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Stat 88 class - Shared screen with speaker view
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!