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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 30,323
09-30-2005, 09:44 AM
1. ### Transition matrix to compact set of rules?

Hello. Could you please point me to some methods of extracting a compact set of rules that describe a Markov chain, given that chain's (often very...

• Replies: 2
• Views: 1,262
02-17-2013, 07:16 AM
2. ### Negative Binomial Distribution

Hi, Regards

• Replies: 0
• Views: 1,580
10-12-2014, 08:54 AM
3. ### Given Joint Density Function

f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

• Replies: 5
• Views: 4,670
BGM
03-10-2011, 04:10 PM
4. ### Joint Probability Distribution

Joint Probability Distribution for Random Variable X and Y? Three cards are drawn without replacement from 12 face cards (Jacks, Queens, and Kings)...

• Replies: 3
• Views: 5,838
BGM
03-10-2011, 04:56 AM
5. ### Joint density function question

let X and Y be a continuous random variables having joint density function of f(x,y)=c(x^2 + y^2), 0<=x<=1, 0<=y<=1 1) Determine the constant c.

• Replies: 10
• Views: 4,000
03-09-2011, 04:52 PM
6. ### [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

• Replies: 1
• Views: 1,068
04-18-2017, 09:18 AM
7. ### Choice probability

I need to calculate the binary choice probabilty of 2 alternatives i and j- Each of the alternative is charectarised with a part of measurable and...

• Replies: 1
• Views: 2,431
BGM
08-31-2011, 11:59 AM
8. ### E(X) and Var(X) of pgf

Hi everybody, I have the following question that I have to answer. The pgf of a non-negative, integer-valued random variable X is given by ...

• Replies: 1
• Views: 3,156
05-22-2008, 05:22 AM
9. ### Probability and Moment Generating Functions

Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

• Replies: 5
• Views: 3,619
05-22-2008, 02:43 PM
10. ### Question Probability Marbles!!

There are 5 red marbles and 195 blue marbles. Marbles are drawn randomly with replacement. What is the smallest number of draws, (d) for which...

• Replies: 4
• Views: 2,784
04-29-2011, 03:17 PM
11. ### Expected Value - Help PLEASE!!!

How do you find E(1/X)? X is distributed binomially with probability p and n+1 terms: X~Binom(n+1, p). So E(X) = p(n+1), but how do I find E(1/X)?...

• Replies: 6
• Views: 1,741
BGM
11-02-2012, 02:21 PM
12. ### My professor and I disagree on a test's answer. would love to get a second opinion.

The question is as follows: " In a certain country: 10% of the families have no children 20% of the families have 1 child 30% of the families...

• Replies: 10
• Views: 1,891
02-25-2013, 01:01 PM
13. ### NEED HELP with Rayleigh distribution evercise!!

Hi all!! I have some doubts in this exercise. A RV X, has a rayleigh distribution if pdf takes the form fx(x) = x/theta (exp(-x^2/2theta)) where...

• Replies: 0
• Views: 1,928
11-21-2013, 09:34 AM
14. ### Is the Poisson probability distribution correctly applied to this problem?

THE PROBLEM The transport company XYZ owns delivery trucks traveling back and forth along 1,000 miles of roads within a state, subdivided into 10...

• Replies: 0
• Views: 923
01-07-2016, 03:12 AM
15. ### The famous cereal box prizes puzzle

One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

• Replies: 0
• Views: 4,454
10-01-2010, 02:33 AM
16. ### probability poisson distributed

hi can somebody help me with this question please.

• Replies: 5
• Views: 2,160
09-01-2014, 10:25 AM
17. ### Matching sets on Dice

For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

• Replies: 6
• Views: 5,080
01-25-2011, 01:05 AM
18. ### second order stochastic dominance for convex functions

Hi, To gain better understanding of second-order stochastic dominance I am trying to replicate some basic proofs. The proof of `standard' SSD...

• Replies: 1
• Views: 2,030
BGM
08-22-2014, 12:25 PM
19. ### Finding the max and min P-value from an F-tets

There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

• Replies: 7
• Views: 8,961
BGM
09-30-2011, 07:28 AM
20. ### help!

Suppose a population has a mean of 90 and a standard deviation of 28. If a random sample of size 49 is drawn from the population, the probability of...

• Replies: 2
• Views: 2,163
04-11-2013, 04:02 PM

Hi everyone, I joined the forum just to ask this question about one issue I'm having with probability. Your help is much appreciated. I already...

• Replies: 0
• Views: 2,416
11-01-2016, 09:21 PM
22. ### My article on runs testing random bit sequences

The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

• Replies: 0
• Views: 1,245
09-04-2014, 05:12 AM
23. ### Brain Teaser

It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

• Replies: 11
• Views: 3,258
09-08-2014, 11:43 PM
24. ### bizarre distributions

Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

• Replies: 0
• Views: 1,270
10-28-2014, 08:59 AM
25. ### My web pages on finding probabilites of runs

I now have several pages up on the topic. The starting page is: http://home.ptd.net/~artnpeg/RUNS.html I cover derivations of algorithms, js and...

• Replies: 0
• Views: 1,273
03-30-2015, 07:48 AM
26. ### My program TARGETS

I used a Monte Carlo method of finding probabilities of collisions between a randomly tossed circular block and non-overlapping randomly placed...

• Replies: 0
• Views: 809
06-03-2015, 02:42 PM
27. ### Probability Question..urgent

Can somebody help me by solving the below mentioned proble? A survey reports that 62% of callers to a help desk complain about the service if...

• Replies: 5
• Views: 3,509
08-27-2010, 10:00 AM
28. ### finding probabilty

Consider a country in which 100, 000 people vote in an election. There are only two candidates on the ballot; a Democratic candidate (denoted D) and...

• Replies: 3
• Views: 1,857
10-02-2013, 12:46 AM
29. ### Express similarity measure in terms of probability

Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of...

• Replies: 0
• Views: 1,342
04-15-2016, 05:58 PM
30. ### Necessary to check normality of definitively non-normal data sets?

hi, i'm working with data sets that are not normally distrubuted, and do not respond with normality to transformations (log, sqrt, z-score). they...

• Replies: 0
• Views: 2,334
10-08-2009, 12:33 PM
31. ### formula of parabola

Hi what is formula of parabola? thanks

• Replies: 1
• Views: 2,536
BGM
11-07-2011, 11:19 AM
32. ### maximum of parabola

Hi who determine maximum of parabola? thanks

• Replies: 5
• Views: 3,449
11-07-2011, 12:14 PM
33. ### maximum of function?

Hi who determine maximum of function? thanks

• Replies: 1
• Views: 2,534
11-07-2011, 11:36 AM
34. ### Mixed Poisson Distribution Help

Question: The number of accidents follows a Poisson distribution with mean 12. Each accident generates 1, 2 or 3 claimants with probabilities...

• Replies: 1
• Views: 1,166
02-25-2015, 02:12 PM
35. ### Poisson Distribution with two different expected value

Question: Suppose there are number of accidents at location A and location B each day with Poisson Distribution with rate 0.001 and the number of...

• Replies: 2
• Views: 1,493
02-26-2015, 07:38 AM
36. ### Normal Approximation to the Binomial Distribution

Hello everyone. So, I was trying to solve some exercises on the normal distribution and the approximation of Normal to Binomial but I just can't...

• Replies: 0
• Views: 1,405
04-05-2015, 04:30 PM
37. ### calculation of distance using Kullback–Leibler divergence

Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

• Replies: 2
• Views: 121,587
03-03-2011, 09:39 AM
38. ### Comparing Gaussian curves

Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

• Replies: 7
• Views: 9,158
08-31-2011, 05:35 PM
39. ### Probability Help

I'm having some trouble trying to figure this out: James is going to write an exam Suppose that if he hadn't passed in previous attempts, each...

• Replies: 3
• Views: 2,137
10-18-2013, 01:16 AM
40. ### Conditional distribution

Let X be a random variable. Given: -P(X = 1) = 1/2 -P(X = 2) = 1/2 -The conditional distribution of Y given X is an exponential with rate X. ...

• Replies: 1
• Views: 1,108
12-05-2013, 06:14 AM
41. ### Is this 2 sided or a 1 sided test

Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

• Replies: 2
• Views: 4,045
11-01-2008, 11:44 PM
42. ### goodness of fit , 1 sided or 2 sided?

Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

• Replies: 1
• Views: 3,476
11-02-2008, 11:24 AM
43. ### Gamma Difference Distribution

What is the distribution of the difference of two gamma distributions with same scale parameter, and shape parameter of the first one is k(1+e), e ->...

• Replies: 1
• Views: 4,470
BGM
09-19-2011, 10:43 AM
44. ### Triangular distribution

Hi all, I have a quick question and I hope you can address that. if I have two uniformly distributed variables x~ and y~ what would be the...

• Replies: 1
• Views: 1,183
BGM
08-08-2015, 02:41 AM
45. ### autoregressive

hi folks, i am using 2nd order autoregressive for prediction. my equation is y(t)=b1 + b2*y(t-1) + b3*y(t-2). i found the coefficients b1,...

• Replies: 3
• Views: 1,901
08-13-2008, 11:14 AM
46. ### conditional probability and trial of experiments

Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

• Replies: 2
• Views: 1,403
05-15-2013, 07:43 AM
47. ### probability density function

I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

• Replies: 0
• Views: 1,263
09-28-2014, 04:00 PM
48. ### Distribution

Hello, I having doubts on this issue 1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that γ <= B. Which...

• Replies: 10
• Views: 2,155
BGM
11-22-2014, 04:56 PM
49. ### Convergence

If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

• Replies: 12
• Views: 2,214
12-06-2014, 10:46 AM
50. ### Convergence in probability

If Z_n=\frac{1}{n}\sum_{i=1}^nX_i^2 and W_n=\frac{1}{n}\sum_{i=1}^n(X_i-\bar{X})^2 Show that V_n=Z_n - W_n \rightarrow^p \mu^2 What I think:...

• Replies: 6
• Views: 1,198
BGM
12-05-2014, 04:09 PM
51. ### Strong Law of Large Numbers

If X_n is a sequence of random variables and Cov(X_i,X_j)=0 for all i,j and Var(X_j)\leq c for all j. Show that X_n satisfies the strong law of large...

• Replies: 2
• Views: 1,575
12-06-2014, 10:46 AM
52. ### Markov Inequality

If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

• Replies: 6
• Views: 1,464
12-06-2014, 04:58 PM
53. ### Central Limit Theorem

If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

• Replies: 3
• Views: 1,799
12-08-2014, 06:25 AM
54. ### Convergence in Distribution

If X_n is a sequence of random variables independent and X_n is Binomial(n,p) with 0<p<1 and either T_n=\frac{X_n}{n} for all n 1) Show that...

• Replies: 3
• Views: 1,175
12-07-2014, 11:08 AM
55. ### Conditional density, bivariate normal

Let Z=X+Y where X \sim N(\mu,\sigma^2) and Y \sim N(0,1) are independent. What is the conditional density of X given Z, f_{X|Z}(x|z)? I already...

• Replies: 3
• Views: 1,363
06-10-2015, 05:51 AM
56. ### Book for stochastic processes

I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

• Replies: 4
• Views: 1,571
07-22-2015, 01:23 PM
57. ### Continuous joint entropy with fully dependent variable

Consider a variable X with a continuous uniform distribution in the interval and a variable Y that is fully dependent on X, i.e., p(Y=y |...

• Replies: 0
• Views: 1,258
04-11-2015, 04:59 PM

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