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Forum: Probability

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

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,234
    09-30-2005, 09:44 AM Go to last post
  1. Probability and quality control

    Hi all, I am simulating a process in Arena software. One part of the process has a delay of a normal distribution of mean 4 minutes with a...

    Started by rhubarb‎, 08-03-2012 09:13 AM
    • Replies: 1
    • Views: 1,432
    08-03-2012, 11:07 PM Go to last post
  2. Unhappy Help in understand this formula

    Hello to all, I'm working on a problem which is as follow: There is a buffer which has maximum K capacity to store items. When a request for an...

    Started by aram_2‎, 08-03-2012 05:12 AM
    • Replies: 1
    • Views: 773
    08-03-2012, 10:20 AM Go to last post
  3. Die probabilistic

    i am reading Mostellers book on 50 difficult probability questions. the question I am struggling with is on the average, how many times must a die be...

    Started by gibbspr@yahoo.co.uk‎, 08-02-2012 07:28 AM
    • Replies: 8
    • Views: 1,940
    08-02-2012, 04:57 PM Go to last post
  4. colored balls probability..Please read

    Dear All Please give your attention to following and help. There are white(9/16) and black(7/16) balls in box with probabilities...

    Started by Telet Ted‎, 08-02-2012 03:09 AM
    • Replies: 2
    • Views: 1,789
    08-02-2012, 08:05 AM Go to last post
  5. Joint Distribution

    Hi,I need some help here: Toss a fair coin twice. Define X,Y and Z as : X=1 if HH or HT X=0 if TH or TT Y=1 if HH or TH Y=0 if HT or TT

    Started by violette‎, 07-28-2012 12:31 AM
    • Replies: 5
    • Views: 1,904
    08-01-2012, 08:03 PM Go to last post
  6. show P(N>n)=P(X_(n:n)−X_(1:n)<α)

    suppose X1,X2, is sequence of independent random variables of U(0,1) if N=min{n>0:X_(n:n)−X_(1:n)>α,0<α<1} that X_(1:n) is smallest order statistic...

    Started by hadiSanji‎, 08-01-2012 08:58 AM
    probability
    • Replies: 0
    • Views: 29,037
    08-01-2012, 08:58 AM Go to last post
  7. Normal Approximation

    edit: Nevermind... apparently the answer key is wrong...

    Started by Niax‎, 07-31-2012 09:14 PM
    • Replies: 1
    • Views: 1,504
    07-31-2012, 10:19 PM Go to last post
  8. finding E(N) in this question

    suppose X1,X2, is sequence of independent random variables of U(0,1) if N=min{n>0:X_(n:n)−X_(1:n)>α,0<α<1} that X_(1:n) is smallest order statistic...

    Started by hadiSanji‎, 07-31-2012 06:38 PM
    probability
    • Replies: 0
    • Views: 1,472
    07-31-2012, 06:38 PM Go to last post
  9. random variables - expected value of time taken to perform a service

    Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

    Started by Mexikano‎, 07-26-2012 11:16 AM
    • Replies: 5
    • Views: 2,015
    07-31-2012, 01:35 AM Go to last post
  10. 'Bayesian version' of the Cramer-Rao lower bound?

    just wondering if there is some sort of "Bayesian version" of that very useful and popular result that people use in maximum likelihood, the...

    Started by spunky‎, 07-30-2012 09:31 PM
    • Replies: 3
    • Views: 2,761
    07-30-2012, 10:00 PM Go to last post
  11. I have a probability problem I need help in

    I figured out most of it need help in other parts

    Started by dakodost‎, 07-28-2012 12:58 AM
    • Replies: 3
    • Views: 1,653
    07-30-2012, 01:31 PM Go to last post
  12. placing data into which distribution?

    Hello all, I have two sets of data, which are divided by a single category. I want to be able to place further observations into one of these...

    Started by distribution‎, 07-26-2012 06:57 AM
    distribution probability
    • Replies: 1
    • Views: 1,009
    07-30-2012, 01:05 PM Go to last post
  13. Rejection with mean and standard dev given

    So I am having a little brain fart. The problem reads, The snack pack of potato chips is advertised to weigh 3.5oz . The weights are normally...

    Started by Scottymo21‎, 07-23-2012 06:31 PM
    • Replies: 1
    • Views: 1,494
    07-30-2012, 12:17 PM Go to last post
  14. "Naturally occurring" left-skewed distributions?

    hello there. for thesis purposes i'm finding myself with the need to simulate left-skewed distributions with a level of skewness i can determine...

    Started by spunky‎, 07-22-2012 08:10 PM
    • Replies: 2
    • Views: 3,690
    07-30-2012, 12:04 PM Go to last post
  15. Unhappy Lottery 'week intervals'

    This strikes me as an interesting (though potentially tricky) lottery question that I'm having trouble getting my head around. Many state...

    Started by AussieBob‎, 07-29-2012 12:36 AM
    probability question, statistic
    • Replies: 0
    • Views: 2,035
    07-29-2012, 12:36 AM Go to last post
  16. how do design an experiment given a previous one

    hello my question is : i have preformed an experiment on an electronic device. the experiment was running the device 110000 cycles in which i...

    Started by anir10‎, 07-27-2012 09:37 AM
    • Replies: 0
    • Views: 2,271
    07-27-2012, 09:37 AM Go to last post
  17. Conditional probability Question

    Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

    Started by bradyj2‎, 07-24-2012 08:55 AM
    • Replies: 1
    • Views: 1,234
    07-26-2012, 01:35 PM Go to last post
  18. Probability question about patterns

    delete this please

    Started by proba‎, 07-26-2012 08:21 AM
    • Replies: 0
    • Views: 1,374
    07-26-2012, 08:21 AM Go to last post
  19. Confidence Help

    I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural...

    Started by cisaak‎, 07-25-2012 01:40 PM
    • Replies: 0
    • Views: 1,090
    07-25-2012, 01:40 PM Go to last post
  20. Stick breaking constriction probability

    Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

    Started by bradyj2‎, 07-24-2012 08:02 AM
    • Replies: 0
    • Views: 1,394
    07-24-2012, 08:02 AM Go to last post
  21. combinatorics ...

    Hey guys here's my confusion, any help clearing it up would be wonderful ... :) Let's say you've got 2 * 6-sided dice The sample space is 6^2 =...

    Started by SBruce‎, 07-22-2012 04:23 AM
    • Replies: 2
    • Views: 1,552
    07-22-2012, 11:21 PM Go to last post
  22. Probability Question. Help!

    I have two questions that I'm stuck on: Question #1: Assume you have applied for two scholarships, scholarship A and scholarship B. The...

    Started by zain.j92‎, 07-22-2012 09:35 AM
    • Replies: 1
    • Views: 1,152
    07-22-2012, 08:21 PM Go to last post
  23. PDF of the sum of random variables

    Hello everyone, here is the problem I'm currently working on: I'm stuck on (b). I tried to find the CDF of Y first, is something like this in...

    Started by goodmorningda‎, 07-20-2012 07:15 PM
    • Replies: 1
    • Views: 1,539
    07-21-2012, 11:59 AM Go to last post
  24. Help please!

    I have this quiz due in a couple hours and Im stuck on these last two problems 1) During a certain period of time, the probability that the Food...

    Started by junkfoosow‎, 07-20-2012 03:51 PM
    • Replies: 2
    • Views: 1,126
    07-20-2012, 05:45 PM Go to last post
  25. Probability that one random variable is greater than another

    I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

    Started by b_d‎, 07-19-2012 11:03 AM
    greater, normal, probability, uniform
    • Replies: 2
    • Views: 4,046
    07-20-2012, 12:52 PM Go to last post
  26. Probability, Complements, Combinations, and Permutations (Quick Question)

    I have a population of 200 checks. Five checks are fraudulent. I select a sample of 5 checks (without replacement) What is the probability that all...

    Started by TStat‎, 07-20-2012 10:15 AM
    • Replies: 0
    • Views: 2,565
    07-20-2012, 10:15 AM Go to last post
  27. Normal Distribution Probability for a large sigma

    My question seems simple, but I'm not getting what I want. I want to know the area under the curve, to the right of x. (1-pnorm) The...

    Started by tjrome13‎, 07-19-2012 08:34 PM
    • Replies: 2
    • Views: 1,961
    07-19-2012, 08:51 PM Go to last post
  28. cant tell if i am on right track for this prababilitly hw assigment help would good!

    I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one...

    Started by nyc914‎, 07-17-2012 05:03 PM
    • Replies: 2
    • Views: 1,534
    07-18-2012, 05:32 PM Go to last post
  29. Combining Bernoulli distributions

    I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with...

    Started by b_d‎, 07-18-2012 01:55 PM
    bernoulli, binomial, combining, distribution, probability
    • Replies: 4
    • Views: 1,676
    07-18-2012, 03:20 PM Go to last post
  30. mixture modelling

    Hello, I would like to know that kind of software exists for mixture modelling? Thank you for any help that you can provide. Best wishes,...

    Started by laimonnas‎, 07-18-2012 07:24 AM
    • Replies: 0
    • Views: 1,475
    07-18-2012, 07:24 AM Go to last post
  31. Separation a mixture of two distributions

    Hello, I have 95 data points from my measurements. I plotted a histogram. It looks like a mixture (superposition) of two distributions (normal and...

    Started by laimonnas‎, 07-18-2012 03:45 AM
    • Replies: 1
    • Views: 1,430
    07-18-2012, 05:38 AM Go to last post
  32. having a bit of brain freeze with this

    Length of metal strips produced by a machine are normally distributed with mean length of 150 cm and a standard deviation of 10 cm. Find the...

    Started by tomjay‎, 07-17-2012 04:16 PM
    • Replies: 2
    • Views: 5,981
    07-17-2012, 04:19 PM Go to last post
  33. find area under non-standard normal curve (i.e. units not percentages)

    Hello, I would like some advice on how to calculate the area under a non-standard normal curve, in its own units, not relative to a...

    Started by rhouck‎, 07-17-2012 07:23 AM
    area under curve, non-standard, normal curve, probability distribution
    • Replies: 1
    • Views: 1,823
    07-17-2012, 08:36 AM Go to last post
  34. Probability question with a definite outcome

    So I'm having trouble calculating the probability of the following scenario: I have 4 possible locations for 4 boxes. Each of these boxes may...

    Started by johnson19‎, 07-16-2012 10:52 PM
    connection, definite, exist, outcome, probability
    • Replies: 2
    • Views: 1,442
    07-16-2012, 11:07 PM Go to last post
  35. Post Roulette probability question

    Ok, so here is what I want to know: I have seen probability stats about the odds of a roulette wheel landing on either red or black consecutively,...

    Started by rosebud66‎, 07-13-2012 11:30 AM
    • Replies: 4
    • Views: 2,556
    07-16-2012, 06:12 PM Go to last post
  36. The multi-factor model is a multivariate gaussian distribution?

    I'm sure that the following question is trivial, but I can't found a solid demonstration. Can we state that multi-factor model is a multivariate...

    Started by gtorrent‎, 06-28-2012 10:37 AM
    gaussian copula, multi-factor model, multivariate normal
    • Replies: 1
    • Views: 2,421
    07-16-2012, 11:11 AM Go to last post
  37. Need help!!!!!

    ..........

    Started by fc135‎, 07-14-2012 11:37 PM
    • Replies: 1
    • Views: 1,421
    07-15-2012, 09:33 AM Go to last post
  38. probability question

    A producer checks the quality of his products on a daily basis like this: first he checks 5 items randomly, and if no defects are found, he...

    Started by Yankel‎, 07-12-2012 04:18 PM
    • Replies: 1
    • Views: 1,452
    07-13-2012, 12:05 PM Go to last post
  39. bins and balls

    Working a problem from a text that asks if you have n balls and place them in n bins, what is the probability that exactly one bin remains empty. ...

    Started by kzeldon‎, 07-12-2012 10:44 PM
    • Replies: 0
    • Views: 2,635
    07-12-2012, 10:44 PM Go to last post
  40. censored data

    You put a simple defect into a car and have six randomly selected auto repair shops from city X look at it, one after the other. All six want to...

    Started by Outlier‎, 07-11-2012 07:55 PM
    • Replies: 2
    • Views: 1,626
    07-12-2012, 12:28 PM Go to last post
  41. Question about hidden markov model

    Hi guys, I have written a hidden markov model class in c++, the tests for evaluation and decoding problems was ok, but the train method wich i used...

    Started by sin0emp‎, 07-12-2012 10:53 AM
    • Replies: 0
    • Views: 1,467
    07-12-2012, 10:53 AM Go to last post
  42. A lottery question.

    So, I'm trying to help out a Euromillions syndicate to understand the probabilities of their different play options. The basic Euromillions lottery...

    Started by EricJ‎, 07-11-2012 01:55 PM
    • Replies: 1
    • Views: 1,491
    07-11-2012, 03:21 PM Go to last post
  43. Calculate probability in a concentrated group?

    If a given group of patients, each suffering from a condition that makes them 14 times more likely than the general populace to commit one act of...

    Started by Foreseen‎, 07-11-2012 10:35 AM
    • Replies: 1
    • Views: 1,323
    07-11-2012, 03:10 PM Go to last post
  44. Random walk?

    In a gambling game , you can win 1$ in each round with probability 0.6 or lose 2$ in probability 0.4. suppose you start with 100$. find the...

    Started by wuid‎, 07-11-2012 03:50 AM
    • Replies: 1
    • Views: 1,918
    07-11-2012, 04:29 AM Go to last post
  45. Cards (probability)

    What is the chance that the fifth card from the top of the deck will be a heart? Here is my attempt (I think it's outright wrong at the moment......

    Started by Niax‎, 07-10-2012 09:09 AM
    • Replies: 3
    • Views: 1,816
    07-10-2012, 05:34 PM Go to last post
  46. what is answer of this sequence?

    what is answer for this sequence when we know the related series is 1/e. a_n = 1-1/1! +1/2!+...(-1)^n/n! Regards,

    Started by Target‎, 07-09-2012 02:25 AM
    • Replies: 4
    • Views: 1,825
    07-10-2012, 06:58 AM Go to last post
  47. Permutation problem?!

    Hi all, I've been working on two problems that are really stumping me, and would really appreciate some help. Here is the problem, A computer...

    Started by dadingbanban‎, 07-09-2012 11:34 AM
    • Replies: 3
    • Views: 1,280
    07-09-2012, 04:41 PM Go to last post
  48. Post Permutation problem (password)

    Hello all, I have been struggling with this problem for a while and I would really appreciate it if you can explain it to me. A computer hacker...

    Started by jayp‎, 07-09-2012 03:53 PM
    combination, permutation, possibility
    • Replies: 0
    • Views: 2,573
    07-09-2012, 03:53 PM Go to last post
  49. Ratio of two Cauchy random variables.

    Hello. I'm trying to find the probability density function (pdf) of the random variable U = X/Y where X and Y are both iid Cauchy random...

    Started by univariate‎, 06-18-2010 09:54 PM
    • Replies: 2
    • Views: 4,058
    07-09-2012, 02:29 PM Go to last post
  50. approximating a density by using a mixture density

    Is there any journal article discussing approximating a density by having a mixture density? Or even an exact conversion? I plotted a mixture...

    Started by ltleung‎, 07-08-2012 09:01 AM
    • Replies: 1
    • Views: 1,149
    07-08-2012, 02:57 PM Go to last post
  51. Median and Mean of Independent Random Variables

    Hello, Here is the question: Let X_1,X_2, . . . ,X_n be random variables with the density \frac{1}{1+x^2} for x \in ({-\infty},{\infty}) ;...

    Started by Matt M‎, 12-22-2010 12:32 PM
    • Replies: 5
    • Views: 8,356
    07-08-2012, 09:54 AM Go to last post
  52. Interesting pdf question

    Z1,....,Z12 are iid standard normal What is the pdf of Z1/(Z2+Z3) + Z4/(Z5+Z6) + Z7/(Z8+Z9) + Z10/(Z11+Z12) My thoughts are the...

    Started by ladyluck‎, 12-05-2010 01:31 PM
    • Replies: 2
    • Views: 2,601
    07-08-2012, 09:05 AM Go to last post
  53. why this equation is correct?

    Anybody can tell me why this equation is correct? \sum^{n}_{s=k} {n\choose s}\textit{P}\{X(t)\geq j\}^{s}\textit{P}\{X(t) <...

    Started by Target‎, 07-07-2012 07:07 AM
    • Replies: 7
    • Views: 2,370
    07-08-2012, 02:48 AM Go to last post
  54. Combination/Permutation (Password)

    -Resolved- Thanks

    Started by Niax‎, 07-07-2012 07:04 PM
    • Replies: 1
    • Views: 1,624
    07-07-2012, 07:07 PM Go to last post
  55. Binomial Distribution Analysis Question

    Hi everyone. I have a couple of questions and would greatly appreciate it if you could help me out! First, I'll provide some information: ...

    Started by Algebrah‎, 10-12-2011 04:51 PM
    • Replies: 4
    • Views: 11,592
    07-07-2012, 12:07 PM Go to last post
  56. I'm not a student and the answer to this might actually save lives

    Does the following argument make statistical sense given the data? if not how can it be corrected/improved? It is all about the huge number of...

    Started by Njeri‎, 07-05-2012 07:04 AM
    • Replies: 4
    • Views: 2,487
    07-05-2012, 11:19 PM Go to last post
  57. convergence in probability help

    Hey guys, I'm hoping that one of you smarter than me can help me with understanding the concept of convergence in probability. I'm currently using...

    Started by Link‎, 07-05-2012 12:18 PM
    • Replies: 9
    • Views: 2,723
    07-05-2012, 04:09 PM Go to last post
  58. Bayesian vs. Frequentist

    Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

    Started by whomp‎, 05-06-2012 04:01 PM
    • Replies: 8
    • Views: 4,471
    07-03-2012, 03:43 PM Go to last post
  59. Limit of binomial supermartingale

    Hi! My first post here, so I'm not sure if this is an appropriate forum for my question. Anyway, here it goes. I am faced with the following...

    Started by freli005‎, 07-03-2012 03:49 AM
    • Replies: 0
    • Views: 2,062
    07-03-2012, 03:49 AM Go to last post
  60. Computing probability density function

    If I know the probability distribution of two variables, say x and y, i.e. I know that P(x) and P(y) are both gaussian, how would I compute the P(R)...

    Started by bass_mouth‎, 06-28-2012 04:49 PM
    • Replies: 4
    • Views: 1,725
    07-01-2012, 11:17 PM Go to last post

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