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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: 11,029
    09-30-2005, 09:44 AM Go to last post
  1. Need help with geometric pmf

    Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

    Started by Dichotomous‎, Today 11:34 AM
    • Replies: 2
    • Views: 70
    Today, 01:26 PM Go to last post
  2. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

    i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

    Started by spunky‎, Yesterday 04:53 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 336
    Yesterday, 08:59 PM Go to last post
  3. Comparing proportions

    Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

    Started by blue11‎, Yesterday 01:35 PM
    • Replies: 0
    • Views: 56
    Yesterday, 01:35 PM Go to last post
  4. Homework help with conditional probability distribution

    Hi, I was wondering if I could get some help with this homework problem. We are given that X~U(0,1) and conditional distribution of Y|X=x is...

    Started by econnerd‎, 09-16-2014 05:55 PM
    • Replies: 1
    • Views: 151
    09-17-2014, 12:54 AM Go to last post
  5. Astronomer's estimate

    I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

    Started by debaprosad‎, 09-15-2014 11:46 AM
    • Replies: 3
    • Views: 143
    09-16-2014, 03:59 PM Go to last post
  6. Chi square test: how to solve this one ?

    A dentist observed that most of the patients have cavities in their teeths at the right-side of their mouth. (see data: observed values) The...

    Started by IntoTheLibrary‎, 09-16-2014 08:59 AM
    • Replies: 0
    • Views: 109
    09-16-2014, 08:59 AM Go to last post
  7. Tricky probability problem

    Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a...

    Started by Probprob‎, 09-15-2014 10:19 AM
    difficult, probability
    • Replies: 1
    • Views: 122
    09-16-2014, 05:24 AM Go to last post
  8. 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...

    Started by ArtK‎, 09-06-2014 08:47 AM
    • Replies: 11
    • Views: 410
    09-08-2014, 11:43 PM Go to last post
  9. Probability of Unconventional Food Item Alleviating Medical Problem Multiple Times

    For about 2 years, a medical problem has more or less repeated, as follows: The problem normally lasts approximately 3 weeks and then goes away...

    Started by old geezer‎, 09-08-2014 02:50 PM
    correlation, improvement, medical problem, treatment
    • Replies: 0
    • Views: 83
    09-08-2014, 02:50 PM Go to last post
  10. Mathematical intuition for variance

    One explanation to "Why do we square the deviations" is.. "The sum of the square deviations of any set of observations from their mean is the...

    Started by jmlc‎, 09-08-2014 10:41 AM
    variance
    • Replies: 1
    • Views: 79
    09-08-2014, 10:59 AM Go to last post
  11. Help with son's probability question

    Hi Folks, I'm new here. Haven't studied probability in 30 years and trying to help my son with his homework. In the attachments is the question,...

    Started by mackbri‎, 09-04-2014 04:07 PM
    • Replies: 3
    • Views: 206
    09-06-2014, 03:39 AM Go to last post
  12. if z-value is a negative number, how can i calculate the Probability?

    Hello guys, :) I have an important question I want to ask. I have already searched the web and my statistics book but I can not find the answer :(...

    Started by katte‎, 09-04-2014 03:42 PM
    normal distribution, probability, z score, z value, z-value
    • Replies: 2
    • Views: 188
    09-04-2014, 10:14 PM Go to last post
  13. 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...

    Started by ArtK‎, 09-04-2014 05:12 AM
    • Replies: 0
    • Views: 116
    09-04-2014, 05:12 AM Go to last post
  14. probability poisson distributed

    hi can somebody help me with this question please.

    Started by arkeed178‎, 08-29-2014 06:52 AM
    • Replies: 5
    • Views: 489
    09-01-2014, 10:25 AM Go to last post
  15. Non central Chi square distribution and approximations Matlab

    Hello! I have a problem with the computation of a chi squared distribution in Matlab. I have a quadratic form : y' Px y, this form has a non...

    Started by bidou8601‎, 08-29-2014 08:39 AM
    • Replies: 3
    • Views: 189
    08-29-2014, 04:17 PM Go to last post
  16. Traffic light probability question.Need help!!

    Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

    Started by Shashank Prasad‎, 06-27-2014 04:22 PM
    • Replies: 2
    • Views: 217
    08-29-2014, 11:10 AM Go to last post
  17. Computing probability

    fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

    Started by studentbelg‎, 08-28-2014 11:47 AM
    • Replies: 1
    • Views: 165
    08-29-2014, 03:47 AM Go to last post
  18. Drawing variates from this density function

    Hi, I have derived the following probability density function, which I would like to draw random variates from as part of a Gibbs sampling step: ...

    Started by graeme‎, 08-21-2014 03:41 PM
    • Replies: 2
    • Views: 152
    08-28-2014, 07:01 PM Go to last post
  19. Poisson proces and binomial

    I'm trying to find the distribution of the number Y of arrivals in the timeinterval \subset where X(t) is number of arrivals in a poissonproces...

    Started by JesperHP‎, 08-28-2014 09:05 AM
    • Replies: 2
    • Views: 106
    08-28-2014, 10:15 AM Go to last post
  20. changing the frequency distribution with out the changing the shape of the disti

    i have frequency table of wind speeds from a measurement site and now i want to use that wind speed frequency table to find out wind speed at a...

    Started by codenamenikky‎, 08-15-2014 01:24 PM
    • Replies: 5
    • Views: 276
    08-25-2014, 05:28 PM Go to last post
  21. 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...

    Started by Arnoud‎, 08-22-2014 04:59 AM
    • Replies: 1
    • Views: 132
    08-22-2014, 12:25 PM Go to last post
  22. Question Probability that Bernoulli p-parameter is greater than some value, given N samples?

    Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

    Started by hansel‎, 08-11-2014 05:18 PM
    bernoulli, confidence intervals, parameter estimation
    • Replies: 5
    • Views: 262
    08-14-2014, 01:52 PM Go to last post
  23. Multi-level Bayes

    I guess that this is a multi level Bayes problem but there maybe a better technical name for it that I am not aware. Three jars contain tokens of...

    Started by TedR‎, 08-13-2014 11:50 AM
    bayes
    • Replies: 2
    • Views: 156
    08-13-2014, 12:35 PM Go to last post
  24. Question exponential and deterministic random variable mix

    Assume that there is a Poisson random process which has a rate of λ that produce samples which has an exponentially distributed inter-arrival times,...

    Started by PrasadP‎, 08-12-2014 07:42 PM
    • Replies: 3
    • Views: 220
    08-13-2014, 07:28 AM Go to last post
  25. Set Completion Problem for a Set of Collectable Objects

    I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

    Started by Eyks‎, 08-09-2014 01:47 AM
    • Replies: 8
    • Views: 234
    08-10-2014, 05:09 AM Go to last post
  26. Given an Average for Drawing 6 Times, What Are the Odds When Drawing Once?

    Suppose we draw 6 times, with replacement, from a deck of cards with four suits. We do not know how many cards of each suit there are, nor how many...

    Started by Eyks‎, 08-09-2014 06:29 PM
    • Replies: 1
    • Views: 147
    08-10-2014, 04:47 AM Go to last post
  27. Statistically different tops for 2 parabolas with non-normal distributed data

    For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

    Started by rob1‎, 07-30-2014 05:32 PM
    • Replies: 8
    • Views: 416
    08-08-2014, 11:20 AM Go to last post
  28. a question about discrete RV

    hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

    Started by avsha43‎, 08-07-2014 03:56 PM
    • Replies: 11
    • Views: 262
    08-08-2014, 07:38 AM Go to last post
  29. Drawing tokens from a bag - probability of getting 2(a) out of 3 draws

    EDIT: Please see my last post for my latest revelation/question regarding this problem! Hi all, first time poster here... I'm creating a...

    Started by bgm1961‎, 08-06-2014 11:43 AM
    bag, drawing, outcomes
    • Replies: 3
    • Views: 209
    08-07-2014, 12:08 PM Go to last post
  30. Ploting Positions from Peak Over Thresold Series

    Hello. I have a little confusing with some aspect related to the Peak Over Thresold Series and differencing the methodology of analysis from that...

    Started by Jpalbae‎, 08-06-2014 10:54 AM
    ploting positions, pot-series, probability
    • Replies: 0
    • Views: 96
    08-06-2014, 10:54 AM Go to last post
  31. Building confidence intervals using Coefficient of variation

    Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

    Started by jfca283‎, 08-05-2014 10:59 AM
    • Replies: 7
    • Views: 227
    08-05-2014, 12:51 PM Go to last post
  32. Probability Math Homework

    If someone could please help. I got the first part of question correct, but cannot figure out how to calculate the second part of the question. ...

    Started by emily8319‎, 07-31-2014 02:03 PM
    • Replies: 2
    • Views: 244
    08-01-2014, 10:47 AM Go to last post
  33. Interpretation histogram - normal versus logged variable

    For the histogram of my variable 'ambidexterity,' I predicted the data to have something like two normal distributions for this variable, one at the...

    Started by rob1‎, 07-31-2014 11:25 AM
    • Replies: 1
    • Views: 165
    07-31-2014, 11:49 AM Go to last post
  34. Looking for an elegant mathematical expression

    Hi to you all, i am new at this forum and i am glad there is such. Problem description suppose i am playing two seperate games (independently!)...

    Started by yaron‎, 07-30-2014 09:15 AM
    • Replies: 2
    • Views: 163
    07-31-2014, 02:46 AM Go to last post
  35. Can't justify 'correct' answer

    I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

    Started by Brother Maynard‎, 07-27-2014 09:05 PM
    • Replies: 2
    • Views: 193
    07-29-2014, 07:29 PM Go to last post
  36. Cumulative probability formula - majority of trials

    I posted a question below (28 June) on forward error correction which got no replies because it was too naive. I've found the answer I think which is...

    Started by crofter‎, 07-29-2014 06:51 AM
    • Replies: 0
    • Views: 125
    07-29-2014, 06:51 AM Go to last post
  37. Question Logistic Regression Problem

    Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

    Started by rbenzoj‎, 07-22-2014 01:19 PM
    correlation, logistic regression
    • Replies: 5
    • Views: 348
    07-28-2014, 09:57 AM Go to last post
  38. Number serviceable at given time

    If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

    Started by brif‎, 07-24-2014 07:46 AM
    • Replies: 12
    • Views: 334
    07-28-2014, 08:40 AM Go to last post
  39. Question about well-suited poker hand

    Hi, I have the following question: A peculiar deck of playing cards is like a regular deck, but has five suits: spades, hearts, diamonds, clubs,...

    Started by Turtles123‎, 07-24-2014 03:25 PM
    • Replies: 2
    • Views: 249
    07-27-2014, 09:26 AM Go to last post
  40. Probability of sequences having 1-4 distinct numbers

    This is more of combinations problem, but I need to count the number of ways in order to get the probabilities. I would like to find the number...

    Started by Schoolman‎, 07-25-2014 08:10 AM
    • Replies: 1
    • Views: 159
    07-27-2014, 02:43 AM Go to last post
  41. Stochastic Integral

    Hi there, I created an account here trying to get some help on my problem. I'm really desperate as I'm going to need this for my work on my...

    Started by JBrettas‎, 07-17-2014 10:37 PM
    • Replies: 4
    • Views: 327
    07-23-2014, 06:34 PM Go to last post
  42. Probability based on multiple pieces of information

    It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

    Started by bobbytables‎, 07-20-2014 10:25 PM
    • Replies: 9
    • Views: 339
    07-22-2014, 12:57 PM Go to last post
  43. Normal and standard distribution question

    I have X \sim N(0,1) and Y \sim N(\mu,\sigma^2) Apparently then Y =\sigma X + \mu I can't quite see how, and can't find anything on the...

    Started by Prometheus‎, 05-25-2014 08:50 AM
    • Replies: 6
    • Views: 387
    07-21-2014, 11:47 AM Go to last post
  44. Group Assortment Measure

    Hi I need a formula that returns a value representative of the amount of ‘assortment’ a group shows. The groups are made up of individuals, all of a...

    Started by josh1‎, 07-19-2014 10:53 AM
    • Replies: 0
    • Views: 160
    07-19-2014, 10:53 AM Go to last post
  45. PDF of (nearly) collinear variables

    My question is motivated by a problem with estimation by maximum likelihood. In simple terms, I want to estimate a parameter \beta and have three...

    Started by Sam Vimes‎, 07-18-2014 07:25 AM
    collinearity, likelihood function, probability distribution
    • Replies: 1
    • Views: 193
    07-18-2014, 10:46 AM Go to last post
  46. Probability of a sequence....

    HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

    Started by MikCss‎, 05-29-2014 07:44 AM
    • Replies: 5
    • Views: 458
    07-12-2014, 06:41 PM Go to last post
  47. Need some help with probability and dice

    Hi guys, I'm making a board game and ran into some probability problems with dice. I use custom dice (green, blue, red, and yellow). The same...

    Started by Tucker‎, 07-09-2014 05:16 PM
    • Replies: 3
    • Views: 289
    07-10-2014, 03:10 AM Go to last post
  48. Exam Question / need help

    3-Suppose that you are in charge of marketing airline seats for a major airline company. Four days before the flight you have 12 seats remaining on...

    Started by duffann‎, 06-25-2014 01:36 AM
    • Replies: 2
    • Views: 335
    07-09-2014, 03:15 PM Go to last post
  49. How do you calculate and relate odds from two different experiments?

    a) Lets say I have a sack with 119 white balls and 1 black one. Pw=119/120 almost 99.17 % b) A guy called John comes and pick randomly picks a...

    Started by bghiggeri‎, 07-08-2014 04:27 PM
    • Replies: 0
    • Views: 213
    07-08-2014, 04:27 PM Go to last post
  50. Uniform Distribution - probabilities

    Hi guys, I am trying to solve an exercise but it seems to bem somehow strange. It is an experiment where A believes that men are bigger than women...

    Started by mathstats‎, 07-08-2014 03:15 AM
    uniform distribution
    • Replies: 2
    • Views: 189
    07-08-2014, 09:01 AM Go to last post
  51. IP probability question

    hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example 234.32.135.7. now, my question is, what is the...

    Started by uv_h‎, 06-06-2014 09:48 AM
    probability
    • Replies: 6
    • Views: 464
    07-08-2014, 07:12 AM Go to last post
  52. Would love some assistance with understanding this puzzling probability "game"

    Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

    Started by Habanero‎, 07-05-2014 12:25 AM
    • Replies: 3
    • Views: 332
    07-05-2014, 06:18 PM Go to last post
  53. Question Probit regression - Interpretation of marginal effects of IVs in log/percentage form

    Dear talkstats-community, I already spent hours on websearch for an answer on a question I have regarding the interpretation of marginal effects...

    Started by MSCBUS‎, 07-03-2014 06:54 AM
    marginal effects, marginal probability, probit regression
    • Replies: 1
    • Views: 246
    07-04-2014, 10:56 AM Go to last post
  54. What are the chances?

    Question: How many times must A occur in order for C to occur 3 times and D to occur once? Every time A occurs, there is a 1 in 2,500 chance that...

    Started by timmah507‎, 06-21-2014 02:33 PM
    • Replies: 1
    • Views: 292
    07-02-2014, 05:58 AM Go to last post
  55. Binomial distribution ! Need help!

    Hi, plz tell me if method to solve these question is correct or not! q)In a call centre 180 calls are received at random over a period of 12...

    Started by Shashank Prasad‎, 06-28-2014 11:05 AM
    • Replies: 0
    • Views: 252
    06-28-2014, 11:05 AM Go to last post
  56. Poisson distribution!! Need help

    Hi, Need help in solving few poisson distribution questions q)A dealer receives hard disks made by a certain manufacturer who on an average gives...

    Started by Shashank Prasad‎, 06-28-2014 10:59 AM
    • Replies: 0
    • Views: 142
    06-28-2014, 10:59 AM Go to last post
  57. Probability and forward error correction by parallel transmission

    I need a formula to express the probability of being able to correct single digit errors in a transmitted string of digits by transmitting the string...

    Started by crofter‎, 06-28-2014 08:27 AM
    • Replies: 0
    • Views: 258
    06-28-2014, 08:27 AM Go to last post
  58. Need help to solve Probability question!

    Hi, Need help to solve this probability question! A supplier of company X makes on average 5 defective pieces.The company accepts a sample if...

    Started by Shashank Prasad‎, 06-27-2014 04:14 PM
    • Replies: 0
    • Views: 105
    06-27-2014, 04:14 PM Go to last post
  59. Please help, need to find a book

    Dear friends, I need to find the textbook where the exercises on the photo (attached) come from. It's very urgent. Please help. Thank everybody.

    Started by East31‎, 06-25-2014 10:56 PM
    • Replies: 9
    • Views: 441
    06-26-2014, 10:26 PM Go to last post
  60. Simple Probability Question

    OK, so I am wondering about something and am not good with probability, but maybe someone here has the answer You have a die with only 4 sides,...

    Started by jp023‎, 06-25-2014 10:02 AM
    dice, math, probability, problem, question
    • Replies: 2
    • Views: 378
    06-25-2014, 11:03 AM Go to last post

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