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