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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: 30,208
    09-30-2005, 09:44 AM Go to last post
  1. Proof of probability of being chosen

    This problem is from Mathematical Statistics with Resampling and R, chapter 1. The answer in the back of the book just gives n/N which is the result...

    Started by gaeborak‎, 08-13-2013 03:44 PM
    • Replies: 3
    • Views: 3,235
    08-13-2013, 10:08 PM Go to last post
  2. Card draw and joint probability

    I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

    Started by Lunaticfringe‎, 08-04-2013 06:09 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,357
    08-12-2013, 03:34 PM Go to last post
  3. Regarding joint Probability distribution

    Ha All, I have three random variable X,Y and Z, which is related to each other by given relation: Z=X+Y. I want to calculate joint pdf of...

    Started by bhupy‎, 08-12-2013 05:05 AM
    • Replies: 1
    • Views: 1,657
    08-12-2013, 09:31 AM Go to last post
  4. Normal variable day-week multiplication?

    Hello Statisticians! I would really appreciate help with this: The mean number of lemonade glasses sold in a day is 15, standard deviation is...

    Started by Lazyeconomist‎, 08-11-2013 10:41 AM
    • Replies: 2
    • Views: 1,374
    08-12-2013, 02:35 AM Go to last post
  5. Outcomes of coin toss with restrictions?

    Hey guys, Apologies if this is in the wrong area. I'm busy with a non academic project at the moment, and I need to determine the number of...

    Started by GTG‎, 08-08-2013 06:37 AM
    • Replies: 8
    • Views: 2,178
    08-10-2013, 10:49 AM Go to last post
  6. Going crazy over probability problem

    I'm working through the book Probability Demystified, which has been an okay refresher on basic probability, but is known to contain a lot of errors....

    Started by gaeborak‎, 08-09-2013 11:43 AM
    • Replies: 2
    • Views: 1,709
    08-09-2013, 03:55 PM Go to last post
  7. Finding the posterior distribution

    Started by TrueTears‎, 08-08-2013 08:26 AM
    • Replies: 0
    • Views: 1,169
    08-08-2013, 08:26 AM Go to last post
  8. Poisson Conditional Probability Question

    Hey Guys I've been racking my brain for ages trying to solve this but I can't seem to get the last step. The question is, given 0<u<t ,...

    Started by JHoop‎, 08-07-2013 09:52 PM
    conditional, poisson
    • Replies: 1
    • Views: 1,445
    08-07-2013, 11:46 PM Go to last post
  9. Probability question

    I have what some would probably think is quite a simple calculation that is proving very challenging to me. Let's say I have five tennis matches and...

    Started by dirtyleeds‎, 08-03-2013 02:54 PM
    • Replies: 2
    • Views: 1,880
    08-05-2013, 02:03 PM Go to last post
  10. Probability of irregular 10-sided die

    I've got an odd question here: I've got a 10-sided die with sides labeled as such: -1, 0, 0, 0, 0, 1, 1, 1, 1, 2 Thus, the odds for a single die...

    Started by cypher_zero‎, 08-05-2013 11:01 AM
    10-sided, d10, dice, irregular dice, probability distribution
    • Replies: 1
    • Views: 1,874
    08-05-2013, 11:05 AM Go to last post
  11. Question regarding probability of evidence and Baye's rule

    Hi Everyone, I am a newbie in probability theory and following is my question: Consider we have two binary random variables A and B. B is...

    Started by stat_newbie‎, 08-04-2013 11:47 PM
    • Replies: 0
    • Views: 876
    08-04-2013, 11:47 PM Go to last post
  12. Chance of an Occurance

    ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

    Started by cdurta‎, 07-28-2013 06:46 PM
    • Replies: 8
    • Views: 2,961
    07-30-2013, 11:49 PM Go to last post
  13. how did Komogorov's Probability axioms became axioms?

    i was reviewing some of my notes on real analysis yesterday and started thinking about something my prof said the first day. he commented on how...

    Started by spunky‎, 07-30-2013 02:31 PM
    • Replies: 5
    • Views: 3,217
    07-30-2013, 05:46 PM Go to last post
  14. Lightbulb Probability Question

    Working through an sample paper for an upcoming exam and I've been struggling with the following stock trading problem "A total of 576 such...

    Started by Charlie Day‎, 07-29-2013 03:52 PM
    • Replies: 7
    • Views: 1,755
    07-30-2013, 11:17 AM Go to last post
  15. Box with balls that change colors

    Hello ! I'm stuck with this problem Suppose that I have a box that contains n balls, where i are white, the others (n-i) are black. if I get a...

    Started by Nodame‎, 07-29-2013 08:33 PM
    • Replies: 1
    • Views: 1,876
    07-30-2013, 12:55 AM Go to last post
  16. High/low between 1-10 game odds

    I'm trying to figure out the odds for a game where a number between 1 and 10 are drawn randomly, and the player must guess if the next number is...

    Started by winneroo‎, 07-28-2013 03:46 AM
    game, high, low, probability
    • Replies: 2
    • Views: 2,243
    07-28-2013, 11:29 AM Go to last post
  17. counting probability

    i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

    Started by zxcvbnm123‎, 07-24-2013 03:03 PM
    • Replies: 5
    • Views: 2,083
    07-28-2013, 09:27 AM Go to last post
  18. Conditional probability inequality

    Let f be an arbitrary function, let g be a strictly increasing function and let h be strictly convex. I'm trying to prove the following, which seems...

    Started by Leo Simon‎, 07-26-2013 07:14 PM
    • Replies: 3
    • Views: 2,653
    07-28-2013, 08:29 AM Go to last post
  19. arrangement problem

    a class has 10 students,every student is given 3 mobile phones with 3 sim for free communication... for every sim ,a set of duplicate sim is...

    Started by jyoti‎, 07-26-2013 02:11 AM
    • Replies: 0
    • Views: 1,482
    07-26-2013, 02:11 AM Go to last post
  20. Question on stopping times

    I wonder if anyone can help me with this please: Suppose i have an increasing sequence of stopping times \rho_{n} which converges with...

    Started by natt010‎, 07-25-2013 06:17 AM
    • Replies: 0
    • Views: 1,177
    07-25-2013, 06:17 AM Go to last post
  21. 7 Balls in 7 Buckets

    Hi, Say I have 7 balls I can put in 7 different buckets. Define Xn to be the number of buckets with n balls. For instance X3 = 1 is the number of...

    Started by badmax‎, 07-24-2013 11:10 PM
    • Replies: 0
    • Views: 1,148
    07-24-2013, 11:10 PM Go to last post
  22. Exclamation Combinatorics

    Hey guys. I really struggle with combinatorics/permutations... It seems like I can't possibly translate a verbal question onto math. This mainly...

    Started by fiffette‎, 07-23-2013 04:52 PM
    • Replies: 1
    • Views: 1,840
    07-24-2013, 06:26 AM Go to last post
  23. Probably a simple problem

    This is a long question, so I'll put it in quotes. Sorry for the lame title, but I wasn't sure what else to call it. It's essentially a very basic...

    Started by ajstat‎, 05-17-2013 03:23 AM
    • Replies: 2
    • Views: 2,186
    07-23-2013, 02:03 AM Go to last post
  24. Student t Distribution

    Hi, I've been going over this question for a while now and can't get my head around it, I'm definitely more of a mechanics person so I had to cave in...

    Started by Stevec989‎, 07-21-2013 09:12 AM
    student t distribution
    • Replies: 1
    • Views: 1,807
    07-22-2013, 10:47 AM Go to last post
  25. Inquisitive son problem!

    Hi, I'm not sure if this is the right place to post but here goes... My son and myself have been building a quincunx machine as part of a project...

    Started by nosduha‎, 07-16-2013 03:01 PM
    • Replies: 5
    • Views: 1,844
    07-21-2013, 02:35 PM Go to last post
  26. Odds of successive outcomes with weighted probabilities

    Hello, I am a statistics and probabilities novice and I'm having trouble with this problem. I'll lay out an example: Team A and team B are playing...

    Started by hstrum‎, 07-17-2013 10:23 PM
    • Replies: 2
    • Views: 1,870
    07-19-2013, 01:06 AM Go to last post
  27. Binomial Distribution / Consecutive Odds Question

    Hi everyone, Looking to solve a 3 part problem. My answers to the first 2 parts agrees with the textbook answers, but I'm confused by the 3rd...

    Started by jschroeder5‎, 07-18-2013 06:18 PM
    • Replies: 0
    • Views: 5,432
    07-18-2013, 06:18 PM Go to last post
  28. Do I use Poisson distribution to solve this problem?

    A surveillance camera detects 30 persons every minute. What is the probability that there will be no detections in an interval of 7 seconds? Can...

    Started by jfromm‎, 07-16-2013 12:58 AM
    • Replies: 4
    • Views: 1,678
    07-17-2013, 03:04 PM Go to last post
  29. Having trouble figuring out this probability density function problem

    Determine the value of c such that the function f(x,y) = c(x+y) a) is a joint probability density function over the region 0 < x < 3 and x < y <...

    Started by jfromm‎, 07-16-2013 02:43 PM
    • Replies: 1
    • Views: 1,934
    07-16-2013, 02:48 PM Go to last post
  30. Understanding density functions

    Hello Let take for example the normal probability density function. How come the area underneath equals the probability of less than or equal to...

    Started by RorschachDK‎, 07-16-2013 02:40 PM
    • Replies: 0
    • Views: 1,636
    07-16-2013, 02:40 PM Go to last post
  31. Game Coding: Calculating The Stat Growth Chance Over Several Levels

    Hello! I'm working on a computer game, specifically character creation. The game uses an attribute growth system identical to the one in the Fire...

    Started by secv‎, 07-16-2013 09:59 AM
    level up, stat growth, video game
    • Replies: 7
    • Views: 2,076
    07-16-2013, 02:40 PM Go to last post
  32. Best unbiased estimator of a function of a estimator

    Hi, I'm having a small problem with the following problem: From the factorization theorem I know that \max{X_i}=X_{(n)} is a sufficient...

    Started by Tosha‎, 07-15-2013 08:52 AM
    • Replies: 2
    • Views: 1,735
    07-15-2013, 10:29 AM Go to last post
  33. Rats and lights and shocks and a probability question that is vexing me

    I study Pavlovian fear conditioning and have some data consistent with the possibility that a rats response to a stimulus (a 3 second light) that was...

    Started by dlwalke‎, 06-26-2013 03:54 PM
    • Replies: 3
    • Views: 1,486
    07-14-2013, 07:38 PM Go to last post
  34. Is it possible to generate a distribution curve only knowing the mean, min & max

    Can anyone tell me whether it is possible - and if so how - to generate a distribution graph with just three known values. The values I have are: ...

    Started by Michael Jeffries‎, 07-13-2013 02:51 AM
    • Replies: 1
    • Views: 2,432
    07-13-2013, 06:46 AM Go to last post
  35. A Problem on Joint Probability Distribution

    Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

    Started by kamekaze‎, 12-10-2010 12:52 PM
    • Replies: 4
    • Views: 4,386
    07-12-2013, 10:20 PM Go to last post
  36. Cool Using the normal probability distribution to approximate the binomial

    Hi everyone! I'm taking an online elementary stats course as a prerequisite. Even though my once-solid math skills are totally rusty seven years...

    Started by rubiamaha‎, 07-11-2013 06:41 PM
    • Replies: 2
    • Views: 3,484
    07-11-2013, 07:06 PM Go to last post
  37. Red face interpret conditional probabilities and inferring ratios

    Hi All First time here and its been a long time since I studied probability...was hoping someone could assist in the interpretation of some data I...

    Started by kmuz‎, 07-11-2013 01:54 AM
    bayesian, probability
    • Replies: 0
    • Views: 892
    07-11-2013, 01:54 AM Go to last post
  38. Consecutive outcomes of events

    I am trying to figure out the probability for not having consecutive like outcomes from a large sample and can't figure out where to begin. Say...

    Started by paintrain‎, 07-10-2013 08:42 PM
    combinations, probabilistic sampling, probability
    • Replies: 1
    • Views: 1,945
    07-11-2013, 12:08 AM Go to last post
  39. Need help for an exercise about Roulette - Variance calculation

    Hello, i'm working on a theoretical Roulette exercise. There are 37 numbers on the roulette, 18 are Red. A player is playing an amount B (his...

    Started by mascip‎, 07-06-2013 10:56 AM
    • Replies: 9
    • Views: 2,366
    07-10-2013, 03:19 AM Go to last post
  40. help w/puzzle

    Thnx thnx thnx

    Started by Needsomehelp‎, 07-09-2013 08:45 PM
    • Replies: 2
    • Views: 1,197
    07-09-2013, 11:06 PM Go to last post
  41. Problem about Gaussian process

    Hi everyone, I've been trying to solve an exercise that's driving me crazy, I'd be very glad if someone could help me. I have a Gaussian process...

    Started by hilf‎, 07-08-2013 03:11 PM
    • Replies: 2
    • Views: 1,457
    07-09-2013, 01:14 AM Go to last post
  42. Interpreting parameter estimates (ERGM)

    Hi anyone could help me with the following? How do I calculate and interpret departure from non-randomness or likelihood of such configuration...

    Started by KristinaMac‎, 06-25-2013 02:49 AM
    ergm, markov chain, monte carlo, parameter estimates, random graph
    • Replies: 1
    • Views: 2,398
    07-08-2013, 03:10 AM Go to last post
  43. Game probability problem

    Two armies of n attackers and m defenders do battle. If n=1, then there is 1 attacking die; if n=2 there are 2 attacking dice; if n \geq 3 there are...

    Started by GameGod‎, 05-28-2013 06:39 PM
    3 Pages
    1 2 3
    • Replies: 34
    • Views: 6,632
    07-08-2013, 12:43 AM Go to last post
  44. Dirichlet distribution

    I computed mean, variance and covariance of the Dirichlet distribution. To do so, I computed E, E and E. This is the first time I've dealt with...

    Started by Kiuhnm‎, 07-07-2013 05:09 AM
    dirichlet distribution
    • Replies: 2
    • Views: 1,398
    07-07-2013, 07:01 AM Go to last post
  45. please help me!!!thanks and godbless u always

    a) use normal approx P( x>810) = P ( z> (810-.73*1100)/(.73*.27*1100))=.4871 or 48.71% b) P (x<1030) = P(z<...

    Started by cathy_qt24‎, 07-07-2013 03:07 AM
    • Replies: 1
    • Views: 1,876
    07-07-2013, 04:34 AM Go to last post
  46. Poisson distribution problem

    Hello everybody, Im needing some help with the following problem: The number of defects every 100meters responds to a Poisson distribution with...

    Started by fededem‎, 07-04-2013 06:16 PM
    • Replies: 5
    • Views: 1,482
    07-05-2013, 12:38 PM Go to last post
  47. Game: multiple denominations, multiple repeating ident. cards of diff. qty's

    Problem description: Example: 51 cards, 15 different denominations, 7 have 5 identical cards each (total cards = 35), 8 have 2 identical cards...

    Started by jkstorm75‎, 07-04-2013 06:22 PM
    cards, complex, games, outcomes
    • Replies: 3
    • Views: 1,752
    07-05-2013, 12:22 PM Go to last post
  48. Post multiple dice rolls where each dice has a different number of sides.

    Hi all, :) I would appreciate any and all help given. Abstract of the problem: How can I calculate the probability of any given number turning up...

    Started by cathalpaint‎, 07-04-2013 08:07 AM
    clueless, dice, probability, sides
    • Replies: 1
    • Views: 3,355
    07-05-2013, 12:14 AM Go to last post
  49. Calculating number of individuals from probability

    Hello everyone, I am a little new to statistics - so sorry if this sounds very basic to most of you - but I have been scratching my head over this...

    Started by Neodyme‎, 07-03-2013 10:26 PM
    independent events, minimum maximum number, probability
    • Replies: 4
    • Views: 1,367
    07-04-2013, 09:00 PM Go to last post
  50. correct probability distribution

    stupid question i know, but when a question asks me to identify the correct method of PB what exactly do i have to do? thanks :)

    Started by worldofquery‎, 05-19-2013 02:42 AM
    • Replies: 3
    • Views: 1,967
    07-04-2013, 04:42 PM Go to last post
  51. Question Central Limit Theorem

    True or False. According to the Central Limit Theorem, the expected value for a sample mean approaches 0 as the sample size approaches infinity. I...

    Started by lchurchill‎, 07-01-2013 07:53 PM
    • Replies: 1
    • Views: 2,258
    07-01-2013, 07:55 PM Go to last post
  52. are mixture of Gaussian distributions still elliptical distributions?

    basically what the title of the thread says, lol. most of my google searches point towards a 'yes' (which is good) but i just wanted to run it...

    Started by spunky‎, 07-01-2013 03:39 AM
    • Replies: 10
    • Views: 2,310
    07-01-2013, 03:07 PM Go to last post
  53. Simple Combinatorics Question

    Hello, I have to solve the following problem: "There are N Books and p are indistinguishable. How many possibilities exists, to put them side by...

    Started by lunxcell‎, 06-30-2013 06:04 AM
    • Replies: 1
    • Views: 1,971
    06-30-2013, 08:06 AM Go to last post
  54. Smile Conditional expectation, normal distributions

    I'm having some trouble with the following problem: Problem: Let X and Y be independent N(0,1) random variables. Determine E(X|X>Y) My...

    Started by saubersbox‎, 06-27-2013 02:18 PM
    • Replies: 4
    • Views: 7,859
    06-27-2013, 05:38 PM Go to last post
  55. Factor Analysis PROOF

    This question pertains a small result in Factor Analysis, under what is called the Orthogonal Factor Analytic Model, where the decomposition of the...

    Started by spunky‎, 06-24-2013 05:25 PM
    • Replies: 2
    • Views: 2,868
    06-26-2013, 09:43 PM Go to last post
  56. need help understanding interview question

    Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

    Started by r4qx‎, 06-22-2013 06:38 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,538
    06-24-2013, 12:41 PM Go to last post
  57. bio stats probability basic problem

    : Biostatistics problem. Probability of obtaining positive test results in a diagnostic method. Hello: I have a biostatistics/probability...

    Started by parsec2011‎, 05-29-2013 06:03 AM
    diagnostic
    • Replies: 9
    • Views: 2,144
    06-23-2013, 09:31 AM Go to last post
  58. understanding confidence: help refresh my memory

    ive been searching on the internet but the web pages ive read havent been enough to jar my memory. i took statistics and probability in college but i...

    Started by oldstudent‎, 06-22-2013 01:27 PM
    • Replies: 2
    • Views: 1,509
    06-22-2013, 02:23 PM Go to last post
  59. Multiplication Theorem on Probability and proof

    Hi Everyone! I'm with Conditional Probability and I don't understan this theorem. Theorem: If then Proof:

    Started by alfred_oh‎, 06-15-2013 03:18 PM
    • Replies: 1
    • Views: 6,083
    06-22-2013, 11:22 AM Go to last post
  60. law of total probability origin?

    Hello - I was curious about the origin of The Law of Total Probability, specifically who slated this law and when? Wikipedia provides an overview of...

    Started by random512‎, 06-21-2013 07:06 PM
    • Replies: 0
    • Views: 886
    06-21-2013, 07:06 PM Go to last post

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