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!