In probability theory and statistics, the binomial distribution with parameters n and p is the discrete probability distribution of the number of successes in a sequence of n independent experiments, each asking a yes–no question, and each with its own Boolean-valued outcome: success (with probability p) or failure (with probability q = 1 − p). A single success/failure experiment is also called a Bernoulli trial or Bernoulli experiment, and a sequence of outcomes is called a Bernoulli process; for a single trial, i.e., n = 1, the binomial distribution is a Bernoulli distribution. The binomial distribution is the basis for the popular binomial test of statistical significance.
The binomial distribution is frequently used to model the number of successes in a sample of size n drawn with replacement from a population of size N. If the sampling is carried out without replacement, the draws are not independent and so the resulting distribution is a hypergeometric distribution, not a binomial one. However, for N much larger than n, the binomial distribution remains a good approximation, and is widely used.
Homework Statement
Find the minor value of the natural number n such that \left (\frac{\sqrt{3}}{2} + \frac{1}{2}i \right )^{n} be a real positive number.
EDIT: n must not be 0.
Homework Equations
Considering the binomial theorem as:
{\left(x+y\right)}^n=\sum_{k=0}^n{n \choose...
From the central limit theorem the binomial distribution can be approximated by a normal distribution N(0,1). But the binomial distribution can also be approximated by a poisson distribition.
Does this mean there is a relationship between the normal distribution and the poisson distribution...
One of the questions in my probability homework reads:
X denotes a negative binomial random variable, with p = 0.6 Find P(X ≥ 3) for a) r = 2 and b) r = 4.
According to my teacher, the answers are 0.1792 and 0.45568, respectively, but I can't for the life of me figure out how he got them...
Hi, I'm using a website (http://stattrek.com/Tables/Binomial.aspx) to calculate binomial probability, and I cannot understand it's output.
Consider:
1.13860032513458E-11
Does this mean 1.13860032513458^[e*(-11)]
Thanks
Homework Statement
Show that: (\stackrel{n}{k})=\#\left\{(\omega_{1},..., \omega_{n})\in\left\{0,1\right\}^{n}:\Sigma^{n}_{l=1}\omega_{l}=k\right\}
(edit: the sigma is meant to go from l=1 to n)
Homework Equations
It says to use this...
Homework Statement
Calculate \sqrt{1/20} using the extended binomial theormem. (a precision of k=4 is enough)
The Attempt at a Solution
\sqrt{1/20}= (1 + (-19/20) )^{1/2}= \sum( choose (1/2,k)*(-19/20)^k) = 1- 1/2*19/20-1/8*361/400+1/16*6589/8000 = 0.72... is wrong.
Homework...
Homework Statement
Express cos^4Θ.sinΘ in the form asinΘ+bsin3Θ+csin5Θ
Homework Equations
cosrΘ = 1/2(z^r + z^-r)
sinrΘ = 1/2i(z^r - z^-r)
The Attempt at a Solution
So far I think I have this.
32i(sinΘ)(cos^4Θ) = (z-z^-1)(z+z^-1)^4
I am unsure how to multiply and manipulate...
Homework Statement
Find the term in the expansion of (x-(2/x^2))^14 which is of the form constant/x.
The Attempt at a Solution
I have worked out the general expression. (14|r) x^14-r * (-2/x^2)^r
However I can only work out this problem by trial and error. I know that in this case...
Homework Statement
Show that for all integers n,m where 0 ≤ m ≤ n
The sum from k=m to n of {(nCk)*(kCm)} = (nCm)*2^(n-m)
The Attempt at a Solution
So for the proof, I have to use a real example, such as choosing committees, binary sequences, giving fruit to kids, etc. I have been...
Homework Statement
(Give a combinatorial proof of each of the following identities. In other words, describe a collection of combinatorial objects and then explain two different methods for counting those objects. Leave each identity in the form given. Do not rearrange terms or use any other...
Homework Statement
For fixed n, are there values of p (0≤p≤1) for which V(X) = 0? Explain why this is so.
The Attempt at a Solution
For X~Bin(n,p), V(X)=np(1-p). So the only solutions for this equation are when p=0 or p=1. There are too many variables for me to keep track of and...
Homework Statement
The College Board reports that 2% of the 2 million high school students who take the SAT each year receive special accommodations because of documented disabilities. Consider a random sample of 25 students who have recently taken the test.
a.) What is the probability...
Homework Statement
The rejection rate of a certain journal is 45%. If the journal accepts articles at random, what is the minimum number of articles someone has to submit to have a probability of more than 0.75 of getting at least one article accepted?
Homework Equations
I'm almost sure...
Homework Statement
I am trying to find the limits of integration (upper and lower) of a known value of the binomial probability distribution. In other words, I know what the integral (area under the prob. dist.) needs to be (0.84 and 0.16), but how can I code a function (say into MATLAB) that...
hi there I am abit stuck here. i got a q saying :
in binomial expansion of (3-2/x)^9 find the 5th term using the general term of the binomial expansion and check your answer
(3-2/x)^9
used formula
=N!/(n-r)!r! * A^(n-r) * b ^ r
r= 4
a= 3
b= - 2/x
n=9
got a answer of -489888/x^4
How do i...
Suppose n is even, prove:
\sumk=0->n/2, C(n,2k)=2^(n-1)=\sumk=1->n/2, C(n,2k-1)
Give a combinatorial argument to prove that: (I've figured out this one...)
\sumk=1->n, C(n,k)^2=C(2n,n)
For the first problem, I tried to break C(n, 2k) into C(n+1,2k)-C(n, 2k-1), but they didnt seem to work very...
Homework Statement
Consider a Negative Binomial random variable Y ~ NB(r, p). Show (from first principles!) that E[Y] is r/p. Why does this imply Y is proper?
Homework Equations
I have no idea how to use latex, so this may be messy:
pmf of Y: [ (k+r-1)! / k!(r-1)! ] * (1-p)^r * p^k...
I have this question and its a combination of the binomial theorem and nilpotent elements within a ring.
Suppose the following, am=bn=0. Is it necessarily true that (a+b)m+n is nilpotent.
For this question I did the following:
\sumi=0m+n\binom{m+n}{i}am+n-ibi
If i=m, then a=0...
A text file contains 1000 characters. When the file is sent by email from one machine to another, each character (independent of other characters) has probability 0.001 of being corrupted. Use a poisson random variable to estimate the probability that the file is transferred with no errors...
Homework Statement
An opaque bag contains 10 green counters, and 20 red ones. One counter is drawn at random and not replaced: green scores one, red scores zero. Five counters are drawn.
Find the probability of scoring 0, 1, 2, 3, 4, 5 points.
Homework Equations
The Attempt at...
Could anyone help me on this question? Is it true that
\sum_{k=n+1}^{2n}\left(\begin{array}{c}
2n\\k\end{array}\right)x^{k}\left(1-x\right)^{2n-k}\leq2x
for any x\in(0,1) and any positive integer n?
Any help on that will be greatly appreciated!
Hey guys,
I've been reading up on binomial coefficients and I have found a brief section on n choose r. I understand vaguely what it actually is, however in my textbook there is a step by step proof of how we show that:
( \stackrel{n}{r} ) = \frac{n!}{r!(n-r)!}
I can follow where...
Homework Statement
. Peter and Paul bet one dollar each on each game. Each is willing
to allow the other unlimited credit. Use a calculator to make a
table showing, to four decimal places, for each of p = 1/10, 1/3,
.49, .499, .501, .51, 2/3, 9/10 the probabilities that Peter is...
Homework Statement
Now you and your fiend play a different game. You flip your coin until it comes up heads the first time. Let X denote the number of flips needed. Your friend rolls its die until it comes up "3" or "5". The first try let Y denote the number of rolls needed. Assume X and Y are...
Homework Statement
A drug company markets a medication that cures about 60% of cases with depression. A CB program is thought to be more effective. It was delivered to 15 depressed people. Determine the minimum number of cured people required to support the claim that the CB program is more...
Homework Statement
Let X be the number of 1's and Y be the number of 2's that occur in n rolls of a fair die. Find Cov(X, Y)
Homework Equations
Cov(X,Y) = E(XY) - E(X)E(Y)
The Attempt at a Solution
Both X and Y are binomial with parameters n and 1/6. Thus it is easy to find E(X)...
Homework Statement
prove that (\stackrel{2n}{n}) is even when n \geq1
Homework Equations
as a hint they gave me this identity:
\stackrel{n}{k}= (n/k)(\stackrel{n-1}{k-1})
The Attempt at a Solution
by using that identity i got:
(\stackrel{2n}{n}) = (2n/n)...
Homework Statement
Determine the coefficient of p4q7 in the expansion of (2p-q)(p+q)10Homework Equations
The Attempt at a Solution
sry, i can't attempt to solve this coz i don't even know how to expand this using formula
Homework Statement
\mbox{Prove or give a counterexample: If p is a prime integer, then for all integers x and y, } (x+p)^p \equiv_p x^p+y^p.
Homework Equations
\equiv_p \mbox{just means (mod p).
Can you please check and see if this proof is well-formed?}
The Attempt at a Solution...
Homework Statement
Let X and Y be independent binomial random variables with parameters n and p.
Find the PMF of X+Y.
Find the conditional PMF of X given that X+Y=m.
Homework Equations
The PMF of X is P(X=k)=(n C k)pk(1-p)n-k
The PMF for Y would be the same.
The Attempt at a...
Let X be a Binomial B(\frac{1}{2},n), where n=2m.
Let a(m,k) = \frac{4^m}{(\stackrel{2m}{m})}P(X = m + k).
Show that lim_{m->\infty}(a(m,k))^2 = e^{-k^2}.
So far, I've found that P(X = m+k) = (\stackrel{2m}{m+k}) \frac{1}{4^m}
Then, a(m,k)=\frac{m!m!}{(m+k)!(m-k)!}.
But I have no...
Here is the problem i am having trouble:
Expressing the binomial coefficients in terms of factorials and simplifying algebraically show that
(n over r) = (n-2+1)/r (n over r-1)
i got that equals ((n-r+1)/r) ((n!)/((r-1)!(n-(r-1))!)) but i am trying to get that to equal n!/r!(n-r)! which...
Hi,
just started learning probability & need some help in understanding...
"The binomial random variable X associated with a binomial experiment consisting of n trials is defined as
X = the number of S's among the n trials.
Suppose, for example, that n = 3. Then there are 8 possible...
Dear Reader,
I am writing for information, or a point towards any information about the calculation on the uncertainty on the number of trials in a binomial distribution. I had been using the SQRT(N) (taken from poisson dist. I miss them) but forgot they are binomial. For example if I toss a...
[b]1. Let the p.m.f. pf M be defined by f(m)=x/8, x=1,3,4. What is the mean of M?
[b]2. n!/n-r*p^n*(1-p)^n-r
[b]3. 3!*1/3^3*2/3^2=.59 This is not the correct answer!
Hi, I'd like to know how to find the uncertainty of a function that has two binomial distribution s, something like
Signal = N(yes) - N(no)
Set p = 0.6 for yes. My problem is that I do not know how to find the uncertainty for N(yes) and N(no), and do not know how to find the uncertainty...
I know how to derive the binomial approximation for (1+\alpha x)^{\gamma} using a Mellin transform, but for (1-\alpha x)^{\gamma} the method appears to fail because I can't take x to infinity.
Here is the basics of the method. Take the Mellin transform of (1+\alpha x)^{\gamma}:
M(p) =...
Homework Statement
Homework Equations
Formula => C(n,r) or nCr =n!/r!(n-r)! & the basic Binomial Theorem formula.
*Answer mentioned in book = nx
The Attempt at a Solution
The LHS should be (x+y)n & the given question is its expansion only if that 'r' is not multiplied in the question. I...
Homework Statement
A third degree polynomial has 3 roots that, when arranged in ascending order, form an arithmetic progression in which the sum of the 3 roots equal 9/5.
The difference between the square of the greatest root and the smallest root is 24/5
Given that the coefficient of the...
When using a binomial series to expand 1/\sqrt{1-x^{2}} I come up with the correct answer except that I do not add the number one to my answer. Why do I have to add one to the series, should this not arise when calculating the sum?
Homework Statement
Suppose that the conditional distribution of X given that N = n is binomial (n, 1/2) and the distribution of N is uniform over {2,4,6}
a) Determine P(X=2, N = 4)
b) Determine P(X=1)
c) Determine P(N = 4| X =1)
Homework Equations
The Attempt at a Solution...
Homework Statement
Let X be a binomial random variable representing the number of successes in n independent Bernoulli trials. Let Y be the number of successes in the first m trials, where m < n . Find the conditional probability distribution of Y given X=x.
Homework Equations
The...
Firstly, I want to note I'm a post college student who is attempting to teach himself calculus. I'm reading Calculus Made Easy by Silvanus P. Thompson and Martin Gardner, St. Martin's Press, 1998 ed.
My question comes from page 56 Case of a Negative Exponent
y + dy= (x + dx)^-2...
Hello,
All we know the Binomial Theorm which may be stated mathematically as:
\left(x+y\right)^n=\sum_{k=0}^n{n\choose k}y^k\,x^{n-k}
Now suppose that we have the following mathematical expression:
\sum_{k=0}^{n}{n\choose k}\,(-1)^k
if we substitute x=1 and y=-1 in the first...
Hello!
Is there a closed form expression or a good estimate for the probability that a binomial distribution yield the average np or less. Basically I'm asking for a good way to evaluate
P=\sum_{k=0}^{np} \begin{pmatrix} n\\ k
\end{pmatrix} p^k(1-p)^{n-k}
I just figured that for the...
use the binomial theorem to determine the coefficient of x^33 in the expansion of (\frac{1}{4}-2x^3)^17
ive played around with it and come up with 33^C_17
as a coefficient.am i right in saying that is all the question asks
Homework Equations
The Attempt at a Solution
Hi Friends Please Solve my problem
Please TEll Properly
dq = Surface Charge
da = Surface Area
Radius of ring = w
Total Radius = R
qo = Point Charge
Distance from Center of Ring to Point Charge = Z
I want to know how I ca apply binomial theorem to solve the equation
If
Z = 0...