首页 | 学习中心 | 注册 登录
返回列表 发帖
YouCanDoIt

Rank: 2

UID
223220 
帖子
221 
主题
170 
注册时间
2011-7-11 
最后登录
2016-4-19 
1# 跳转到 » 倒序看帖
打印
tT
发表于 2013-5-7 02:33 | 只看该作者

Q:random variable that follows binomial distribution

possible, property, following
Schweser Questionbank ID- #1479
Which of the following could be the set of all possible outcomes for a random variable that follows a binomial distribution?
A) (-1, 0, 1).
B) (0, 0.5, 1, 1.5, 2, 2.5, 3).
C) (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11).
D) (1, 2).
The correct answer was C)
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11).
This reflects a basic property of binomial outcomes. They take on whole number values that must start at zero up to the upper limit n. The upper limit in this case is 11.
This question tested from Session 3, Reading 9, LOS d, (Part 2)
anyone can explain this?
收藏 分享

karoliukas

UID
223228 
帖子
675 
主题
151 
注册时间
2011-7-11 
最后登录
2016-5-11 
2#
发表于 2013-5-7 02:37 | 只看该作者
I am too not able to understand this. I remember doing it wrong too.

TOP

mouse123

UID
223230 
帖子
549 
主题
152 
注册时间
2011-7-11 
最后登录
2016-4-21 
3#
发表于 2013-5-7 02:41 | 只看该作者
The binomial distribution is a probablillity distribution of number of successes for a given number of trials.
Each trial can either result in failure (value=0) or success (value =1).
You can think of it as a coin toss, each time you toss the coin you can either win (1) or loss (0).
If you were to list possible outcomes it would then always be greater then 0. (you can’t win -1 coin tosses!)
And the number have to descrete, ie you can’t win 1.5 coin tosses.
The distribution must always start at zero. This makes sense as if you were listing all the possible outcome that could happen. The least number of wins will always be zero.
C is the only answer that does not brake any of these “rules”

TOP

svgleeson

Rank: 2

UID
223348 
帖子
250 
主题
63 
注册时间
2011-7-11 
最后登录
2013-8-22 
4#
发表于 2013-5-7 02:45 | 只看该作者
I see, it is asking all possible outcomes for a binomial distribution
random variable . like toss coin 11 times, you may get 0 time tail, or 1, or 2….or 11 times.
tks!

TOP

DarienHacker

Rank: 2

UID
222260 
帖子
279 
主题
75 
注册时间
2011-7-2 
最后登录
2014-6-29 
5#
发表于 2013-5-7 02:48 | 只看该作者
Yes. This question is horribly worded. Keyword is distribution.

TOP

返回列表