isaacecheto

09:08

yep

Ila Kanneboyina

09:10

yes

Adam Lucas

12:47

Any progress on the warmup?

Claire McCallick

16:09

yes!

chelsie park

16:13

yess

Stephen N

24:25

donuts* :)

YeJin Ahn

27:18

0

Kalia Rodich

27:19

0 ?

Ashley Minooka

27:22

mu?

chelsie park

27:22

0

Alex Xi

28:25

1

Jessica Ornowski

28:55

squared

Celine Wherritt

28:55

a^2

Carina Massana

28:56

squared

YeJin Ahn

29:55

1

Alex Xi

30:09

1？

Joshua Kim

30:33

Where did you get that x* = x-Mx/sigmax?

Celine Wherritt

30:37

1

Dorkhan Chang

32:15

why are we taking the expectation of (x* + y*)^2

Joshua Kim

32:26

Yeah that’s what I thought

amywang

32:54

Where did you get the formula for what (E(x*)^2) equals

lucyzhang

32:59

For E((x*)^2 why did we add var(x*) again?

amywang

33:36

Yes got it thank you!

lucyzhang

33:50

That answered my Q !

Matthew Simon

34:00

Why is sigma a constant but not mu?

Dorkhan Chang

35:25

how do we know r= E(x*y*)?

Matthew Simon

36:21

Yes

Matthew Simon

36:23

Thank you

Dorkhan Chang

37:00

ah ok thanks

Stephen N

45:51

why do you gravitate between mu vs. E(X) & sigma vs. SD(X)?

Stephen N

45:57

does notation matter?

Stephen N

47:17

I see that makes sense!

alvin

47:49

no

alvin

48:28

oh it was the thing from earlier

alvin

48:42

yeah I get it thanks

Vasanth Kumar

50:34

rx + (mu_y) - r(mu_x)

Claire McCallick

50:49

Y hat= a hat + b hat?

Vasanth Kumar

52:20

0

Vasanth Kumar

52:28

0

Jesse Thiara

52:42

1

Alex Xi

52:45

1

Alex Xi

52:47

1

Jessica Ornowski

52:59

r

Ashley Minooka

59:40

is 0.64 just y in standard units then?

Alex Xi

01:01:45

1/r?

lucyzhang

01:05:18

Why did u flip back x and y star at the end for last problem?

Claire McCallick

01:06:05

Thanks!

Ronan Figueroa

01:06:07

thanks

Joshua Kim

01:06:08

thanks

YeJin Ahn

01:06:12

Thank you!

Alex Xi

01:06:13

thank you

mayareuven

01:06:14

Thank you!

Jingyu Han

01:06:15

Thank you!

Tanvee Joshi

01:06:15

thank you!

nicki <3

01:06:20

THANK YOU

nicki <3

01:06:22

SO MUCH!

Esha Paruchuri

01:06:23

What chapters does the quiz cover again?

amywang

01:06:33

Logically, why is the percentile rank of X not 90th percentile again

isaacecheto

01:06:40

What is percentile rank conceptually?

amywang

01:09:26

Yes

amywang

01:11:21

Yes thank you!

isaacecheto

01:11:39

How is it different just from percentile

isaacecheto

01:12:07

Oh ok

isaacecheto

01:12:09

I see

isaacecheto

01:12:15

THanks!