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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: 31,047
    09-30-2005, 09:44 AM Go to last post
  1. Question Help Reviewing Central Limit Theorem Multiple Choice Questions

    Hi All, Can someone help me review my answers below? This is a practice quiz and I am unable to get a good score. I am not sure which question I am...

    Started by viv_shc‎, 05-14-2014 11:09 AM
    binomial setting, central limit theorem, sampling distribution
    • Replies: 2
    • Views: 5,037
    05-14-2014, 11:47 AM Go to last post
  2. Name of distribution with density proportional to incomplete gamma function

    Hi, Does anyone know the name of the probability distribution with the following density function? f_X(x)=\frac{\Gamma}{\Gamma}, where x>0,...

    Started by milestones‎, 05-12-2014 12:34 PM
    gamma function, probability density, pseudo wishart
    • Replies: 2
    • Views: 1,338
    05-14-2014, 08:45 AM Go to last post
  3. Unhappy PLEASE lead me in the right direction!

    Here is the question that I can't seem to figure out!!! PLEASE HELP!! I've attached the JPEG of the question. This is my last question out of about...

    Started by quadoduece‎, 05-13-2014 11:37 PM
    • Replies: 6
    • Views: 2,045
    05-14-2014, 01:48 AM Go to last post
  4. Percentage with multiple tries problem

    So I'm trying to figure out what the percentage of having a successful roll on any of three tries would be when the success rate for any single roll...

    Started by xenu12‎, 05-10-2014 11:54 AM
    • Replies: 3
    • Views: 1,880
    05-11-2014, 01:09 PM Go to last post
  5. A simple probability theory question, but the answer may not be simple.

    Hi, I have the following question. Suppose I draw a measure of 0<m<1 points uniformly without replacement from . What is the probability that less...

    Started by kaoyanone‎, 05-11-2014 03:02 AM
    drawn without replacement, probability, unit interval
    • Replies: 2
    • Views: 1,502
    05-11-2014, 11:45 AM Go to last post
  6. mean of 2 Poisson process variables

    I have a Poisson process N(t)~Poiss(t*lambda), what is the mean of E(N(6)*N(10)) because it is a a Poisson process N(6) and N(10) are dependent (i...

    Started by mamus‎, 05-10-2014 11:01 AM
    • Replies: 4
    • Views: 1,974
    05-11-2014, 09:37 AM Go to last post
  7. Independence of Gaussian and non-Gaussian variables

    Hi, If X is a Gaussian random variable, and Y is a non-Gaussian random variable, what are the necessary conditions for X and Y to be independent?...

    Started by graeme‎, 05-09-2014 10:45 PM
    • Replies: 2
    • Views: 1,931
    05-10-2014, 01:50 PM Go to last post
  8. Dice Probability (2d6, 3d6, 4d6)

    I would like to find the probabilities of rolling a result using different numbers of six-sided dice. I am looking for the best way to figure out the...

    Started by Corkle‎, 05-08-2014 02:36 AM
    • Replies: 2
    • Views: 6,443
    05-10-2014, 12:50 AM Go to last post
  9. Application of conditional probability with three variables

    I have a question concerning the following problem: A hunter has a double-barrelled shotgun. The probability that at least one shot hits the...

    Started by desy‎, 05-09-2014 04:45 PM
    bayesian formula, conditional probabilty
    • Replies: 0
    • Views: 2,282
    05-09-2014, 04:45 PM Go to last post
  10. joint probability with conditional

    Hello, What is P(A|B, C)? I have a dataset and I want to estimate the mutual information of A|B and C. The formula for mutual information is ...

    Started by xag‎, 05-05-2014 03:27 AM
    conditional probability, estimation, joint probability, mutual information
    • Replies: 1
    • Views: 1,401
    05-05-2014, 12:18 PM Go to last post
  11. Cumulative Beta Distribution Function Help

    Hi everyone, I was wondering if someone could help me figure out how this function works. My problem is not that I need homework help, it's that...

    Started by idkstats14‎, 12-22-2010 02:21 PM
    • Replies: 13
    • Views: 12,927
    05-05-2014, 04:07 AM Go to last post
  12. Probability in an "on-off" cycle

    A process runs in a cycle and has a wait time prior to and then after a period of activity. So say at time = 0 the process is "off" for a count of...

    Started by MikeC710‎, 05-03-2014 08:49 AM
    • Replies: 8
    • Views: 2,184
    05-03-2014, 10:43 AM Go to last post
  13. Quasi-poisson distribution, quantile function

    Hello, I am searching for a closed form representation of the quantile function for the quasi-poisson distribution. Also, if anyone knows of any...

    Started by GTaiko‎, 05-01-2014 01:44 PM
    • Replies: 2
    • Views: 1,739
    05-03-2014, 08:32 AM Go to last post
  14. Smile The auto-correlation of poissonian point process

    I saw in a paper that the autocorrelation function of a poissonian point process is the following, R(t)=v^2+v*delta(t), written in Matlab style. The...

    Started by humenghu‎, 04-21-2012 10:41 AM
    • Replies: 2
    • Views: 6,819
    04-29-2014, 02:00 PM Go to last post
  15. Statistics Probability question

    At an allergist’s office, patients are screened for having a peanut allergy. The probability of having a peanut allergy is 0.023. The probability...

    Started by laurenwatkins‎, 04-28-2014 02:17 PM
    • Replies: 6
    • Views: 1,988
    04-29-2014, 11:46 AM Go to last post
  16. What does "Combined Estimates of the mean and standard deviation" mean?

    Hi All! We have this exercise in class where we are given the table below: ---------------Estimate of the------Estimate of the...

    Started by glensy‎, 04-28-2014 09:48 AM
    • Replies: 0
    • Views: 1,350
    04-28-2014, 09:48 AM Go to last post
  17. probability question

    Hello, I need help with the following problem I would appreciate it if you could help me. A supermarket sells 4 competitive items a, b, c and d....

    Started by jetry‎, 04-26-2014 01:46 PM
    • Replies: 4
    • Views: 1,528
    04-27-2014, 03:00 AM Go to last post
  18. help with a tricky question

    hi guys, when i was looking for statistics exams to practice i found this problem at mit final exam back at 2004 the condition for failure of a...

    Started by MFM‎, 04-21-2014 09:36 AM
    • Replies: 6
    • Views: 1,767
    04-21-2014, 04:52 PM Go to last post
  19. Relating Type I and Type II Error to C-charts

    Hello, I am trying to figure out how to relate type I and type II error calcuations to c-charts. Ive already calculated the 3 sigma control...

    Started by math&science‎, 04-20-2014 09:49 PM
    • Replies: 9
    • Views: 2,622
    04-21-2014, 03:25 PM Go to last post
  20. Using central limit theorem for approximation

    I am working on a past exam question and I am not so sure whether or not my answer is correct. If anybody could give me any guidance i would be most...

    Started by ingrid1994‎, 04-20-2014 12:20 PM
    • Replies: 1
    • Views: 1,329
    04-20-2014, 01:19 PM Go to last post
  21. Probability

    25 blocks arranged randomly in a circle: 15 red and 10 blue. X is the Number of blue blocks that has red blocks on both sides. What is the...

    Started by natanr123‎, 04-20-2014 07:32 AM
    • Replies: 3
    • Views: 1,456
    04-20-2014, 10:40 AM Go to last post
  22. what is the most honest way to divide the prize?

    Two men play some game several times till 10 wins. From the beginning each of them puts 500$ for the final prize. At the score 7:4 they stopped...

    Started by eliranazulay‎, 04-12-2014 02:57 PM
    • Replies: 2
    • Views: 1,648
    04-20-2014, 10:31 AM Go to last post
  23. What type of distribution

    Hello I am a novice in probabilities and statistics and I am working on a data mining project I am currently analysing the reliability of medical...

    Started by dora.polenta‎, 04-18-2014 04:19 AM
    • Replies: 3
    • Views: 1,782
    04-18-2014, 10:20 AM Go to last post
  24. moments vs parameters

    Hi there, could you help me to understand the difference between moments and parameters of a distribution? I read definitions of moments like...

    Started by ilaria‎, 04-16-2014 04:48 AM
    • Replies: 3
    • Views: 3,850
    04-17-2014, 11:35 AM Go to last post
  25. Probability growth with time

    Hey, I am not an expert at probability. I've been wondering about a simple question that seem really hard for me to find an answer to simply by...

    Started by elite5chris‎, 04-16-2014 03:56 PM
    • Replies: 2
    • Views: 1,881
    04-17-2014, 11:34 AM Go to last post
  26. Joint distributions for Order Statistics

    I have a problem with part b of this question. I found the joint distribution and seem to have problem integrating it. I seem to have gotten a double...

    Started by bk123‎, 04-26-2013 12:45 PM
    • Replies: 8
    • Views: 2,714
    04-17-2014, 10:50 AM Go to last post
  27. Probability that a normal random variable lies between 2 values

    Hi all, I have been looking at this problem for a little while now and can't get anywhere with it. All of my notes relate to a variable lying between...

    Started by hula‎, 04-15-2014 09:25 AM
    • Replies: 1
    • Views: 1,403
    04-15-2014, 09:49 AM Go to last post
  28. Continuous probabibility distribution.

    Please help me with this problem, I don't understand it pretty well. The management of bidding of a company understands that the low bid X in...

    Started by camilaberas‎, 04-15-2014 01:25 AM
    • Replies: 0
    • Views: 973
    04-15-2014, 01:25 AM Go to last post
  29. Conditional Probability?

    What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

    Started by mathprof‎, 04-12-2014 07:45 PM
    conditional probability, dice
    • Replies: 5
    • Views: 1,769
    04-12-2014, 11:20 PM Go to last post
  30. A bouncing ball is giving me fits.

    Hi. Thank-you for reading this. My name's Philip Ripper. I'm not a student. I'm a curious person with a fairly poor math education. This is...

    Started by Tethers‎, 04-11-2014 12:00 PM
    • Replies: 6
    • Views: 1,692
    04-11-2014, 08:53 PM Go to last post
  31. Seemingly unsolvable conditional probability

    The following is a question that is likely to be appear on my exam on Friday (tomorrow) but contextualised into a different scenario. I'm having...

    Started by scotty93‎, 04-10-2014 06:49 AM
    normal distribution, probability density, statistics
    • Replies: 2
    • Views: 1,096
    04-10-2014, 09:39 AM Go to last post
  32. A probability question

    Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2...

    Started by acevialli‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 1,641
    04-09-2014, 07:50 AM Go to last post
  33. Electrical Engineering Random Process

    The question is below. A Random Process is given by X(t) = St + A. for t>=0 and X(t) = 0 for t<0. S is a zero-mean Gaussian RV with standard...

    Started by Crusader256‎, 04-08-2014 04:17 PM
    • Replies: 4
    • Views: 1,629
    04-08-2014, 08:46 PM Go to last post
  34. Probability Questions. Electrical Engineering.

    I am having a difficult time with these questions. Can anyone help?

    Started by TEE262014‎, 04-08-2014 03:15 PM
    • Replies: 1
    • Views: 1,987
    04-08-2014, 03:49 PM Go to last post
  35. Extreme Value Theory with Gamma variables

    Hey guys, I'm a bit of a statistics weakling so I could use some help on a problem I'm trying to solve. Basically I got N random gamma variables...

    Started by MagnetsGT‎, 04-08-2014 02:27 PM
    • Replies: 0
    • Views: 1,589
    04-08-2014, 02:27 PM Go to last post
  36. Probability in normal distribution

    The weight of persons in a country is normally distributed with a mean equal to 70 kg and a standard deviation equal to 12 kg. a. What is the...

    Started by Tadele‎, 04-08-2014 07:36 AM
    • Replies: 1
    • Views: 1,156
    04-08-2014, 07:58 AM Go to last post
  37. Please help me to solve a problem on conditional probability

    Please help me to solve a problem on conditional probability: 91 from 144 fishes in the river are polluted, only 6 fishes from these 144 are...

    Started by Scrooge‎, 04-05-2014 01:56 PM
    • Replies: 3
    • Views: 1,546
    04-05-2014, 03:11 PM Go to last post
  38. Binomial distribution problem.

    I think this is a binomial distribution problem but I just don't know how to solve it. It gets a bit hard when I have to decide which is x, n or p ...

    Started by camilaberas‎, 03-31-2014 11:35 AM
    • Replies: 1
    • Views: 2,846
    03-31-2014, 11:54 AM Go to last post
  39. A question in order statistics of continuous type distribution

    Let X1,X2,… be a sequence of random variables from a continuous type distribution and m and n be two integers such that m<n, and 2≤n−m. How can I...

    Started by hadiSanji‎, 03-30-2014 08:32 PM
    • Replies: 1
    • Views: 1,568
    03-30-2014, 11:02 PM Go to last post
  40. Mental block on concept of PDF for a duration

    I'm reading "A Tutorial on Hidden Markov Models and Selected Applications in Speech Recognition" and I am having a problem conceptually...

    Started by learnitapplyit‎, 03-26-2014 06:41 PM
    • Replies: 2
    • Views: 1,959
    03-26-2014, 08:25 PM Go to last post
  41. Limit in probability of (x-bar)^2 ?

    Anyone have any idea how to prove or show what the limit in probability of (x-bar)^2 is? sample is drawn from CDF F(x)=1-x^-4

    Started by haml.kn‎, 03-25-2014 08:43 PM
    convergence, probabilistic sampling, probability
    • Replies: 3
    • Views: 2,692
    03-26-2014, 07:31 PM Go to last post
  42. Continuous Local Martingale Question

    I have attempted the following local martingale question. I'm not sure if the proof is correct. If M is in the space of continuous local...

    Started by chrishello‎, 03-25-2014 05:53 PM
    • Replies: 2
    • Views: 1,281
    03-26-2014, 08:30 AM Go to last post
  43. How to determine distribution with no parameters

    I'm confused by this question and I was hoping for some guidance some one to point me in the right direction Let X1.........Xn be a random sample...

    Started by haml.kn‎, 03-24-2014 09:40 PM
    probability, probability distribution
    • Replies: 3
    • Views: 2,323
    03-25-2014, 08:45 PM Go to last post
  44. Binomial Distribution in Excel

    7. An emergency room administrator wants to know the proportion of emergency room patients who spend more than one hour waiting to be seen. He has...

    Started by xdayita‎, 03-22-2014 07:26 PM
    • Replies: 1
    • Views: 1,978
    03-24-2014, 03:04 PM Go to last post
  45. Similar numbers in a data set

    Hi guys, I am looking at a programming problem here, and would like to "deduce" a formula out of my problem. I have an array of n (known)...

    Started by alex01‎, 03-22-2014 10:34 AM
    probability question, similarities, statistics
    • Replies: 2
    • Views: 1,666
    03-22-2014, 02:22 PM Go to last post
  46. Probability and coincidences help

    Can someone please help in the breakdown of how I do this question I am completely lost and I am not sure how to even word the answers ...

    Started by clarence85‎, 03-22-2014 01:51 AM
    coincidences, probability help, probability homework help
    • Replies: 0
    • Views: 969
    03-22-2014, 01:51 AM Go to last post
  47. Question Forecasting with several models

    I would like to know how to deal with (presumed) independent models that provide different forecasted values. For example, let's assume that I...

    Started by Perrete‎, 03-19-2014 08:45 AM
    • Replies: 0
    • Views: 1,252
    03-19-2014, 08:45 AM Go to last post
  48. Smile Probability question making my brain hurt :p

    "suppose you know that a friend of yours has two children and that at least one of them is a boy. One day, you visit your friend's house and his son...

    Started by clairethackray‎, 03-17-2014 11:14 PM
    • Replies: 1
    • Views: 10,215
    03-18-2014, 03:22 AM Go to last post
  49. binomial random variable

    I'm having trouble understanding how I'm supposed to answer part a of this question I'm on. I was able to do b, c, d, and e though. Problem: The...

    Started by lindseyam‎, 03-17-2014 02:46 PM
    • Replies: 0
    • Views: 3,283
    03-17-2014, 02:46 PM Go to last post
  50. P/1 Actuarial exam practice

    If anybody here is preparing for the p/1 actuarial exam then you may be interested in some practice exams I have prepared. The newest version can...

    Started by geniuslikeme‎, 12-28-2012 04:14 PM
    actuarial, exam, practice
    • Replies: 3
    • Views: 2,623
    03-17-2014, 10:52 AM Go to last post
  51. correlation matrix

    E = integral o to 2i of the exp( ) = 2*pi*exp(i*x1(-m)) likewise for the x2 *x2 case = 2*pi*exp(i*x2*(-m)) For the other two parts E = I am...

    Started by stephanie‎, 03-13-2014 10:24 PM
    • Replies: 1
    • Views: 1,456
    03-15-2014, 10:56 PM Go to last post
  52. Multivariate distributions that are 'closed' under marginalization?

    a very, very nice property of the multivariate normal distribution is that any lower-dimensional margins are also multivariate (or univariate,...

    Started by spunky‎, 03-14-2014 02:19 PM
    marginal probability, probability distributions
    • Replies: 4
    • Views: 3,720
    03-15-2014, 09:50 PM Go to last post
  53. variance of cosine functions

    What are stronger inequality bounds than the chebyshev for variance?

    Started by nikki101‎, 03-14-2014 03:58 PM
    • Replies: 0
    • Views: 3,474
    03-14-2014, 03:58 PM Go to last post
  54. Number of trials in zero-sum game

    Hi all, this is my first post here! Forgive me if it's not in the right place. I have a question that's been bugging me because I tend to be...

    Started by SR_87‎, 02-11-2014 05:46 AM
    • Replies: 5
    • Views: 2,123
    03-14-2014, 08:20 AM Go to last post
  55. First stats course. need help with this problem

    a tree stand has 12 douglas firs, 10 maples, 3 hemlocks, and 7 cedars. if you randomly select 6 trees, what is the probability that at least 2 of...

    Started by pearza‎, 03-10-2014 11:08 PM
    • Replies: 5
    • Views: 2,422
    03-11-2014, 02:10 PM Go to last post
  56. Need some help on this question. Thanks

    There are 12 balls in a bag that are numbered 1-12. I will choose one number (say I choose no. 5). Then four balls are picked at random. What is the...

    Started by Redoxified‎, 03-10-2014 07:55 AM
    • Replies: 3
    • Views: 1,775
    03-11-2014, 05:05 AM Go to last post
  57. Coin Flip and calling randomly

    If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

    Started by codenamenikky‎, 03-07-2014 05:06 PM
    basic probability, coin flips
    • Replies: 5
    • Views: 1,707
    03-10-2014, 08:47 AM Go to last post
  58. Z-values and probability

    Suppose concentration of arsenic (in ppb) in groundwater sampled quarterly from a particular well can be modeled with a normal distribution with a...

    Started by chickennugget‎, 03-09-2014 07:30 PM
    probability homework help
    • Replies: 0
    • Views: 1,402
    03-09-2014, 07:30 PM Go to last post
  59. Event Tree Probability Question

    Event Tree Probability Question. One has tried looking this one up and Googling it, One is also dispraxic so while math can be tricky if one can...

    Started by MattAdlard‎, 03-09-2014 02:34 PM
    event tree, proability, probability
    • Replies: 0
    • Views: 2,305
    03-09-2014, 02:34 PM Go to last post
  60. Continuity correction, poisson

    Hi There is something that puzzles me. I tried calculating a Poisson probability. Exactly, and with the normal distribution, using both the...

    Started by Tarly‎, 03-09-2014 10:08 AM
    • Replies: 3
    • Views: 2,978
    03-09-2014, 11:27 AM Go to last post

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