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Stat 88 class - Shared screen with speaker view
isaacecheto
11:46
yes
DevenSS
11:49
yes
Claire MccCallick
11:50
yes
Claire MccCallick
16:15
CI is still slightly confusing, but overall okay
Joshua Kim
16:23
^
celinewherritt
16:32
^
YeJin Ahn
16:34
^
Andrew
16:47
point upward
Andrew
16:50
to previous comment
YeJin Ahn
17:02
agree with statement above
YeJin Ahn
19:07
just sigma not sigma^2 right..?
Shannon
19:09
Do you mean 68,000 +/- ...?
isaacecheto
19:11
^
Joshua Kim
19:37
Is it sigma or sigma^2?
Forrest Kim
23:23
ya
Andrew
23:27
:)
lucyzhang
24:24
We said the last black for warm up Q is 4000 in last lecture, is it 2000 instead?
lucyzhang
24:36
Blank*
lucyzhang
25:10
Ok thanks!
Alexandria Marx
28:43
because it's not skewed at all -- there's less variance ?
Michael Madden
28:55
when you average a bunch of ages there will be much less variance
Claire MccCallick
29:16
Because it is being divided by the population size
michellecan
31:14
Yes
Joshua Kim
31:14
yep
Michael Madden
31:17
yes!
Andrew
35:28
so if you have a bunch of samples and there's a 95% CI and you pick one sample what is the chance that that sample contains the true average
Andrew
36:30
ok great thank you
Andrew
37:07
yes
Claire MccCallick
37:07
Yes!
YeJin Ahn
37:11
:)
Joshua Kim
37:16
IN data 8 we say “fail to reject the null” instead of “accepting the null”. Are these the same? Is this a preference thing?
isaacecheto
37:17
yep
isaacecheto
37:20
:)
Joshua Kim
37:35
Cool
Forrest Kim
39:53
Does total area always = 1?
Forrest Kim
40:00
gracias
Alexandria Marx
45:54
should we review how to do integrals -- will we need to do them on the hws/quiz/final?
Joshua Kim
47:28
Wait so the derivative of the CDF equals what?
Joshua Kim
47:47
Cool thanks
isaacecheto
47:57
What exactly does density represent conceptually?
isaacecheto
48:08
ok
Dorkhan Chang
50:47
how did you find what "x" is in c/x^4
isaacecheto
52:14
3 * 50^3
Rebecca Hu
52:44
How did you get 1 - (50/x)^3
isaacecheto
53:08
The 50^3 cancels
isaacecheto
53:11
To be 1
isaacecheto
54:13
Don’t forget to multiply that by #*50^3
celinewherritt
54:18
Multiple that whole thing by 3*50^3
isaacecheto
54:18
3*50^3
celinewherritt
54:26
And distribute
Michael navruzyan
54:34
so what is the difference between the previous question and this question
YeJin Ahn
54:50
it should be 1 - (50^3/x^2)
lucyzhang
55:06
Where is 1- from again?
celinewherritt
55:33
1/3*50^3 cancels out with the 3*50^3 lucy
lucyzhang
55:47
Ohhh haha my b thx!
celinewherritt
01:00:54
Total area will be 1?
Joshua Kim
01:00:55
Its because the area under 0 is still 0
Lucy Sandoe
01:01:03
because it's a piecewise function
amywang
01:01:05
There’s only density in 0 to 1
Dorkhan Chang
01:01:28
will we always know what E(X) is so we can solve for the variance?
Claire MccCallick
01:01:33
Would the first term in Var(x) be (0.3)^2? Or can you explain why not if we are using that formula
Claire MccCallick
01:01:56
Nevermind
Claire MccCallick
01:02:05
I get it now
Claire MccCallick
01:02:07
yes
isaacecheto
01:03:28
Would it be a straight line between (0, 0) and (1, 1)
isaacecheto
01:03:35
And then a flat line past that
isaacecheto
01:04:14
ok
celinewherritt
01:04:21
I cant hear you?
Adam Lucas
01:04:40
can you hear me?
lucyzhang
01:04:42
Can’t hear u
Dorkhan Chang
01:04:42
no
Joshua Kim
01:04:43
Are you saying anything
Dingyue Z.
01:04:44
no
isaacecheto
01:04:44
nope
Jingyu Han
01:04:44
no
Lucy Sandoe
01:04:45
no
celinewherritt
01:04:46
no
YeJin Ahn
01:04:47
no
Marisol Trejos
01:04:48
no
Shannon
01:04:54
Professor, I can't hear you either
Adam Lucas
01:04:57
OK class is over. I will stay for OHs now
Lucy
01:04:57
no
Joshua Kim
01:05:15
Thanks!
isaacecheto
01:05:23
Ok thank you helped a lot!
Adam Lucas
01:06:04
can you hear me now?
Marisol Trejos
01:06:05
yes
ashley minooka
01:06:05
yes
Lucy
01:06:05
yes
Ishika Jain
01:06:06
yes
Adam Lucas
01:06:50
can you still hear me?
Tanvee Joshi
01:06:53
yes
lauraherron
01:06:54
yes
Adam Lucas
01:07:10
Any questions?
ashley minooka
01:07:15
What is the Variance of U