isaacecheto

12:17

yes

Jingyu Han

12:17

yes

Rebecca Hu

12:17

yes

chelsie park

12:18

yes

Zachary Zhu

12:19

Yes

ireneyoon

14:32

What is the password for the recorded lecture (lec 32 from monday)?

celinewherritt

14:47

^^^

ireneyoon

15:20

Ok got it thank you!

ireneyoon

16:53

Sure

ireneyoon

17:04

Its working now

alvin

18:04

np

YeJin Ahn

18:11

p

Rebecca Hu

18:30

Why is it normal?

YeJin Ahn

18:30

pq

isaacecheto

18:32

pq

YeJin Ahn

18:48

pq/n

lauraherron

18:59

sqrtn *p

Dorkhan Chang

20:50

is pq/n always the variance for sample means

Rebecca Hu

20:54

How do we know the distribution is normal

Rebecca Hu

21:41

Both

Rebecca Hu

22:16

Yes thank you!

YeJin Ahn

26:44

why is it (1/2)/2 again?

Jooee Karwande

26:46

Can you explain how we got 1/4 again?

isaacecheto

27:11

This is based off the density chart right?

Jooee Karwande

27:50

i see thank you!

Joshua Kim

34:41

what is the advantage of making a one sided alternative hypothesis?

Kalia Rodich

36:02

What is the difference between the 1-phi and inverse phi functions?

Joshua Kim

36:50

That sounds good

Joshua Kim

37:10

Just one more follow up: does it matter if you do Px < Py? Or no?

Kaci Gu

37:17

is it normally the case that when the question asks if two proportions are the same, we can choose an one-sided alternative for simplicity’s sake

Kalia Rodich

37:56

Amazing than you

Kalia Rodich

37:57

thank*

Joshua Kim

39:06

Ah gotcha

Kaci Gu

40:24

Thank you

isaacecheto

42:27

Would it not be (.2)(.8)/200?

isaacecheto

42:31

In the SD

Dorkhan Chang

42:36

is it 30% in null because of the difference in proportions?

Ashley Minooka

42:58

^

Michael Madden

43:15

what is the hypothesis

isaacecheto

43:17

ok

Rebecca Hu

43:49

So we are finding the SD of the observed data not under the null?

Ashley Minooka

43:49

on the top, is it 0.5*0.5/300

YeJin Ahn

43:49

wouldn’t it be 0.5*0.5 for sd of sample A

isaacecheto

44:05

^oh yea that too

celinewherritt

44:11

Same question^

Jooee Karwande

44:16

^

Jooee Karwande

44:17

+1

isaacecheto

44:44

ohh

isaacecheto

48:22

On a quiz would it be able to go straight to that answer because of the cdf formula

Dorkhan Chang

48:24

can you just use the cdf formula: 1-e^-lambda(t)

isaacecheto

48:40

^

isaacecheto

49:13

nope

isaacecheto

49:17

All good thanks

Noah Wadhwani

54:02

Are we assuming the circuit only needs 1 of 2 components to work?

Alex Xi

54:06

what is little t?

Jooee Karwande

55:08

Why don’t you use the survival function here ?

isaacecheto

56:08

Because it’s P(T<t)

alvin

56:15

why do both have to be less than t if you only need one for the circuit to work?

isaacecheto

56:15

Survival would have been for T>t

Jooee Karwande

56:26

ohh yeah my bad

YeJin Ahn

57:38

ad

celinewherritt

57:47

ad

Sophie

57:49

a,d

Ashley Minooka

58:01

a, d

Ashley Minooka

01:01:48

0

Rebecca Hu

01:01:57

Is e(t) the mean

Jooee Karwande

01:02:04

0?

Forrest Kim

01:03:20

Variance?

Kaci Gu

01:03:22

mse

Alex Xi

01:07:49

0

Ashley Minooka

01:07:49

0

Forrest Kim

01:07:49

0

alvin

01:07:50

0

isaacecheto

01:08:00

var

Ashley Minooka

01:08:02

var t

Alex Xi

01:08:26

thank you!

Forrest Kim

01:08:27

Thanks

YeJin Ahn

01:08:29

Thank you!!

Ashley Minooka

01:08:30

thank you!

Ronan Figueroa

01:08:31

thank you

mayareuven

01:08:34

Thank you!

isaacecheto

01:08:35

Thank you!

Jingyu Han

01:08:35

Thank you

Joshua Kim

01:08:42

What’s theta again? I forgot to write it down

Joshua Kim

01:09:15

cool

Michael navruzyan

01:09:21

kind of confused on the hypothesis test we did for difference in proportions, shouldn't the null be that the difference in proportions is 0, not 30%

Joshua Kim

01:10:12

Are you talking about 10.5.7?

Michael navruzyan

01:10:22

ya

Joshua Kim

01:10:27

Gotcha

Matthew Simon

01:12:21

Can you clarify that on the notes by chance?

Joshua Kim

01:12:36

^