1. 10-14-2010
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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: 13,617
    09-30-2005, 09:44 AM Go to last post
  1. Prove: Birth-death chain has stationary distribution -> satisfy detail bal. equations

    I'm working my way through a course in stochastic processes but came across this Lemma in my coursebook where they didn't show the working (Lemma...

    Started by Sefilliatu‎, Today 04:06 AM
    birth-death chain, markov chains, probability theory, proof, self-study
    • Replies: 1
    • Views: 71
    Today, 09:08 AM Go to last post
  2. Taylor series

    This is probably really easy to see..... but I just can not get it right: // Set y = exp(x). Then x - log(1 + exp(x)) = log(y) - log(y + 1). //...

    Started by JesperHP‎, Yesterday 12:30 AM
    • Replies: 0
    • Views: 106
    Yesterday, 12:30 AM Go to last post
    • Replies: 4
    • Views: 187
    10-05-2015, 02:51 PM Go to last post
  3. Counting methods

    Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

    Started by ssx‎, 10-04-2015 08:20 PM
    • Replies: 0
    • Views: 99
    10-04-2015, 08:20 PM Go to last post
  4. Odds of getting 1 decent prize out of X chances, Y decent prizes, and Z total prizes.

    I am invited to play a game where there are 10 good prizes, 300 losers prizes, and I have 5 tokens to spend playing, 1 per turn. I know the odds...

    Started by The Magic WOmbat‎, 10-03-2015 07:20 PM
    • Replies: 3
    • Views: 169
    10-03-2015, 09:47 PM Go to last post
  5. Finding P(AnB') (Homework)

    Hi there, this is my first post on this forum. I am trying to find the probability of P(BnA') the data given is: P(A) = 1/3 P(B) = 1/3...

    Started by NikW‎, 10-03-2015 01:47 AM
    homework, homework help, proability
    • Replies: 1
    • Views: 123
    10-03-2015, 09:54 AM Go to last post
  6. Am I thinking of this the right way?

    Hi, I'm not sure if I'm thinking of the right way to do this problem: Bacterial cells are often classified by their shapes, the three most common...

    Started by jumblebee‎, 09-26-2015 02:21 PM
    • Replies: 3
    • Views: 335
    09-30-2015, 01:02 PM Go to last post
  7. Covariance of unconditional density

    I do have a minor problem with a simple covariance matrix. Let x be a first order Markov chain of length n defined by the transition matrix P,...

    Started by Tosha‎, 09-29-2015 04:39 AM
    • Replies: 0
    • Views: 165
    09-29-2015, 04:39 AM Go to last post
  8. Calculating probability of the expected number of runs needed

    Hello, I'm working on a personal project but I've hit a bit of a wall in working out an equation. I'd like to find the probability of a result given...

    Started by Zackley‎, 09-28-2015 01:03 AM
    • Replies: 6
    • Views: 251
    09-28-2015, 02:25 PM Go to last post
  9. Can probability limit be used as mean for asymptotic distribution?

    Hi there, I was wondering the following. If I have found that a variable X converges to some probability limit p and subsequently I wish to find...

    Started by Mkkl‎, 09-27-2015 11:00 AM
    asymptotic variance, plim
    • Replies: 1
    • Views: 174
    09-27-2015, 12:59 PM Go to last post
  10. Calculating the Probability of a Subset

    I'm a newbie and not a stats savvy so help and guidance is appreciated. If I use incorrect terms please forgive and correct. The data set...

    Started by dofdear‎, 09-25-2015 12:55 PM
    • Replies: 7
    • Views: 315
    09-27-2015, 01:38 AM Go to last post
  11. Probability function based on X ~ Exp(B)

    I have a problem which im having difficulties to solve. We have a continuous variable X = time measured in hours until event A happens. X is...

    Started by lukketotte‎, 09-23-2015 01:20 PM
    • Replies: 7
    • Views: 384
    09-25-2015, 05:52 AM Go to last post
  12. Post Little homework help needed

    Hi, I need help with the last question of a homework problem. I am given: P(A1) = 0.23, P(A2) = 0.26, P(A3) = 0.29, P(A1 ∩ A2) = 0.08, P(A1 ∩ A3)...

    Started by Kromey‎, 09-23-2015 10:31 PM
    • Replies: 3
    • Views: 226
    09-24-2015, 06:48 PM Go to last post
  13. Probability for a Two-dimensional Discrete random variable

    Hi all, I hope someone can help me a bit facing this problem. I have many item samples from a database (let's say 1000 for example) with two...

    Started by NachoPal‎, 09-24-2015 10:43 AM
    • Replies: 1
    • Views: 134
    09-24-2015, 11:08 AM Go to last post
  14. Two events meeting

    Hello everyone, I have a question regarding two events that take place randomly over a certain time period and meet. A similar problem would be...

    Started by Bbehrouz‎, 09-23-2015 11:09 AM
    probability, probability theory, stochastic
    • Replies: 4
    • Views: 149
    09-23-2015, 12:36 PM Go to last post
  15. properties of strictly stationary martingale difference sequence

    hey guys, I couldnt find a similar thread, so I decided to post my problem... Im in a time series setting: lets describe a sequence \epsilon_t,...

    Started by snoggla‎, 09-22-2015 10:07 AM
    • Replies: 0
    • Views: 202
    09-22-2015, 10:07 AM Go to last post
  16. Determine distribution and parameters

    I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with...

    Started by trinker‎, 09-21-2015 03:02 PM
    data generation, distribution
    • Replies: 5
    • Views: 210
    09-21-2015, 09:13 PM Go to last post
  17. Probability

    Can someone please help me with this?

    Started by Kadian‎, 09-19-2015 03:15 PM
    • Replies: 1
    • Views: 260
    09-21-2015, 03:55 AM Go to last post
  18. conditional binomial is a poisson distribution

    Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

    Started by exuberant‎, 12-24-2010 08:28 AM
    • Replies: 12
    • Views: 12,835
    09-17-2015, 12:31 AM Go to last post
  19. Statistics homework

    Hello, I am doing an introductional statistics unit in my first semester at uni the moment. I have a question to do and I have tried it for several...

    Started by Novacaine‎, 09-12-2015 10:48 PM
    • Replies: 3
    • Views: 431
    09-16-2015, 11:34 PM Go to last post
  20. Algebra with random variables

    I've done something strange, potentially bad, and i just wanted to check how bad. So i have the p.d.f of waiting time as: ...

    Started by Prometheus‎, 09-15-2015 10:43 AM
    • Replies: 3
    • Views: 302
    09-16-2015, 08:40 AM Go to last post
  21. Correlation coefficient and Expected Value

    Hi there, I'm doing an introductory statistics course and I'm having a little trouble with one of the questions. I am supposed to find out what...

    Started by purpleturtle‎, 09-15-2015 10:21 AM
    • Replies: 0
    • Views: 129
    09-15-2015, 10:21 AM Go to last post
  22. Bayes' Rule with Random Variables

    Hello! I'm having so much trouble trying to figure out how to do part (b) of the following problem: The probability that any child in a certain...

    Started by jumblebee‎, 09-14-2015 04:53 PM
    • Replies: 0
    • Views: 225
    09-14-2015, 04:53 PM Go to last post
  23. How to calculate how often a specific combination occurs in random design?

    Hi everybody, I hope someone can help me out! We designed an experiment in which 24 short clips are shown to particpants. These clips belong to...

    Started by Funmath‎, 09-11-2015 09:15 AM
    • Replies: 7
    • Views: 297
    09-11-2015, 10:56 AM Go to last post
  24. A bet between a buddy and I regarding the lottery

    Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

    Started by metamologist‎, 09-02-2015 07:48 PM
    • Replies: 8
    • Views: 670
    09-08-2015, 11:23 AM Go to last post
  25. Probability of many coin flips coming up heads 65% etc.

    Hello, I am wondering how to calculate what the probability would be of flipping a coin, say, 250 times and having it come up heads 65% of the time....

    Started by Logangus‎, 08-27-2015 01:23 AM
    • Replies: 4
    • Views: 451
    09-07-2015, 02:32 PM Go to last post
  26. Homework help

    Hi! I struggle really with statistics, probability theory and math in general, its really hard for me to understand and figure out by myself the...

    Started by wik111‎, 09-05-2015 05:31 AM
    • Replies: 2
    • Views: 331
    09-05-2015, 02:44 PM Go to last post
  27. stats homework

    A car manufacturer takes an average of 17.5 hours to construct a car. This includes time for stamping, welding, painting, assembly and inspections....

    Started by skitdemon‎, 09-01-2015 09:22 PM
    • Replies: 1
    • Views: 334
    09-02-2015, 12:50 AM Go to last post
  28. Probability Density Function of the derivative of a stochastic process

    Dear all; What is the expression of the PDF of the derivative of a stochastic process? My problem is completely general and theoretical, so, let's...

    Started by Bahi‎, 08-31-2015 06:45 AM
    derivatives, pdf, stochastic processes
    • Replies: 0
    • Views: 291
    08-31-2015, 06:45 AM Go to last post
  29. help plzzzz

    A national grocer's magazine reports the typical shopper spends eight minutes in line waiting for checkout. A sample of 24 shoppers at the local...

    Started by saima1‎, 08-31-2015 12:55 AM
    • Replies: 0
    • Views: 221
    08-31-2015, 12:55 AM Go to last post
  30. Question Prior probability distribution for k [a;b]

    Hi folks. I've a question. Let k be a parameter which must be estimated. It lies within the interval , a and b being finite real numbers. ...

    Started by lotharson‎, 08-30-2015 04:29 PM
    • Replies: 1
    • Views: 191
    08-30-2015, 06:36 PM Go to last post
  31. Every one says I am wrong, how can I be wrong?

    P(A)/x=(1/52)/t1 P(A)/y=σ=0_1/t2 x=52 y=f(^x) t1=continuos time

    Started by the box‎, 08-29-2015 03:35 AM
    • Replies: 1
    • Views: 276
    08-29-2015, 10:42 AM Go to last post
  32. Talking Probability problem

    A Committee consist of 8 men and 5 women. 1)in how many ways the group consisting of 4 members can be seleceted 2)in how many group will contain...

    Started by Mahesh mk‎, 08-28-2015 03:18 AM
    • Replies: 0
    • Views: 228
    08-28-2015, 03:18 AM Go to last post
  33. Newbie here, would appreciate some help.

    Hey guys. First post here and it's a bit basic so sorry about that. I have created an analogy to the problem I have. Say I have 8 balls, 4 of...

    Started by Everybody's fool‎, 08-26-2015 02:05 PM
    • Replies: 5
    • Views: 383
    08-27-2015, 02:15 PM Go to last post
  34. Raw moments of 3-parameter Weibull distribution

    Hi, I know that the formula for computing the raw moments of 2-parameter Weibull distribution is: Mu'n=b^n*Gamma(1+n/c), where b and c are scale...

    Started by mehdi_m990‎, 08-25-2015 02:46 AM
    moments, weibull
    • Replies: 2
    • Views: 209
    08-26-2015, 12:37 AM Go to last post
  35. Help Settle and Argument re: Chance of Failure in Fantasy Football

    Hi, all! I'm new, so please accept my apologies in advance for... whatever. So here's the question. In a fantasy football league, there are...

    Started by nieltown‎, 08-25-2015 09:57 AM
    independent, probability, stupid
    • Replies: 11
    • Views: 315
    08-25-2015, 12:16 PM Go to last post
  36. Density probability of a normal distribution at a point in a CASIO calculator

    I do not understand the utility of calculating the density probability in a point in the case of a continuous variable (for example in the case of...

    Started by PCouper‎, 08-24-2015 12:51 PM
    • Replies: 4
    • Views: 244
    08-25-2015, 06:35 AM Go to last post
  37. Probability of goals in a football match?

    I am trying to work out the probability of teams scoring a goal in a football match. Obviously there are many factors to consider, and the...

    Started by mattadams84‎, 08-23-2015 10:44 AM
    football, goal, probability, statistical analysis
    • Replies: 6
    • Views: 339
    08-24-2015, 12:59 PM Go to last post
  38. Probability & Network Theory

    Hey Everyone, new to this forum and studying network/graph theory on my own. Math has never been my strong point, and I need help with how the...

    Started by jwu013‎, 08-20-2015 08:37 PM
    • Replies: 3
    • Views: 303
    08-22-2015, 07:06 PM Go to last post
  39. probability of observation

    In a hospital, births occur randomly at an average rate of 2 births per hour. Calculate the probability of observing 1. 3 births in a given...

    Started by Rana Riaz Ahmed Anjum‎, 08-14-2015 01:32 AM
    • Replies: 2
    • Views: 710
    08-20-2015, 09:38 AM Go to last post
  40. formula for False Alarm Rate and Power of Detection based on Median Run Length

    Hi, What is the formula for False Alarm Rate and Power of Detection based on Median Run Length?

    Started by Fam‎, 08-18-2015 03:53 AM
    mrl far detection power
    • Replies: 0
    • Views: 258
    08-18-2015, 03:53 AM Go to last post
  41. Contribution to a Probability

    Hi All, I'm sorry that this question is trivial but I'm afraid I've forgotten how to solve simple probability and statistics problem :( Say...

    Started by edp‎, 08-18-2015 12:46 AM
    • Replies: 0
    • Views: 150
    08-18-2015, 12:46 AM Go to last post
  42. Weibull/Normal Distribution Hazard Rate Calculation

    Hi, so I've been searching the web a while for a real example or procedure to get hazard rates from actual data but all I can come up with are...

    Started by howe0168‎, 08-13-2015 03:27 PM
    weibull distribution
    • Replies: 0
    • Views: 161
    08-13-2015, 03:27 PM Go to last post
  43. Pagano solution chap 6

    Does anyone have pagano solution book. I just want to know the answers of chap 6 excercise 9 and 15. a b, c d answers. Thanks.

    Started by Maryam2008‎, 08-13-2015 12:44 AM
    • Replies: 0
    • Views: 170
    08-13-2015, 12:44 AM Go to last post
  44. Help in solving a question

    Hello everyone, I am working on some exercise questions from probability. I am stuck at this question. Can somebody help me to solve this. I would...

    Started by Aleem‎, 08-01-2015 04:09 PM
    • Replies: 3
    • Views: 417
    08-13-2015, 12:33 AM Go to last post
  45. help with homework qouestion

    suppose that an admission test at a certain college is designed so that the probability of passing it is 60%. The probability that among 20...

    Started by TODZAA‎, 08-08-2015 08:56 AM
    • Replies: 2
    • Views: 351
    08-10-2015, 03:35 PM Go to last post
  46. 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...

    Started by ashraf‎, 08-08-2015 01:08 AM
    • Replies: 1
    • Views: 200
    08-08-2015, 02:41 AM Go to last post
  47. Layperson with a question

    Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

    Started by Phi618‎, 07-20-2015 07:11 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 959
    08-06-2015, 09:10 PM Go to last post
  48. compromise between efficiency and accuracy

    Hi! Not sure I post in the right place, but maybe you can help, and some probabilities can be introduced in discussion for the following problem:...

    Started by sorin‎, 08-06-2015 10:36 AM
    random sample
    • Replies: 0
    • Views: 162
    08-06-2015, 10:36 AM Go to last post
  49. Noob question about "combined" probabilities.

    Hello! Sorry for my poor english, Im from Argentina. And sorry too if Im in the wrong place. I need some knowledged about stats and this forum...

    Started by Capanegra‎, 07-27-2015 08:26 AM
    compare proportions
    • Replies: 10
    • Views: 481
    08-04-2015, 09:16 AM Go to last post
  50. Questions on likelihood and MLE, help please!

    Hey guys, got few questions on likelihood and MLE stuff and hope to get some help and advises on them please. Question Pr(X=x|p) = ((1-p)^(x-1))...

    Started by jamessuh36‎, 08-04-2015 02:31 AM
    • Replies: 0
    • Views: 152
    08-04-2015, 02:31 AM Go to last post
  51. What is the probability people are forecasting correctly with standard spreadsheets?

    It seems that many people are using standard spreadsheets to forecast, getting correlation coefficients, etc. However I decided I needed to write my...

    Started by Swayseker‎, 08-03-2015 08:38 AM
    forecast error, probability
    • Replies: 0
    • Views: 153
    08-03-2015, 08:38 AM Go to last post
  52. Hypergeometric distribution appears to have hidden problems

    When I was writing a computer program to calculate hypergeometric distributions probabilities I had some funny results. This is because I just used...

    Started by Swayseker‎, 08-01-2015 12:57 PM
    conditions, hypergeometric, probability
    • Replies: 2
    • Views: 215
    08-03-2015, 08:15 AM Go to last post
  53. Calculate the moment generating function

    Hello, I can not calculate the generating function of X / Y = y . E (e ^ (-t X / Y = y)). (see attached file) Thanks so much.

    Started by Alex2015‎, 08-03-2015 08:10 AM
    • Replies: 0
    • Views: 118
    08-03-2015, 08:10 AM Go to last post
  54. Probability of an accident

    Looking for help with this problem: A train will pass the same point every 7.5 minutes everyday of the week from 4am to 8am. There are 3380...

    Started by JacQue DuBois‎, 07-28-2015 03:29 PM
    • Replies: 6
    • Views: 432
    08-01-2015, 12:24 PM Go to last post
  55. Expectation of truncated normal X conditional on truncated normal Y

    I am trying to derive: E(X|a \leq Y \leq b) where c \leq X \leq d , X and Y are (doubly truncated) Gaussians with the same mean and different...

    Started by CLP_PS‎, 07-27-2015 06:35 PM
    • Replies: 2
    • Views: 312
    07-28-2015, 10:37 AM Go to last post
  56. Help with Bayesian question please

    Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

    Started by jamessuh36‎, 07-22-2015 08:31 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 48
    • Views: 1,201
    07-27-2015, 09:48 AM Go to last post
  57. Need help with 2x2 table

    Hey guys, Struggling to put this question into a 2x2 table. Any help would be appreciated. A new drug has been developed to manage early...

    Started by Hark‎, 07-26-2015 08:29 PM
    • Replies: 1
    • Views: 219
    07-27-2015, 05:35 AM Go to last post
  58. Probability of 20 people drawing the same card 9 or more times in a deck of cards.

    Hello! This is my first post so apologies if I'm out of line :-S! I've looked EVERYWHERE and haven't found a problem that I an use as a model... I've...

    Started by imackenzie‎, 07-25-2015 12:35 PM
    • Replies: 2
    • Views: 262
    07-26-2015, 06:58 AM Go to last post
  59. Help is needed for a probability question

    Homework needs to be done during the weekends. Question is A box contains 2 red balls and 4 yellow balls. If a ball is randomly drawn from the...

    Started by lcaine96‎, 07-24-2015 11:51 AM
    • Replies: 2
    • Views: 200
    07-24-2015, 12:29 PM Go to last post

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