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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: 10,427
    09-30-2005, 09:44 AM Go to last post
  1. Joint distributions for Order Statistics

    I have a problem with part b of this question. I found the joint distribution and seem to have problem integrating it. I seem to have gotten a double...

    Started by bk123‎, 04-26-2013 12:45 PM
    • Replies: 7
    • Views: 510
    Yesterday, 10:33 PM Go to last post
  2. Probability growth with time

    Hey, I am not an expert at probability. I've been wondering about a simple question that seem really hard for me to find an answer to simply by...

    Started by elite5chris‎, Yesterday 03:56 PM
    • Replies: 0
    • Views: 58
    Yesterday, 03:56 PM Go to last post
  3. moments vs parameters

    Hi there, could you help me to understand the difference between moments and parameters of a distribution? I read definitions of moments like...

    Started by ilaria‎, Yesterday 04:48 AM
    • Replies: 2
    • Views: 87
    Yesterday, 11:30 AM Go to last post
  4. Probability that a normal random variable lies between 2 values

    Hi all, I have been looking at this problem for a little while now and can't get anywhere with it. All of my notes relate to a variable lying between...

    Started by hula‎, 04-15-2014 09:25 AM
    • Replies: 1
    • Views: 85
    04-15-2014, 09:49 AM Go to last post
  5. Continuous probabibility distribution.

    Please help me with this problem, I don't understand it pretty well. The management of bidding of a company understands that the low bid X in...

    Started by camilaberas‎, 04-15-2014 01:25 AM
    • Replies: 0
    • Views: 114
    04-15-2014, 01:25 AM Go to last post
  6. Conditional Probability?

    What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

    Started by mathprof‎, 04-12-2014 07:45 PM
    conditional probability, dice
    • Replies: 5
    • Views: 146
    04-12-2014, 11:20 PM Go to last post
  7. what is the most honest way to divide the prize?

    Two men play some game several times till 10 wins. From the beginning each of them puts 500$ for the final prize. At the score 7:4 they stopped...

    Started by eliranazulay‎, 04-12-2014 02:57 PM
    • Replies: 1
    • Views: 76
    04-12-2014, 04:05 PM Go to last post
  8. A bouncing ball is giving me fits.

    Hi. Thank-you for reading this. My name's Philip Ripper. I'm not a student. I'm a curious person with a fairly poor math education. This is...

    Started by Tethers‎, 04-11-2014 12:00 PM
    • Replies: 6
    • Views: 173
    04-11-2014, 08:53 PM Go to last post
  9. Seemingly unsolvable conditional probability

    The following is a question that is likely to be appear on my exam on Friday (tomorrow) but contextualised into a different scenario. I'm having...

    Started by scotty93‎, 04-10-2014 06:49 AM
    normal distribution, probability density, statistics
    • Replies: 2
    • Views: 143
    04-10-2014, 09:39 AM Go to last post
  10. A probability question

    Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2...

    Started by acevialli‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 164
    04-09-2014, 07:50 AM Go to last post
  11. Electrical Engineering Random Process

    The question is below. A Random Process is given by X(t) = St + A. for t>=0 and X(t) = 0 for t<0. S is a zero-mean Gaussian RV with standard...

    Started by Crusader256‎, 04-08-2014 04:17 PM
    • Replies: 4
    • Views: 181
    04-08-2014, 08:46 PM Go to last post
  12. Probability Questions. Electrical Engineering.

    I am having a difficult time with these questions. Can anyone help?

    Started by TEE262014‎, 04-08-2014 03:15 PM
    • Replies: 1
    • Views: 70
    04-08-2014, 03:49 PM Go to last post
  13. Extreme Value Theory with Gamma variables

    Hey guys, I'm a bit of a statistics weakling so I could use some help on a problem I'm trying to solve. Basically I got N random gamma variables...

    Started by MagnetsGT‎, 04-08-2014 02:27 PM
    • Replies: 0
    • Views: 95
    04-08-2014, 02:27 PM Go to last post
  14. Probability in normal distribution

    The weight of persons in a country is normally distributed with a mean equal to 70 kg and a standard deviation equal to 12 kg. a. What is the...

    Started by Tadele‎, 04-08-2014 07:36 AM
    • Replies: 1
    • Views: 71
    04-08-2014, 07:58 AM Go to last post
  15. Please help me to solve a problem on conditional probability

    Please help me to solve a problem on conditional probability: 91 from 144 fishes in the river are polluted, only 6 fishes from these 144 are...

    Started by Scrooge‎, 04-05-2014 01:56 PM
    • Replies: 3
    • Views: 135
    04-05-2014, 03:11 PM Go to last post
  16. Binomial distribution problem.

    I think this is a binomial distribution problem but I just don't know how to solve it. It gets a bit hard when I have to decide which is x, n or p ...

    Started by camilaberas‎, 03-31-2014 11:35 AM
    • Replies: 1
    • Views: 170
    03-31-2014, 11:54 AM Go to last post
  17. A question in order statistics of continuous type distribution

    Let X1,X2, be a sequence of random variables from a continuous type distribution and m and n be two integers such that m<n, and 2≤n−m. How can I...

    Started by hadiSanji‎, 03-30-2014 08:32 PM
    • Replies: 1
    • Views: 203
    03-30-2014, 11:02 PM Go to last post
  18. Mental block on concept of PDF for a duration

    I'm reading "A Tutorial on Hidden Markov Models and Selected Applications in Speech Recognition" and I am having a problem conceptually...

    Started by learnitapplyit‎, 03-26-2014 06:41 PM
    • Replies: 2
    • Views: 153
    03-26-2014, 08:25 PM Go to last post
  19. Limit in probability of (x-bar)^2 ?

    Anyone have any idea how to prove or show what the limit in probability of (x-bar)^2 is? sample is drawn from CDF F(x)=1-x^-4

    Started by haml.kn‎, 03-25-2014 08:43 PM
    convergence, probabilistic sampling, probability
    • Replies: 3
    • Views: 164
    03-26-2014, 07:31 PM Go to last post
  20. Continuous Local Martingale Question

    I have attempted the following local martingale question. I'm not sure if the proof is correct. If M is in the space of continuous local...

    Started by chrishello‎, 03-25-2014 05:53 PM
    • Replies: 2
    • Views: 117
    03-26-2014, 08:30 AM Go to last post
  21. How to determine distribution with no parameters

    I'm confused by this question and I was hoping for some guidance some one to point me in the right direction Let X1.........Xn be a random sample...

    Started by haml.kn‎, 03-24-2014 09:40 PM
    probability, probability distribution
    • Replies: 3
    • Views: 193
    03-25-2014, 08:45 PM Go to last post
  22. Binomial Distribution in Excel

    7. An emergency room administrator wants to know the proportion of emergency room patients who spend more than one hour waiting to be seen. He has...

    Started by xdayita‎, 03-22-2014 07:26 PM
    • Replies: 1
    • Views: 201
    03-24-2014, 03:04 PM Go to last post
  23. Similar numbers in a data set

    Hi guys, I am looking at a programming problem here, and would like to "deduce" a formula out of my problem. I have an array of n (known)...

    Started by alex01‎, 03-22-2014 10:34 AM
    probability question, similarities, statistics
    • Replies: 2
    • Views: 144
    03-22-2014, 02:22 PM Go to last post
  24. Probability and coincidences help

    Can someone please help in the breakdown of how I do this question I am completely lost and I am not sure how to even word the answers ...

    Started by clarence85‎, 03-22-2014 01:51 AM
    coincidences, probability help, probability homework help
    • Replies: 0
    • Views: 123
    03-22-2014, 01:51 AM Go to last post
  25. Question Forecasting with several models

    I would like to know how to deal with (presumed) independent models that provide different forecasted values. For example, let's assume that I...

    Started by Perrete‎, 03-19-2014 08:45 AM
    • Replies: 0
    • Views: 152
    03-19-2014, 08:45 AM Go to last post
  26. Smile Probability question making my brain hurt :p

    "suppose you know that a friend of yours has two children and that at least one of them is a boy. One day, you visit your friend's house and his son...

    Started by clairethackray‎, 03-17-2014 11:14 PM
    • Replies: 1
    • Views: 249
    03-18-2014, 03:22 AM Go to last post
  27. binomial random variable

    I'm having trouble understanding how I'm supposed to answer part a of this question I'm on. I was able to do b, c, d, and e though. Problem: The...

    Started by lindseyam‎, 03-17-2014 02:46 PM
    • Replies: 0
    • Views: 103
    03-17-2014, 02:46 PM Go to last post
  28. correlation matrix

    E = integral o to 2i of the exp( ) = 2*pi*exp(i*x1(-m)) likewise for the x2 *x2 case = 2*pi*exp(i*x2*(-m)) For the other two parts E = I am...

    Started by stephanie‎, 03-13-2014 10:24 PM
    • Replies: 1
    • Views: 158
    03-15-2014, 10:56 PM Go to last post
  29. Multivariate distributions that are 'closed' under marginalization?

    a very, very nice property of the multivariate normal distribution is that any lower-dimensional margins are also multivariate (or univariate,...

    Started by spunky‎, 03-14-2014 02:19 PM
    marginal probability, probability distributions
    • Replies: 4
    • Views: 243
    03-15-2014, 09:50 PM Go to last post
  30. variance of cosine functions

    What are stronger inequality bounds than the chebyshev for variance?

    Started by nikki101‎, 03-14-2014 03:58 PM
    • Replies: 0
    • Views: 177
    03-14-2014, 03:58 PM Go to last post
  31. Number of trials in zero-sum game

    Hi all, this is my first post here! Forgive me if it's not in the right place. I have a question that's been bugging me because I tend to be...

    Started by SR_87‎, 02-11-2014 04:46 AM
    • Replies: 5
    • Views: 247
    03-14-2014, 08:20 AM Go to last post
  32. First stats course. need help with this problem

    a tree stand has 12 douglas firs, 10 maples, 3 hemlocks, and 7 cedars. if you randomly select 6 trees, what is the probability that at least 2 of...

    Started by pearza‎, 03-10-2014 11:08 PM
    • Replies: 5
    • Views: 237
    03-11-2014, 02:10 PM Go to last post
  33. Need some help on this question. Thanks

    There are 12 balls in a bag that are numbered 1-12. I will choose one number (say I choose no. 5). Then four balls are picked at random. What is the...

    Started by Redoxified‎, 03-10-2014 07:55 AM
    • Replies: 3
    • Views: 208
    03-11-2014, 05:05 AM Go to last post
  34. Coin Flip and calling randomly

    If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

    Started by codenamenikky‎, 03-07-2014 04:06 PM
    basic probability, coin flips
    • Replies: 5
    • Views: 241
    03-10-2014, 08:47 AM Go to last post
  35. Z-values and probability

    Suppose concentration of arsenic (in ppb) in groundwater sampled quarterly from a particular well can be modeled with a normal distribution with a...

    Started by chickennugget‎, 03-09-2014 07:30 PM
    probability homework help
    • Replies: 0
    • Views: 201
    03-09-2014, 07:30 PM Go to last post
  36. Event Tree Probability Question

    Event Tree Probability Question. One has tried looking this one up and Googling it, One is also dispraxic so while math can be tricky if one can...

    Started by MattAdlard‎, 03-09-2014 02:34 PM
    event tree, proability, probability
    • Replies: 0
    • Views: 150
    03-09-2014, 02:34 PM Go to last post
  37. Continuity correction, poisson

    Hi There is something that puzzles me. I tried calculating a Poisson probability. Exactly, and with the normal distribution, using both the...

    Started by Tarly‎, 03-09-2014 10:08 AM
    • Replies: 3
    • Views: 182
    03-09-2014, 11:27 AM Go to last post
  38. Mmsee

    If I am given a random vector X with mean ' and a covariance matrix C= how do I find the MMSEE of x1 given x2 = 0 x3 = 0 x4 = 0

    Started by stephanie‎, 03-07-2014 05:32 PM
    math stats, variance
    • Replies: 4
    • Views: 219
    03-08-2014, 12:51 AM Go to last post
  39. Binomial formula - solve for N help ...

    Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula:...

    Started by brooksr‎, 03-07-2014 10:45 PM
    basic probability, binomial
    • Replies: 1
    • Views: 175
    03-08-2014, 12:42 AM Go to last post
  40. Post Poisson Distribution

    On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

    Started by luis0426‎, 03-05-2014 07:42 PM
    • Replies: 1
    • Views: 223
    03-06-2014, 09:50 PM Go to last post
  41. Homework Help! Axioms of Probability

    Hi, so I've been stuck on three problems after multiple submissions and still cannot get it right! Can someone help and mind explaining? The bolded...

    Started by _xoxochip_‎, 03-05-2014 07:05 PM
    • Replies: 0
    • Views: 157
    03-05-2014, 07:05 PM Go to last post
  42. Post Need help with this problem

    On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

    Started by luis0426‎, 03-05-2014 03:53 PM
    • Replies: 2
    • Views: 155
    03-05-2014, 06:24 PM Go to last post
  43. Apparent contradiction with the definition of probability

    Hi everyone, here is my doubt: according to the definition of probability the probability that in a coin tossing the result be heads is 0.5 because...

    Started by ivhenao‎, 03-05-2014 04:39 PM
    • Replies: 1
    • Views: 176
    03-05-2014, 04:58 PM Go to last post
  44. Question calculating expected cell frequency multivariate normal distribution

    How would I go about calculating the expected cell frequency of a discrete distribution (say, multivariate normal)? The 1-D analog would be the...

    Started by studentofstudent‎, 03-04-2014 07:52 PM
    • Replies: 3
    • Views: 229
    03-05-2014, 06:48 AM Go to last post
  45. Cool Care to place a bet? (probability guru needed)

    I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

    Started by meridian‎, 03-04-2014 12:24 PM
    • Replies: 1
    • Views: 158
    03-04-2014, 09:14 PM Go to last post
  46. Probablity

    The probability that in a fair a person will hit the balloon is 0.25. What is the probability that a person will hit 2 balloons using binomial...

    Started by siddharthvithlani‎, 03-03-2014 10:40 PM
    • Replies: 1
    • Views: 183
    03-03-2014, 10:42 PM Go to last post
  47. Multivariate normal distribution, not full rank, probability density function

    If X has a multivariate distribution of full rank and Y is the sum of the elements of X. Then (X,Y) is a multivariate normal distribution but not...

    Started by JJstar‎, 03-03-2014 10:08 AM
    density function, multivariate normal
    • Replies: 1
    • Views: 193
    03-03-2014, 11:06 AM Go to last post
  48. Probability question

    I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

    Started by ab1234‎, 03-02-2014 06:33 PM
    hypergeometric, urn
    • Replies: 5
    • Views: 202
    03-02-2014, 10:36 PM Go to last post
  49. Deriving the sampling (or asymptotic) distribution

    Assume we have the following function: f(p) = \frac{1}{(1-p)d}\ln\left(\frac{1}{T}\sum_{t=1}^{T}\left^{1-p} \right) where d is a constant ...

    Started by TrueTears‎, 02-19-2014 12:41 AM
    • Replies: 3
    • Views: 281
    03-02-2014, 12:18 AM Go to last post
  50. Events following Poisson Distribution including a fixed dead time

    Hi, Im trying to describe some events with the Poisson distribution and overall its a really good fit. There is however a slight error in the...

    Started by honestlyno‎, 03-01-2014 08:40 AM
    person-time, poisson
    • Replies: 1
    • Views: 194
    03-01-2014, 09:08 PM Go to last post
  51. Multiple Criteria, non-binary outcomes

    So, I'm trying to predict outcomes using baseball data. What I want to do is predict the outcome of batted balls based on the following criteria: ...

    Started by agutts6‎, 02-26-2014 11:51 AM
    baseball, conditional probability
    • Replies: 2
    • Views: 164
    02-28-2014, 10:47 AM Go to last post
  52. Poker Club Probability of Winning Question

    I need some help. I'm looking for how to calculate the odds\probability of a person winning in a poker club based on events that have already...

    Started by scalfdn‎, 02-20-2014 12:06 AM
    • Replies: 2
    • Views: 227
    02-27-2014, 10:34 PM Go to last post
  53. Probability of coincidence ?

    Probability of coincidence ? (WARNING... resolving this problem may force upon you world fame and extreme wealth) I basically don't know where to...

    Started by RobAbility‎, 02-19-2014 04:06 PM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 1,085
    02-27-2014, 08:21 PM Go to last post
  54. Probability question - Cards

    Hello everyone! I just started to study statistics by myself because I spent a semester abroad and there are no more lectures at the University, if...

    Started by katabate‎, 02-26-2014 04:17 AM
    cards problem, probability
    • Replies: 0
    • Views: 122
    02-26-2014, 04:17 AM Go to last post
  55. Same flat tire

    Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

    Started by dina786‎, 10-01-2012 06:08 PM
    • Replies: 7
    • Views: 1,143
    02-25-2014, 11:24 PM Go to last post
  56. Probability of selecting two different colored balls

    Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

    Started by Daddii‎, 02-23-2014 12:45 PM
    probability, replacement, selection
    • Replies: 12
    • Views: 309
    02-25-2014, 09:20 PM Go to last post
  57. probability & time series

    hi I'm a physician and really need help from somebody who is good at probability. I calculated time series of tidal stresses. It turned out that...

    Started by sthoriginal‎, 02-25-2014 10:44 AM
    • Replies: 1
    • Views: 171
    02-25-2014, 01:59 PM Go to last post
  58. Need help- formulating difference equation

    there is a square with 4 equal blocks. if a mosquito set to fly starting at block 1, it is equally likely to fly to other blocks 2,3,4. what is the...

    Started by saandy‎, 02-24-2014 07:00 PM
    • Replies: 0
    • Views: 113
    02-24-2014, 07:00 PM Go to last post
  59. Weiner Hopf method cross-correlation confusion

    u(n) = .4s(n) +.7s(n-1)-.1s(n-1) +v(n) where variance of v(n) = .003 I want to find the cross correlation matrix against the optimal delay of 6...

    Started by nikki101‎, 02-23-2014 11:07 PM
    • Replies: 0
    • Views: 152
    02-23-2014, 11:07 PM Go to last post
  60. New at this

    If I offer a 90% satisfaction rate. and 3 people call me what is the probabilty that they will satisfied?

    Started by kkdd‎, 02-23-2014 07:25 PM
    • Replies: 1
    • Views: 143
    02-23-2014, 07:56 PM Go to last post

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