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Stat 88 class - Shared screen with speaker view
Joshua Kim
01:58
I like your background Prof. Lucas
Adam Lucas
02:44
I live in SF :>
Dorkhan Chang
03:07
Is the regression lab done during discussion time?
Adam Lucas
03:26
I assume yes
Andrew
04:41
Will there be review sessions during rrr week
Adam Lucas
05:09
You need to show that r=0
Adam Lucas
05:46
(-1,1),(0,0),(1,1)
Adam Lucas
06:38
Show that E(DxDy)=0 where Dx is x-mean(x)
isaacecheto
10:22
yep
YeJin Ahn
10:25
yes
Joshua Kim
10:25
yep
Jingyu Han
10:26
yes
Celine Wherritt
14:52
Could u also have taken the uniform expectation a + b /2
Celine Wherritt
14:53
?
Dorkhan Chang
14:54
where did you get the 1/3 on the outside of the brackets again
Celine Wherritt
15:12
So -1 + 1 /2
YeJin Ahn
15:12
Why is y bar = 2/3?
alvin
16:02
why did you choose those 3 points?
Celine Wherritt
16:08
Yes thanks
Dorkhan Chang
16:31
yes
Joshua Kim
16:37
How did you get x and y bar
Matthew Simon
18:48
For the point (0,0), how did you get D sub y to be 0? Should it not be 2/3
Sophie
18:48
Why is the middle term (0)(0) instead of (0)(0- 2/3)
alvin
18:50
got it
Joshua Kim
19:27
Ah gotcha
YeJin Ahn
19:27
Why are we not using the formula of expectation for uniform distribution?
Dorkhan Chang
21:29
so the middle part is just: the x-xbar times y-ybar, for all three points?
YeJin Ahn
21:42
Yes thank you!
YeJin Ahn
22:26
no
isaacecheto
22:32
no
Jingyu Han
22:32
no
Sophie
22:34
not necessarily
Claire McCallick
22:39
no
Claire McCallick
25:47
Do these traits with the residual only work on a football shaped scatter plot?
Claire McCallick
26:24
Okay thanks!
Adam Lucas
33:01
You are taking the expectation of the mean. You need to look at the expectation of Yi
Dorkhan Chang
35:52
how do we know E(ei) is 0 again?
Claire McCallick
36:21
There is one question in the chat
isaacecheto
36:23
Because it has dist N(0, sigma^2)
Dorkhan Chang
37:03
yep thanks
Dingyue Z.
54:44
what is T again?
Dingyue Z.
55:48
yes
isaacecheto
57:41
The null is that x and y are uncorrelated right?
isaacecheto
58:00
ok
YeJin Ahn
58:20
Thank you professor!
Jingyu Han
58:21
Thank you!
isaacecheto
58:33
Thank you!
Devang Patel
58:38
Hey professor, do you know when the grade update will be released
Devang Patel
58:53
Yup
Devang Patel
59:17
Awesome, thank you so much!