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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: 30,373
    09-30-2005, 09:44 AM Go to last post
  1. Probability on 2 random events combined

    event A and B are not related but : if A happens then the event C has a probability W of happening. if B happens then the event C has a probability...

    Started by noobstats‎, 05-18-2012 02:45 PM
    combination, events, random
    • Replies: 2
    • Views: 2,138
    05-19-2012, 05:12 AM Go to last post
  2. expectation and integral

    Hi maybe a stupid question: Let X be a random variable depending on a parameter \xi . Further let f : \mathbb{R} \rightarrow \mathbb{R} be a...

    Started by statsdonkey‎, 05-18-2012 08:35 AM
    • Replies: 4
    • Views: 2,312
    05-18-2012, 02:05 PM Go to last post
  3. Branching process question

    Hi I have attached my question, I needed help on part ii). I don't know how compute P(N=n) Thanks

    Started by cjones‎, 05-17-2012 09:34 AM
    • Replies: 1
    • Views: 2,025
    05-18-2012, 12:52 AM Go to last post
  4. probability of dying first

    Hi I thought about this question when i was at this concert the other day. There were a lot of old people in the concert....people in their 80's.......

    Started by mike316‎, 05-17-2012 05:11 PM
    • Replies: 1
    • Views: 1,607
    05-17-2012, 07:15 PM Go to last post
  5. modelling departure time probability on consecutive days with copula function

    Hello, I have data of the departure and arrival time of cars from their home. These stochastic variables are modelled using a normal copula...

    Started by bradyj2‎, 05-17-2012 11:46 AM
    • Replies: 0
    • Views: 1,546
    05-17-2012, 11:46 AM Go to last post
  6. Finding Probability Density Function

    Hi guys, I need help with the attached question. Appreciate your quick response.

    Started by pnasr‎, 05-14-2012 09:56 PM
    • Replies: 3
    • Views: 2,250
    05-15-2012, 04:38 PM Go to last post
  7. Backwards probability: estimate an original content from a sample

    Hello, Here is my problem. In a container are between 10power5 to 10power9 unique elements, each of them could be present several times...

    Started by mousme‎, 05-15-2012 11:25 AM
    • Replies: 0
    • Views: 1,586
    05-15-2012, 11:25 AM Go to last post
  8. Need help with E(Z) and limit theorems

    1) Let Xk be a sequence of independent random variables uniformly distributed on . Let Yk = max(X2k-1,X2k). Let Zn = (Y1+...+Yn)/n. Calculate...

    Started by saternal‎, 05-14-2012 02:14 AM
    • Replies: 2
    • Views: 1,687
    05-14-2012, 04:55 AM Go to last post
  9. Question Please Help on Joint Probability Question

    Hi, I'm having trouble with a homework problem and I was wondering if someone could walk me through it a bit. Alex and Yan agree to meet at the...

    Started by avalanche72‎, 05-13-2012 10:57 PM
    • Replies: 1
    • Views: 1,405
    05-14-2012, 12:19 AM Go to last post
  10. set question from Goldberg's book

    I am working my way through Goldberg's Probability: An Introduction and am stuck on problem 4.13, chapter 2. The problem states: "Let E and F be any...

    Started by ptremblay‎, 05-13-2012 05:22 PM
    • Replies: 2
    • Views: 1,701
    05-13-2012, 08:50 PM Go to last post
  11. Subtract two Log normal R.Vs

    Hello every one, here is the problem. We have two Gaussian R.V's : z1 and z2 such that z1~N(mu1,sig1) and z2~N(mu2,sig2). Now if have two other...

    Started by sensor101‎, 05-10-2012 05:59 PM
    • Replies: 4
    • Views: 2,824
    05-13-2012, 09:11 AM Go to last post
  12. Question Please Help :(

    I been trying to figure this out for so long, i just dont get it. if anyone can explain the answer it'd be very much appreciated. A box of 100...

    Started by statshead‎, 05-11-2012 08:26 AM
    • Replies: 8
    • Views: 2,216
    05-12-2012, 01:37 AM Go to last post
  13. Question A question in probability

    i wanna know the difference between P(A∩B) and P(A|B) i don't mean in the law i mean its meaning what i know is P(A∩B) ==> is the probability of A...

    Started by wwonderboy‎, 05-11-2012 08:55 AM
    • Replies: 1
    • Views: 1,624
    05-11-2012, 11:39 AM Go to last post
  14. Expectation doesn't exist!

    A game is played as follows: A pile contains x dollars and a coin is flipped. Each time a heads occurs, the amount in the piled is doubled and if a...

    Started by rogersticks‎, 05-10-2012 07:16 PM
    • Replies: 1
    • Views: 2,524
    05-11-2012, 01:17 AM Go to last post
  15. Binomial Distribution, 150 tosses of fair coin, P(40%<= X <=50%)

    Hi, im getting the wrong answer for the following question and not sure why. (Question) A fair coin is tossed 150 times. Find the probability that...

    Started by Hans Rudel‎, 05-10-2012 05:27 AM
    binomial distribution
    • Replies: 2
    • Views: 2,550
    05-10-2012, 07:17 AM Go to last post
  16. Probability question

    I need some help to prove this. https://docs.google.com/drawings/d/1M34iGB7u4C_kK3f-vcGTgDSuasIkRNORGmAWZ-bB5wk/edit?pli=1 Please, help me.

    Started by nathcat‎, 05-09-2012 09:20 PM
    probability
    • Replies: 1
    • Views: 1,677
    05-09-2012, 09:37 PM Go to last post
  17. P-value Question

    Hi! I have a question involving P-Values in a specific context. Suppose you have an 1-Way ANOVA with k groups. If you obtain a significant p-value...

    Started by jamesmartinn‎, 05-08-2012 01:28 PM
    • Replies: 2
    • Views: 3,492
    05-09-2012, 02:05 PM Go to last post
  18. Expected value

    Could someone please explain the following? A guy and a girl play a game where they roll a dice. If the guy rolls an even number, the girl pays...

    Started by Hans Rudel‎, 05-05-2012 12:53 PM
    expected value
    • Replies: 2
    • Views: 1,685
    05-09-2012, 01:21 PM Go to last post
  19. Moment Generating Function of a Chi-Squared distribution

    Hey guys, need help with this question. Random Variables V and U are independent with N~(0,4). Let W = U^2 + V^2 . Calculate P(W>24). Is the...

    Started by saternal‎, 05-07-2012 09:02 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 7,604
    05-09-2012, 01:54 AM Go to last post
  20. Question on probability

    Hello, I have a sample of 593 whole numbers. The mean of the sample is 183.1197. The standard deviation is 32.0713 My question is what is...

    Started by tooolf4this‎, 05-08-2012 11:12 PM
    • Replies: 0
    • Views: 1,310
    05-08-2012, 11:12 PM Go to last post
  21. Almost lost 10$ at the bar

    First off, I am kind of drunk, so excuse the simple mistakes. I was just given even odds on a bet on 1 roll of 5 dice. (I didn't take it) Meaning we...

    Started by nofmxc‎, 05-08-2012 03:13 AM
    bar, beer, bet, dice, gamble
    • Replies: 0
    • Views: 1,202
    05-08-2012, 03:13 AM Go to last post
  22. Help with strategy for a simple game for a book I am writing:

    Hope this is the right forum to put this in....This is a strategy I am trying to fine tune for a book I am writing about the card game Pinochle. ...

    Started by rakbeater‎, 05-07-2012 09:34 PM
    • Replies: 2
    • Views: 1,455
    05-07-2012, 10:03 PM Go to last post
  23. Mutual independence -> Conditional independence ?

    hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

    Started by -coffee-‎, 05-07-2012 07:39 AM
    • Replies: 1
    • Views: 2,448
    05-07-2012, 09:31 AM Go to last post
  24. MLE Problem

    Im preparing for my final exam plz give me some help or hints in this problem i have no idea on solving this :( p.s. the question is attached...

    Started by TYW‎, 05-01-2012 01:58 AM
    • Replies: 3
    • Views: 2,005
    05-06-2012, 07:09 AM Go to last post
  25. Probability question

    Okay so heres the information given and the question. Information: 1) 60% of U.S. women 18 yrs and older believe driving age should be 18 2)...

    Started by JayJay65‎, 05-05-2012 02:15 PM
    • Replies: 3
    • Views: 2,679
    05-05-2012, 03:22 PM Go to last post
  26. Poisson or Binomial

    Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

    Started by Hans Rudel‎, 05-01-2012 07:44 AM
    binomial distribution, poisson distribution
    • Replies: 5
    • Views: 9,506
    05-03-2012, 08:19 AM Go to last post
  27. Card Pairs Problem with a Twist (TV Gameshow)

    Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

    Started by Brian Factor‎, 05-03-2012 04:50 AM
    • Replies: 0
    • Views: 1,532
    05-03-2012, 04:50 AM Go to last post
  28. Target Mrgn of Vic with % of votes remaining in election: Is this a Hypergeom. Dist.?

    Thank you a million for any help you might be able to provide. I've been plugging away at this on and off for a couple weeks now. I'm not well-versed...

    Started by Quadrapolis‎, 05-02-2012 11:51 PM
    • Replies: 0
    • Views: 1,526
    05-02-2012, 11:51 PM Go to last post
  29. Hopefully Simple Question

    I've been out of school too long to remember how to do this but, my friend, a principal had brought up an interesting convo about some of his...

    Started by kmind‎, 05-01-2012 02:10 PM
    • Replies: 11
    • Views: 3,749
    05-02-2012, 03:11 PM Go to last post
  30. Bivariate Normal Distribution

    I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

    Started by mahu‎, 05-02-2012 02:51 AM
    bivariate normal
    • Replies: 1
    • Views: 5,121
    05-02-2012, 03:12 AM Go to last post
  31. Pdf

    Please solve this problem If the reandom variable x has the pdf f(x) = 3x (0<x<1) f(x) = 0 (elsewhere) then find the pdf of y = 4x +3

    Started by ranadastidar‎, 05-02-2012 01:25 AM
    • Replies: 1
    • Views: 1,194
    05-02-2012, 01:44 AM Go to last post
  32. Probability

    Dear expert's kindly solve this problem A normal population has mean 0.1 and sd 2.1. Find the probability that the mean of a sample of size 900...

    Started by ranadastidar‎, 05-02-2012 01:23 AM
    probability
    • Replies: 0
    • Views: 1,698
    05-02-2012, 01:23 AM Go to last post
  33. Which sampling type to use?

    What kind of sampling do researchers use to estimate population parameters on individual data? a. population sampling b.nonprobability sampling...

    Started by zwardla‎, 05-01-2012 08:22 PM
    • Replies: 1
    • Views: 1,690
    05-01-2012, 09:36 PM Go to last post
  34. Thumbs down No clue when to use nCr or multiply the probabilites..

    I'm completely baffled as to when to use nCr or multiply the probabilites.. Here's an example.. Jane buys 5 jam donuts, 4 cream donuts and 3...

    Started by Gemmaaahhhh‎, 05-01-2012 01:48 PM
    help me!, ncr, probablity
    • Replies: 1
    • Views: 5,228
    05-01-2012, 02:41 PM Go to last post
  35. Multivariate probability density and distance... help!!

    Hi all. I'm far from a stats connoisseur, and will probably use all the wrong words and describe my problem poorly. But I've got to figure it out...

    Started by bassganglia‎, 05-01-2012 11:58 AM
    distance, multivariate, probability density
    • Replies: 0
    • Views: 1,796
    05-01-2012, 11:58 AM Go to last post
  36. Final Exam Study Problem: Find P(Y<X-1) - Should I just use a double integral?

    A shaded region with boundries y=x^2 ; y=0 ; x=2 The j.d.f. is... Fxy(x,y)= 1/(2x^2) ; 0<x<2 ; 0<y<x^2 Fxy(x,y) = 0 elsewhere Find...

    Started by SigEp‎, 04-30-2012 02:49 PM
    • Replies: 3
    • Views: 1,554
    04-30-2012, 08:19 PM Go to last post
  37. Poisson distribution, no call on 3 days out of 5 between 10.00am and 10.10am

    Hi, im having some issues with the following question. Question) A sales manager receives 6 phone calls on average between 9.30am and 10.30am on a...

    Started by Hans Rudel‎, 04-30-2012 09:06 AM
    poisson distribution
    • Replies: 2
    • Views: 2,860
    04-30-2012, 12:45 PM Go to last post
  38. probability question

    The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

    Started by bartowski‎, 04-28-2012 07:52 AM
    poisson, probability
    • Replies: 2
    • Views: 3,017
    04-29-2012, 03:03 PM Go to last post
  39. Probability distributions?

    Hi, I have this problem: Let Y be the number of fires a year and let X be the number of people who die in such fires each year. What are the...

    Started by kaidan‎, 04-28-2012 06:00 AM
    • Replies: 4
    • Views: 1,496
    04-29-2012, 04:51 AM Go to last post
  40. probability question

    The probability that an individual recovers from an illness in a one-week time period without treatment is 0.1. Suppose that 20 independent...

    Started by bartowski‎, 04-28-2012 09:39 AM
    • Replies: 1
    • Views: 4,211
    04-28-2012, 09:55 AM Go to last post
  41. poisson problem

    The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

    Started by bartowski‎, 04-28-2012 07:54 AM
    poisson, probability
    • Replies: 1
    • Views: 2,234
    04-28-2012, 09:36 AM Go to last post
  42. I need a Probability approach

    Hi, Can you help with the query below? The agents are in charge of assigning a root cause to specific queries by selecting the correct entry in...

    Started by olympiac‎, 04-28-2012 06:28 AM
    • Replies: 0
    • Views: 2,202
    04-28-2012, 06:28 AM Go to last post
  43. ball drop in a maze

    A ball bearing is dropped at the top of the maze (see diagram). It has a 50% chance of going left or right at each junction. Find the probability...

    Started by Hans Rudel‎, 04-24-2012 01:13 PM
    • Replies: 7
    • Views: 4,057
    04-27-2012, 02:33 PM Go to last post
  44. Where is my mistake? Markov Chain

    this thread can be deleted. thx

    Started by knild‎, 04-27-2012 10:27 AM
    • Replies: 0
    • Views: 1,174
    04-27-2012, 10:27 AM Go to last post
  45. A question about sampling

    Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

    Started by BigBugBuzzz‎, 11-11-2011 10:51 PM
    sampling, variance
    • Replies: 13
    • Views: 3,746
    04-27-2012, 09:52 AM Go to last post
  46. Expectation and variance of a count distribution

    Hi, I'm wondering how to get the expectation and the variance for a dataset which consists of counts of pixels for certain intensity classes (many...

    Started by Koen27‎, 04-26-2012 06:25 AM
    • Replies: 2
    • Views: 2,625
    04-27-2012, 12:05 AM Go to last post
  47. Is it possible to explain this concept to me in simple English?

    "Probability density function", particularly in how a histogram may provide an estimate of it. Roughly (very roughly) speaking, what's the...

    Started by TheMonk‎, 04-24-2012 05:04 PM
    • Replies: 2
    • Views: 1,647
    04-26-2012, 05:26 PM Go to last post
  48. Probability problem help

    I'm needing a little help finding the probability of a problem, I think I did this right but would just like to confirm. The problem is about mean...

    Started by jjhall5150‎, 04-26-2012 01:39 PM
    • Replies: 6
    • Views: 3,286
    04-26-2012, 04:03 PM Go to last post
  49. Question Parametrising LogNormal distribution knowing only sample mean, and 90th percentile

    I'm a little stuck, and hope someone will be able to explain this to me. I have sample mean, and value of the 90th percentile of the sample. If...

    Started by thatdannyt‎, 04-26-2012 02:53 AM
    distribution, lognormal, parameter estimation, parameterization, sigma^2
    • Replies: 1
    • Views: 3,299
    04-26-2012, 12:11 PM Go to last post
  50. E(X), bag with 6 red and 5 black balls, X = number of red balls

    A bag contains 5 black and 6 red balls. Two counters are drawn, one at a time, and not replaced. Let X be "the number of red counters drawn". Find...

    Started by Hans Rudel‎, 04-25-2012 11:25 AM
    e(x), pdf
    • Replies: 6
    • Views: 4,044
    04-25-2012, 12:52 PM Go to last post
  51. X and Y is independent. I didn't say that X and Y is conditional independent given Z.

    X and Y is independent. (Note that I didn't say that X and Y is conditional independent given Z.) Still pr(X|Z) * pr(Y|Z) = pr(XY|Z) is always...

    Started by kdc09072‎, 04-24-2012 08:50 PM
    • Replies: 1
    • Views: 2,350
    04-25-2012, 02:34 AM Go to last post
  52. E(X) , Cov(aX,bY)

    Let X and Y be random variables with the density f(x) such that f(X)=1 for 0<x<1 and f(x)=0 for x<0 and x>1. We have that Var(x) = Var(Y). 1)...

    Started by saternal‎, 04-23-2012 10:14 AM
    • Replies: 12
    • Views: 14,321
    04-24-2012, 08:52 PM Go to last post
  53. Propability question

    Hi all I have one mb stupid question but I dont know the answer. If we have chance of 20% to get something what is the whole chance to get this...

    Started by theimmortalbg‎, 04-24-2012 04:33 PM
    • Replies: 1
    • Views: 1,698
    04-24-2012, 04:49 PM Go to last post
  54. 2 four sided dice, probability of 1 dice = 3, sum = even

    2 four tetrahedral dice with sides, 1,2,3,4. the two dice are thrown, what is the probability that given the first dice is a 3, the sum of the 2...

    Started by Hans Rudel‎, 04-24-2012 04:19 AM
    2 dice, conditional probability
    • Replies: 1
    • Views: 11,395
    04-24-2012, 08:56 AM Go to last post
  55. summing two probability density functions---Gompertz hazard model?

    Hi, r-help members. I have a question about summing two density distributions. I have two samples from which I've estimated hazard parameters for...

    Started by @nthRo‎, 04-23-2012 04:44 PM
    density function, gompertz, hazard model, probability function
    • Replies: 0
    • Views: 3,221
    04-23-2012, 04:44 PM Go to last post
  56. independent vs mutually exclusive (confusion)

    I apologize in advance for asking such a stupid question but im having some serious issues getting my head around this concept. At present im using...

    Started by Hans Rudel‎, 04-23-2012 01:08 PM
    • Replies: 3
    • Views: 1,941
    04-23-2012, 02:25 PM Go to last post
  57. Only one of two events occurs

    P(A) = 8/15 P(B) = 1/3 P(A|B) = 1/5 (Question) calculate the probability that only one event occurs. i have already calculated that the...

    Started by Hans Rudel‎, 04-23-2012 11:10 AM
    exclusive events, probability
    • Replies: 3
    • Views: 6,134
    04-23-2012, 11:48 AM Go to last post
  58. Question Expected value! E(Y|min(Y,t))

    Any hints would be appreciated :). Suppose that d.f. of Y is F(y)=1 - e^{-y}, y>0. Take t>0. Find E(Y|min(Y,t)) and E(Y|max(Y,t)) Note:...

    Started by Kol‎, 04-22-2012 09:06 PM
    • Replies: 2
    • Views: 2,131
    04-23-2012, 11:26 AM Go to last post
  59. Fishing Probability

    The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability...

    Started by mbusa‎, 04-22-2012 03:44 PM
    • Replies: 1
    • Views: 6,448
    04-22-2012, 04:17 PM Go to last post
  60. Exponential likelihood ratio test help

    Hello all, I am trying to get a grasp of likelihood ratio tests. Can any one help me with the following problem? Exponential likelihood ratio...

    Started by acasas44‎, 04-22-2012 02:38 PM
    • Replies: 1
    • Views: 2,814
    04-22-2012, 03:12 PM Go to last post

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