)

[stazi]

egads, grace was right.
i think she hangs around these threads because she misses ecmt

 

[absolution*]

The covariance is given to you in the question: cov (x, y) = -10

suckness.

can someone post the answers to the questions i posted above...

lainee... im looking at you

 

[stazi]

3a. 0.0019
3c. (may be wrong) 0.0062
3.i (done already on this thread)
3j. 3.01(+/-)2.779(0.00385)

 

[absolution*]

what about 3 l) and 2 d)

 

[stazi]

didnt get l)
2d) is just the difference in
o/sqrt n
between the two samples.

 

[absolution*]

so whats the answer for 2 d)?

 

[sarevok]

i think 1time4theppl's answer is correct...mean would be u(x-bar) = u...standard deviation of o/sqrt(n)

 

[absolution*]

i dont get it

 

[kow_dude]

How is 3 (h) possible?!? The sample deviation nor the population standard deviation is given !!

 

[stazi]

kow dude - think proportions.

 

[ToO LaZy ^*]

so whats the answer for 2 d)?

n=20
1.12

n=50
0.71

 

[ToO LaZy ^*]

Why is the covariance a minus?

I have a few additional questions..

What answers did people get for 3. a) c) i) j)
How do you do 2 d) and 3 l)

cheers

3a. 0.0062
c. 62
i. 129.49,126.51
l. 3.0207,2.9993