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Stat 88 class - Shared screen with speaker view
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
^