2008 First Semester STATS课程官方问答贴

z-score

原帖由 apricotnz 于 2008-4-8 14:14 发表



why 5 choose 1?? why order doesn'r matter here??


p.s. when u gonna answer my 341

我是这样想的: IP(4H1T)可以有以下的排列组合:

T H H H H
H T H H H
H H T H H
H H H T H
H H H H T

所以是5C1.

341我现在就看。

z-score

原帖由 apricotnz 于 2008-4-8 14:14 发表



why 5 choose 1?? why order doesn'r matter here??


p.s. when u gonna answer my 341

看完了，我觉得挺make sense的。

apricotnz

原帖由 z-score 于 2008-4-8 14:50 发表


看完了，我觉得挺make sense的。

are you sure my answer can get full mark???  I think it's a stupid question that I have no idea how to answer.

z-score

原帖由 apricotnz 于 2008-4-8 14:54 发表



are you sure my answer can get full mark???  I think it's a stupid question that I have no idea how to answer.

I can't guarantee you can get full marks. I agree with you, 安德鲁's part of the course is stupid and it's pointless really. But how he marks the assignment can be quite subjective and it is all up to him no matter what I think.

spirithell

STAT101 Assignment2

why nobody ask Question1? It's so simple or i AM sily?

I always confused with this kind of questions.

My Answer for (a)---(e), it's not the final answer. Please help  me check my point!

(a) 118300/376700
(b) 604100/1981200
(c) 604100/3107900
(d) 604100/944000
(e) 604100/3107900  ???

  something wrong with my literature logic.

luvwei

i thot e would be the same as b

NOT C..

LET ME CHECKK..



B) 604100/1981200
C)944000/3107900
E)604100/1981200

THOSE ARE MY ANSWERS THAT DIFFERENT TO URS.

NOT SAYING IM 100% RIGHT.

z-score

原帖由 BlackDatura 于 2008-4-8 21:35 发表
IP(T1 | 4H1T) = IP(T1 & 4H1T) / IP(4H1T) = (1-p)*p^4 / (5C1 * p^4 * (1-p)^4) = 0.2

- -!!ATM..是不是打错了..如果照这个算得话...答案不等于0.2呀

打错了，打错了，不好意思。

应该是(1-p)*p^4 / (5C1 * p^4 * (1-p)) = 0.2

z-score

明天早上等我头脑清醒的时候帮你们搞定第一题。

apric0tnz

早上好啊~~~~昨天我去assistant rm, 两个没用的tutor浪费了我半天时间，看着答案将都不会讲~！真是气死我了~~~~一个洋人，一个old fat岛人~~~~


anyway~~~我有210的问题想请教你


他们的evidence against null和我们stage one学得不太一样，他们没有那个什么scale的东西，比如书里有道例题，P=0.02XXX她说是SOME EVIDENCE AGAINST.


所以我想问怎么来衡量呢？这个ASSIGNMENT 4个P-VALUE,


3
(c) 0.002955449

I say it's strong evidence aginst

4(d) 0.850554
I say no evidence against


5(c) 0.05825268
i say some evidence against, but reject at 5% level


(d) 0.000008531077
i say strong evidence against


对么？？？？谢谢老师~~~~

apric0tnz

原帖由 303B25 于 2008-4-9 10:48 发表
5 (c) I said little or no evidence against

(d) I said extremely strong evidence against.

I hate the stats assistance room, most of the tutors there are not very helpful.

BTW are you that ...

表这么形容我……………………


你是哪位啊？？？？男人女人？？？

apric0tnz

amazing that you can't read chinese but still can get in to skykiwi bbs.


I am the rep for 210, and I'll take hot as a compliment. Why pretty stuff in my hair~~~??? haha....
I am always late to class though.


BTW who are you? male or female?

apric0tnz

thanks for that kind offer


will keep in touch on discussing 210.

apric0tnz

i don't have 210 stuff with me. But there si a tiny paragraph says about sample variability right before me get into likelihood topic. It says something like small sample then variability too small to detect anything. and big sample variability big enough for us the detect difference.

apric0tnz

I've got one too. When they ask you to interpret in terms of evidence against and strength of evidence. Do you just write two sentences to answer what they asked?


Do we need to write the stuff like on the coursebook, something like when H0 is true, things as extreme as xxxxxx will occur xx% of the time.

apric0tnz

THANK YOU, JUST BY READING IT, IT'S LIKE ROUND AND ROUND AND ROUND,saying the same thing in different ways, really don't know whats the point.

luvwei

atm
清醒了没有阿。？？

应该在吃chips吧？？？

z-score

原帖由 spirithell 于 2008-4-8 16:52 发表
STAT101 Assignment2

why nobody ask Question1? It's so simple or i AM sily?

I always confused with this kind of questions.

My Answer for (a)---(e), it's not the final answe ...

原帖由 luvwei 于 2008-4-8 18:02 发表
i thot e would be the same as b

NOT C..

LET ME CHECKK..



B) 604100/1981200
C)944000/3107900
E)604100/1981200

THOSE ARE MY ANSWERS THAT DIFFERENT TO URS.

NOT SAY ...

原帖由 luvwei 于 2008-4-9 13:34 发表
atm
清醒了没有阿。？？

应该在吃chips吧？？？

不好意思大家, 阿童木来了. 今天吃的是wedges.

(a) 118300 / 376700
(b) 604100 / 1981200
(c) 604100 / 3107900
(d) 604100 / 944000
(d) 604100 / 1981200

z-score

原帖由 apric0tnz 于 2008-4-9 10:23 发表
早上好啊~~~~昨天我去assistant rm, 两个没用的tutor浪费了我半天时间，看着答案将都不会讲~！真是气死我了~~~~一个洋人，一个old fat岛人~~~~


anyway~~~我有210的问题想请教你


他们的evidence again ...

原帖由 303B25 于 2008-4-9 10:48 发表
5 (c) I said little or no evidence against

(d) I said extremely strong evidence against.

I hate the stats assistance room, most of the tutors there are not very helpful.

BTW are you that ...

嗯, stats assistance room的质量我就不多说的, 考试能拿高分的不一定会给同学们讲题.

我觉得c说some to weak evidence也没有问题.

chocolover

原帖由 z-score 于 2008-4-9 14:09 发表






不好意思大家, 阿童木来了. 今天吃的是wedges.

(a) 118300 / 376700
(b) 604100 / 1981200
(c) 604100 / 3107900
(d) 604100 / 944000
(d) 604100 / 1981200

请问 为什麼B & E算法是一样呢? 感觉好多陷阱 有没有什麼方法比较好分辨?? 英文不好都会出错 ><

z-score

原帖由 chocolover 于 2008-4-9 23:57 发表




请问 为什麼B & E算法是一样呢? 感觉好多陷阱 有没有什麼方法比较好分辨?? 英文不好都会出错 >

嗯, B和E的确是一样的. Probability问题的陷阱不少, 不过多做题就能找出规律.

luvwei

atm 帮忙看看101的第7题。

不太懂阿～～～

z-score

原帖由 luvwei 于 2008-4-10 10:12 发表
atm 帮忙看看101的第7题。

不太懂阿～～～

第七题? 不是一共6道题吗?