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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: 30,253
    09-30-2005, 09:44 AM Go to last post
  1. Word problem needs double checking.

    There are 10 seniors, 8 juniors, 5 sophomores and 3 frshman on student council. A committee of 6 members is formed. a.p(all seniors) b.p(3...

    Started by ethunnn‎, 03-30-2013 10:04 PM
    • Replies: 2
    • Views: 1,473
    05-10-2013, 02:16 PM Go to last post
  2. Determining the probability that two data sources are the same

    I've been looking for the answer to this problem for a while now and I think a large part of it is that I don't know how to frame the question. Here...

    Started by TommyJimmy‎, 01-03-2013 09:43 AM
    • Replies: 5
    • Views: 2,009
    05-10-2013, 03:50 AM Go to last post
  3. Help with correlation and coefficient

    Hi just wondering if anyone could help me out with this question that I'm stuck with, it's a question from the past exam paper that might come up...

    Started by Minni‎, 05-09-2013 11:54 AM
    • Replies: 1
    • Views: 2,107
    05-09-2013, 01:41 PM Go to last post
  4. Question Question Paper Probability

    Hi all, I'm new to this forum and hope you guys will be able to assist with a basic probability question I can't seem to figure out. My...

    Started by kiepie‎, 05-08-2013 10:18 AM
    • Replies: 3
    • Views: 1,504
    05-08-2013, 10:40 AM Go to last post
  5. Minimising wastage in cutting poles problem

    Hi, I'm working this problem for a Probability course and having trouble with what to do after the very first step. The problem is: I think for...

    Started by CheesePlease‎, 05-07-2013 06:04 AM
    • Replies: 4
    • Views: 1,766
    05-08-2013, 08:02 AM Go to last post
  6. What is the probability of ones at least one ancestor has prostituted?

    Given the oldest profession is prostitution.

    Started by urshanabi‎, 05-08-2013 06:34 AM
    • Replies: 1
    • Views: 1,999
    05-08-2013, 07:47 AM Go to last post
  7. Are (sample) correlation matrices covariance matrices?

    All my life I had been under the impression that the correlation matrix was a type of covariance matrix. They share similar features: they are...

    Started by will22‎, 05-07-2013 01:32 PM
    • Replies: 2
    • Views: 1,333
    05-07-2013, 03:21 PM Go to last post
  8. probability of events in a row with binomial

    Hi, Suppose I have an event with probability p. I understand how to use the binomial formula to find the probability of k occurrences of that...

    Started by blmdzr‎, 05-04-2013 11:42 AM
    • Replies: 7
    • Views: 2,543
    05-07-2013, 06:23 AM Go to last post
  9. Probability distribution of active calls at a telephone exchange

    Please, could someone help me with this exercise from this book: Suppose that calls arrive at a telephone exchange according to a Poisson process...

    Started by zakmck‎, 05-05-2013 12:35 PM
    • Replies: 6
    • Views: 3,655
    05-06-2013, 07:37 AM Go to last post
  10. Joint Distribution - Need some guidance

    I have a problem that I am not sure how to solve, and would appreciate any guidance, help, or direction... The problem states: Suppose the...

    Started by statsprobs‎, 05-02-2013 08:28 PM
    probability
    • Replies: 3
    • Views: 2,834
    05-05-2013, 11:33 PM Go to last post
  11. Probability that values from different normal distributions will be in a given order?

    I am looking at several normal distributions that describe the same metric for different populations (independent). I want to find the probability...

    Started by mlongoria09‎, 05-05-2013 10:20 AM
    normal distributions, probability
    • Replies: 1
    • Views: 2,247
    05-05-2013, 12:07 PM Go to last post
  12. Calculate the Expected value,Variance,density and 2nd moment

    I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

    Started by alfred_oh‎, 05-03-2013 07:13 AM
    • Replies: 3
    • Views: 1,569
    05-04-2013, 08:04 AM Go to last post
  13. Integration of factorial?

    If I want to figure out the constant, c, for the following joint probability mass function: { c(2^(x+y))/(x!)(y!) for x is an element of...

    Started by statsprobs‎, 05-02-2013 10:34 PM
    • Replies: 2
    • Views: 3,826
    05-03-2013, 11:15 PM Go to last post
  14. The sample covariance matrix is ALWAYS nonsingular... Right?

    Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

    Started by will22‎, 04-30-2013 11:04 PM
    • Replies: 8
    • Views: 9,232
    05-03-2013, 01:27 PM Go to last post
  15. Use a tree diagram to calculate the probability

    Hi everybody! I have to solve this exercise. We observe a tournament of 2 ^ n players, which consists of n rounds. In each round every 2 players...

    Started by alfred_oh‎, 05-03-2013 09:41 AM
    • Replies: 0
    • Views: 2,076
    05-03-2013, 09:41 AM Go to last post
  16. Central Limit Thrm / Chebyshev Problem

    Suppose the price of a particular stock changes from day to day according to the following model. If Yn is the price of the stock on day n, then Yn =...

    Started by tlanz‎, 05-02-2013 09:57 PM
    • Replies: 3
    • Views: 2,340
    05-03-2013, 01:21 AM Go to last post
  17. Dice Problem

    Hi there, There's a the problem I've been trying to solve for the past two days. I have 5 dice, each with a different number of sides. Dice A:...

    Started by Fatman‎, 05-02-2013 02:45 PM
    • Replies: 2
    • Views: 1,970
    05-02-2013, 05:46 PM Go to last post
  18. Sequence probability, need a cross-check

    This is not a homework problem so, I don't have a grader or a TA to assist. Short problem: In a randomly generated 5 digit number (including...

    Started by DKATyler‎, 04-05-2013 06:59 PM
    • Replies: 5
    • Views: 1,757
    05-02-2013, 01:34 PM Go to last post
  19. Little help please with probability

    A study indicates that 80% of college students having cell phones send and receive text messages with their phones. A) A sample of these students of...

    Started by Turk999‎, 05-02-2013 12:24 AM
    • Replies: 1
    • Views: 2,076
    05-02-2013, 12:38 AM Go to last post
  20. Probability, Markov chain

    A teacher leaves out a box of N stickers for children to take home as treats. Children form a queue and look at the box one by one. When a child...

    Started by SarahCh‎, 05-01-2013 04:50 PM
    • Replies: 1
    • Views: 1,728
    05-01-2013, 10:40 PM Go to last post
  21. Density of a random variable

    Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

    Started by alfred_oh‎, 04-30-2013 08:53 AM
    • Replies: 2
    • Views: 1,670
    04-30-2013, 09:22 AM Go to last post
  22. Can anyone help me with this exercise?

    Hi! I have to do this exercise: Define a finite probabilistic Space (Ω; Pr) and 2 events A,B⊆ Ω and Pr ≠ Pr so that we can verify that ...

    Started by alfred_oh‎, 04-30-2013 06:53 AM
    • Replies: 1
    • Views: 1,902
    04-30-2013, 09:10 AM Go to last post
  23. Can anyone explain me the solution of this exercise please?

    Hi i've found this exercise but I do not understand the solution: _________________________________________________________________ In a party c...

    Started by alfred_oh‎, 04-30-2013 04:15 AM
    • Replies: 2
    • Views: 1,565
    04-30-2013, 05:52 AM Go to last post
  24. Question VERY rusty tutor (for statistics, anyway) needs help to teach student!

    I haven't done statistics for well over a decade and I'm known the family as the math tutor because I previously brought my wife's cousin up from an...

    Started by Math_Tutor‎, 04-28-2013 04:28 PM
    • Replies: 5
    • Views: 1,591
    04-29-2013, 10:42 AM Go to last post
  25. Exclamation Homework Problem. Please Help!

    I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

    Started by ca91‎, 04-28-2013 12:45 AM
    homework, homework help
    • Replies: 6
    • Views: 2,866
    04-28-2013, 02:30 PM Go to last post
  26. joint probability density function question

    I attached the joint probability density function and my work in 1 document. I just want to make sure that I am setting this up correctly to find the...

    Started by statsprobs‎, 04-26-2013 10:38 PM
    • Replies: 2
    • Views: 1,905
    04-28-2013, 06:17 AM Go to last post
  27. How to compute the joint Probability distribution of the functions of random variable

    Hi all, I have a problem about joint CDF. X and Y are independent random variables with known Probability density functions. Now there are...

    Started by camnjv‎, 04-27-2013 05:39 AM
    • Replies: 9
    • Views: 2,346
    04-27-2013, 07:06 PM Go to last post
  28. stochastic birth-death processes: electronic resources

    I am interested in stochastic birth-death processes at about the level of Karlin and Taylor's 1975 text. My eyes are bad so I have a hard time...

    Started by radiobiologist‎, 04-26-2013 03:42 PM
    • Replies: 0
    • Views: 1,603
    04-26-2013, 03:42 PM Go to last post
  29. Probability exam questions with worked-out solutions

    Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

    Started by chris ball‎, 04-26-2013 03:53 AM
    • Replies: 0
    • Views: 5,756
    04-26-2013, 03:53 AM Go to last post
  30. Random Walk, Programming it.

    Hi, I've recently became interested in learning about stochastic processes so after a bit of light reading, i decided to put this into action. I...

    Started by jamesmartinn‎, 04-13-2012 10:25 PM
    • Replies: 4
    • Views: 5,111
    04-25-2013, 03:50 PM Go to last post
  31. (What may be) A beginner problem!

    Just as a disclaimer, I have never taken a probability or stats course, so please excuse me for not being up to snuff around here. Anyhow, for my CS...

    Started by coogan‎, 04-25-2013 11:08 AM
    • Replies: 0
    • Views: 1,493
    04-25-2013, 11:08 AM Go to last post
  32. Second Moments: Convergence in Probability

    Hi, I wish to get feedback as to whether my answer to the following is correct/adequate. Attached for your review. Thanks.

    Started by meeksoup‎, 04-25-2013 07:44 AM
    • Replies: 1
    • Views: 1,820
    04-25-2013, 08:01 AM Go to last post
  33. Post Probaility Solution.

    A quiz consists of 20 true-false questions. The score for each question is 1 point if it is answered correctly, and 0 otherwise. 1) Suppose a...

    Started by saravanan‎, 04-23-2013 02:06 AM
    • Replies: 1
    • Views: 2,131
    04-25-2013, 06:09 AM Go to last post
  34. Renewal Process

    Use the Laplace transform approach to find the renewal function for a renewal process with interrenewal p.d.f. as follows: g(x) = (c^2)xe^(-cx) ,...

    Started by SantyClause‎, 04-24-2013 04:22 PM
    • Replies: 1
    • Views: 1,940
    04-25-2013, 04:00 AM Go to last post
  35. Probability: 10 true/false questions, probability at least 7 are correct

    An instructor gives a quiz involving 10 true-questions. To test the hypothesis that he student is guessing, the following rule is adopted: a) If 7...

    Started by 1nvictus‎, 04-25-2013 01:52 AM
    • Replies: 1
    • Views: 2,937
    04-25-2013, 02:07 AM Go to last post
  36. Continuity Correction Questions

    I understand the concept of continuity corrections for normal approximations, but I do not understand how to apply them. Most sites state that you...

    Started by FromHonoluluWithLove‎, 04-24-2013 11:04 PM
    1/2n, continuity correction
    • Replies: 0
    • Views: 2,290
    04-24-2013, 11:04 PM Go to last post
  37. Expected searches calculation for finding a discrepancy

    Say you have an urn containing two different coloured balls. If the task is to keep blindly selecting balls without replacement until a 'target'...

    Started by chester‎, 04-22-2013 07:49 PM
    • Replies: 1
    • Views: 1,797
    04-23-2013, 12:41 AM Go to last post
  38. Hypergeometric and Binomial Distributions

    Hi all, I am getting a bit confused with these two questions: 1. 20% of widgets are faulty previously. You receive a lot of 20 widgets. You...

    Started by rebeccax‎, 04-20-2013 11:01 AM
    binomial, hypergeometric
    • Replies: 1
    • Views: 2,632
    04-21-2013, 02:32 PM Go to last post
  39. Combining properties of expected values and variances

    Hi! First post here so cut me a bit of slack Hopefully an easy topic too (I'm new to stats). If I have some values for E(X) (e.g. 5min) and...

    Started by slowrolla‎, 04-16-2013 04:05 PM
    • Replies: 1
    • Views: 1,809
    04-21-2013, 02:13 PM Go to last post
  40. Stochastic Processes - Probability of r heads in a row before s tails in a row?

    A biased coin is tossed repeatedly, with p the probability of heads on any single toss. Find the probability that there is a run of r heads in a row...

    Started by chrishello‎, 04-17-2013 05:25 AM
    • Replies: 2
    • Views: 2,728
    04-17-2013, 07:57 PM Go to last post
  41. Difference between likelihood and the posterior probability (bayesian statistics)

    Hello everyone. I am having a little bit of trouble wrapping my head around the difference between the likelihood and the posterior probability in a...

    Started by will22‎, 04-13-2013 02:46 PM
    • Replies: 4
    • Views: 9,494
    04-15-2013, 08:12 AM Go to last post
  42. Multiplicative/Additive Law Question

    In a game you have three chances to hit a ball. On each try you'll either score a hit, H, or a miss, M. After each try you have to alternate hands...

    Started by StatsMan04‎, 04-14-2013 10:02 AM
    • Replies: 1
    • Views: 2,400
    04-14-2013, 10:20 AM Go to last post
  43. 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...

    Started by arthurshaw‎, 04-09-2013 09:59 PM
    • Replies: 2
    • Views: 2,148
    04-11-2013, 04:02 PM Go to last post
  44. when (if ever) is Var(X) + Var(Y) > 2Cov(X,Y)

    Hello to everyone. I have been asked to show when the following inequality holds and, if it never does, to also explain it. I am working under the...

    Started by will22‎, 04-09-2013 12:36 PM
    • Replies: 3
    • Views: 1,677
    04-09-2013, 07:04 PM Go to last post
  45. Correlation coeficient(X,rank(X))

    Given a sample of size N from a standard normal, I'd like to compute the correlation coeficient(X,rank(X)). So I need the expected value fo X*F(X)......

    Started by Devanil‎, 04-07-2013 08:13 PM
    • Replies: 3
    • Views: 1,932
    04-09-2013, 05:09 PM Go to last post
  46. NCAA seed problem

    Hello I am working on my final project and am having a lot of difficulty because it is over NCAA stuff and I have never watched a basketball game in...

    Started by jigglymig‎, 04-07-2013 12:26 PM
    • Replies: 2
    • Views: 1,699
    04-07-2013, 04:15 PM Go to last post
  47. Random Stats Question - Need a Refresher

    Hi there, I am a finance major that took some 500 level statistics classes at one point in time. Unfortunately my statistics knowledge has...

    Started by Schnarno‎, 04-07-2013 08:57 AM
    • Replies: 1
    • Views: 2,405
    04-07-2013, 09:10 AM Go to last post
  48. Difference between binary logistic regression analyses and multivariate regression

    I am new to this forum, hope this is in the correct placce. Can someone explain the difference between these two?

    Started by DSW‎, 04-06-2013 04:20 PM
    • Replies: 1
    • Views: 3,095
    04-06-2013, 09:09 PM Go to last post
  49. Exercise, Poisson process

    This is an exercise from the book, Introduction to Probability Models by Sheldon M. Ross. Problem: A scientific theory supposes that mistakes in...

    Started by dante‎, 04-06-2013 12:05 PM
    • Replies: 0
    • Views: 2,922
    04-06-2013, 12:05 PM Go to last post
  50. Normal Distribution Problem

    Hello everyone, I am stuck on some problems involving normal distribution. Any help would be GREATLY appreciated. Unfortunately, this is for an...

    Started by fizoster‎, 03-31-2013 03:03 PM
    • Replies: 1
    • Views: 5,537
    04-05-2013, 03:20 PM Go to last post
  51. simple probability question

    Hello, I have a simple probability question that I was hoping somebody could answer. If I know that the probability that a charging point is...

    Started by bradyj2‎, 04-02-2013 01:49 PM
    • Replies: 2
    • Views: 1,849
    04-04-2013, 01:33 PM Go to last post
  52. Help with permutations

    A relay race has 4 runners who run different parts of the race. There are 16 students, 4 from each class level, on your track team. What is the...

    Started by ethunnn‎, 04-01-2013 08:35 PM
    • Replies: 2
    • Views: 2,492
    04-04-2013, 01:29 PM Go to last post
  53. Neyman-Pearson test

    'In the Neyman-Pearson binary hypothesis testing case, demonstrate that, in addition to the optimum, there also exists the worst possible test whose...

    Started by Toyo‎, 04-04-2013 09:59 AM
    • Replies: 0
    • Views: 1,864
    04-04-2013, 09:59 AM Go to last post
  54. Problem with calculate joint probability

    Hello I have a problem with calculating joint probabilities in text mining. i have two paralel text like this for example Bonjour les bons amis ...

    Started by cyrine‎, 04-02-2013 11:49 AM
    joint probability
    • Replies: 0
    • Views: 1,284
    04-02-2013, 11:49 AM Go to last post
  55. Fair bet question

    This is the question: Your friend proposes the following game. She will roll a fair dice six times. If the number of different numbers that show...

    Started by bobbyjoe‎, 04-01-2013 12:00 AM
    • Replies: 2
    • Views: 2,018
    04-02-2013, 04:41 AM Go to last post
  56. Some Help, Please

    Is there a way I can have these lines on my TI-84 SE? Because when I hit Zoom 9, just a line in the middle goes through to it. And another thing, if...

    Started by PSG‎, 03-28-2013 10:58 PM
    • Replies: 1
    • Views: 1,896
    04-01-2013, 04:31 PM Go to last post
  57. martingale and markov chain question

    I need help understanding a solution. http://www.stat.lsa.umich.edu/~ionides/620/hw/hw8sol.pdf On #5, I really dont understand the notation for...

    Started by SantyClause‎, 04-01-2013 12:28 PM
    • Replies: 1
    • Views: 1,985
    04-01-2013, 01:55 PM Go to last post
  58. A little confused

    I am doing these problems and I am looking at the shading, why is the 2 all the way on the right? Shouldn't it be on the left? And should the X and Z...

    Started by PSG‎, 03-25-2013 12:09 AM
    • Replies: 6
    • Views: 1,872
    03-31-2013, 03:57 AM Go to last post
  59. Beginner help with unconscious statistician

    I should really know this, but i get stuck at some differentiation. So X is a R.V. with p.d.f. f_x(x), and Y=aX+b. We want to find f_y(y). So i...

    Started by Prometheus‎, 03-30-2013 10:31 AM
    • Replies: 2
    • Views: 1,845
    03-30-2013, 04:41 PM Go to last post
  60. Can I Know The Difference and A Couple of Questions

    Mean 266 Days STD=16 Days Question 1- What is the probability that a random sample of 20 pregnancies that has a mean gestation period of 260...

    Started by PSG‎, 03-29-2013 03:41 PM
    • Replies: 2
    • Views: 1,738
    03-30-2013, 12:00 AM Go to last post

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