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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: 30,309
    09-30-2005, 09:44 AM Go to last post
  1. Lightbulb Random Walk in 2D

    Please check the image. I need the asked probabilities. I know it is easy for u but my knowledge about probability is not good :) Thank you

    Started by cestar‎, 05-15-2011 10:08 AM
    • Replies: 2
    • Views: 2,010
    05-16-2011, 03:52 AM Go to last post
  2. Question Conditional covariance

    X_i\sim Ber(\frac{1}{4}) and Y_i\sim Ber(\frac{3}{4}). Find Cov(\sum_{i=1}^{N} X_i,\sum_{i=1}^{N} Y_i) where P(N=k)=\frac{1}{2^k} for k=1,2,3,.... ...

    Started by Sambit‎, 05-13-2011 09:45 AM
    • Replies: 5
    • Views: 8,193
    05-15-2011, 10:09 AM Go to last post
  3. Card guessing problem

    I took statistics & probability in college, but, for some reason, I seem to have a mental block on how certain things work. I never know which...

    Started by eleasmom‎, 05-09-2011 02:18 AM
    • Replies: 4
    • Views: 3,502
    05-15-2011, 04:26 AM Go to last post
  4. Lightbulb How can estimated mean of a variable be obtained by combining mean values of...?

    Hi everyone, I am new to the forum. This is my question: Let say that I have following random variables: X: number of boxes (discrete...

    Started by minhpdhn‎, 05-14-2011 10:16 AM
    • Replies: 2
    • Views: 3,715
    05-14-2011, 10:13 PM Go to last post
  5. Question finding MLE

    f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

    Started by Sambit‎, 05-11-2011 12:15 PM
    • Replies: 8
    • Views: 4,379
    05-13-2011, 08:05 AM Go to last post
  6. Probability: Sums and Products of Random Variables

    Suppose that X is uniformly distributed on (0,2), Y is uniformly distributed on (0,3), and X and Y are independent. Determine the distribution...

    Started by dizzle1518‎, 05-11-2011 05:44 PM
    • Replies: 1
    • Views: 5,770
    05-11-2011, 09:53 PM Go to last post
  7. Marginal distribution over components of a normal-Wishart distribution

    Hey, I have a Gaussian-Wishart distribution (with hyperparameters {m, B, W, v}) over the mean and precision matrix of a bivariate Gaussian...

    Started by hythlodaeus‎, 02-22-2011 01:22 PM
    • Replies: 2
    • Views: 9,457
    05-11-2011, 01:35 PM Go to last post
  8. linear combination of exponential distributions

    I have an equation with linear combination of exponential distributions, i.e. sum (c_i * exp(a_i)) on the right hand side, and on the left hand...

    Started by sarai‎, 04-19-2011 09:46 AM
    estimation, exponential distribution, function estimation, poisson
    • Replies: 2
    • Views: 8,245
    05-10-2011, 06:09 PM Go to last post
  9. A box contains 5 tickets

    A box contains fives tickets, each with a letter on it: Box : S T A R T Once a day, for n days, a ticket will be drawn at random, with...

    Started by amazedmango‎, 05-08-2011 07:08 PM
    • Replies: 1
    • Views: 2,981
    05-10-2011, 04:35 AM Go to last post
  10. Expected Value of (1/N)

    Someone rolls a pair of dice repeatedly until the first time a sum of eleven shows. Let N be the number of rolls required. Find E(1/N). So N is a...

    Started by amazedmango‎, 05-08-2011 06:17 PM
    • Replies: 2
    • Views: 5,512
    05-10-2011, 04:26 AM Go to last post
  11. Confidence interval?

    I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

    Started by mfurlend‎, 04-10-2011 11:44 PM
    • Replies: 3
    • Views: 3,919
    05-09-2011, 08:49 PM Go to last post
  12. Probability Help Please!

    A coin is tossed n times, where n is an odd number. Let X be the number of times heads show up in the n tosses. Define Y in terms of X as follows: if...

    Started by amazedmango‎, 05-07-2011 05:05 AM
    • Replies: 5
    • Views: 2,692
    05-09-2011, 11:55 AM Go to last post
  13. Probability and Statistics

    I am currently having trouble with one of my probability and statistics assignment questions and I'm hoping someone can help me. I can't seem to get...

    Started by StatsTrouble‎, 05-08-2011 11:30 PM
    • Replies: 1
    • Views: 2,367
    05-08-2011, 11:52 PM Go to last post
  14. Discrete random variable joint distribution

    Hi, I have a pretty basic question about problems involving discrete random variable joint distribution. I'm give an joint distribution table with...

    Started by tremor05‎, 05-07-2011 07:37 PM
    • Replies: 3
    • Views: 3,801
    05-08-2011, 11:52 AM Go to last post
  15. Probabilty question with two normal distributed variables

    Hi there! I need some hints on this question: Assume , the actual voltages of a sample of 6-volt batteries, are independent randomly...

    Started by Xianwen Chen‎, 05-08-2011 11:23 AM
    • Replies: 2
    • Views: 1,793
    05-08-2011, 11:43 AM Go to last post
  16. Comparing probability distributions over discrete random variables

    Hi guys Sorry if the post is not in the right place but I am new here. I am comparing the performance of two monte carlo methods. The results I...

    Started by altober‎, 05-08-2011 07:38 AM
    compare, discrete random variables, kl divergence, monte carlo, probability distributions
    • Replies: 0
    • Views: 2,992
    05-08-2011, 07:38 AM Go to last post
  17. Problem about probability: how can I fix it?

    Hello everyone! I should resolve this problem and I wonder if someone could help me understand everything that I consider to be able to solve it...

    Started by sand903‎, 05-07-2011 04:33 AM
    • Replies: 1
    • Views: 1,910
    05-07-2011, 11:09 AM Go to last post
  18. reliabilty calculation using poission distribution..urgent help plz

    Hi, can someone please help me out with the follwoing problem i've been really struggling with it. I would greatly appreciate if you can. The...

    Started by modscod‎, 05-06-2011 08:47 AM
    • Replies: 3
    • Views: 3,144
    05-07-2011, 09:07 AM Go to last post
  19. Failure computation weibull distribution

    The question is the following: A given log10(life) distribution has the following Weibull parameters: Shape parameter (beta) = 4.265 Scale...

    Started by yahoo1‎, 05-06-2011 08:21 AM
    • Replies: 2
    • Views: 2,038
    05-07-2011, 01:55 AM Go to last post
  20. Need some help thinking ...

    As funny as that sounds, it's actually been a while since my stat classes. This actually isn't a homework question, I'm just trying to analyse some...

    Started by csteph9‎, 05-06-2011 01:53 PM
    • Replies: 0
    • Views: 1,369
    05-06-2011, 01:53 PM Go to last post
  21. Probability - transformation of random variable

    In an analog to digital conversion an analog waveform is sampled, quantized and coded. A quantized function is a function that assigns to each sample...

    Started by dizzle1518‎, 05-04-2011 06:49 PM
    • Replies: 7
    • Views: 4,128
    05-05-2011, 11:02 AM Go to last post
  22. Monty Hall parameters

    Nevermind, figured it out.

    Started by molly846‎, 05-04-2011 08:36 PM
    • Replies: 1
    • Views: 1,814
    05-04-2011, 08:42 PM Go to last post
  23. Sampling distribution of standard deviation

    Hi, I need some help, please. If X_i~N(mu, s^2), what is the distribution of sample standard deviation , I mean, with n-1 degree of freedom? ...

    Started by wipeout‎, 05-04-2011 10:11 AM
    • Replies: 3
    • Views: 5,710
    05-04-2011, 02:58 PM Go to last post
  24. Epidemic processes please have a look

    Hello everyone I just would like anyone has knowledge about this topic to help me I have got the answer however , I do not understand it it...

    Started by Fisher‎, 05-04-2011 09:23 AM
    • Replies: 0
    • Views: 1,895
    05-04-2011, 09:23 AM Go to last post
  25. Basic Probability Problem...

    A container has 20 green & 30 red balls. Five balls are randomly drawn with replacement. Let x be the number of green balls drawn. Find the...

    Started by balletgirl‎, 05-02-2011 05:01 PM
    • Replies: 2
    • Views: 2,004
    05-03-2011, 07:05 AM Go to last post
  26. Solving probability questions (proofs)

    Hi all, I'm sometimes not sure whether I should answer a true/false probability question by using the axioms/formulae, or if I should give a...

    Started by windshear‎, 05-01-2011 10:35 AM
    • Replies: 1
    • Views: 5,030
    05-02-2011, 11:28 AM Go to last post
  27. Question Probability Marbles!!

    There are 5 red marbles and 195 blue marbles. Marbles are drawn randomly with replacement. What is the smallest number of draws, (d) for which...

    Started by ari142‎, 04-28-2011 05:18 PM
    • Replies: 4
    • Views: 2,782
    04-29-2011, 03:17 PM Go to last post
  28. Homework Help - Balls in Urn problem (hypergeometric distribution?)

    Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn...

    Started by dizzle1518‎, 04-26-2011 03:07 PM
    • Replies: 5
    • Views: 4,652
    04-29-2011, 10:18 AM Go to last post
  29. Poisson and Geometric Random Variable questions

    Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

    Started by dizzle1518‎, 04-26-2011 08:11 PM
    • Replies: 6
    • Views: 5,408
    04-28-2011, 10:29 PM Go to last post
  30. building a mailing response model

    was hoping someone had any ideas on building a model on the following. let's say we have monthly mailings plus a holdout cell over a period of 12...

    Started by simmas‎, 04-26-2011 12:17 PM
    • Replies: 0
    • Views: 1,673
    04-26-2011, 12:17 PM Go to last post
  31. "Bridging" uniform and "mass" distributions

    My goal is to find a family X(a, b) of random variables (continuously) depending on two non-negative parameters a and b . The family should have the...

    Started by 1stone‎, 04-26-2011 10:18 AM
    • Replies: 2
    • Views: 2,168
    04-26-2011, 11:22 AM Go to last post
  32. homework HELP! STUCK!

    I have no idea where to even begin. I've missed a lot of class, and have an exam. This is the sample problem. Any help would be great!

    Started by StylinOnU‎, 04-25-2011 09:04 PM
    • Replies: 0
    • Views: 2,278
    04-25-2011, 09:04 PM Go to last post
  33. continuous random variables two variables help.

    I need to know how to find two values that add up to 90% using only the standard deviation and the mean. please dont tell me something like ...

    Started by shazakala‎, 04-24-2011 04:50 AM
    • Replies: 1
    • Views: 1,893
    04-25-2011, 12:46 AM Go to last post
  34. continuous random variables help

    continuous random variables: basically, if you guys can answer this question for me and explain how its done I should be able to do the rest of...

    Started by shazakala‎, 04-23-2011 08:42 PM
    proportions, random variables
    • Replies: 1
    • Views: 2,210
    04-24-2011, 04:47 AM Go to last post
  35. Homicide Help!

    I'm building a program that is supposed to aid in homicide investigations by giving a possible profile of a killer, but I'm having trouble with the...

    Started by westShaft‎, 04-23-2011 05:19 PM
    help!, probability question
    • Replies: 0
    • Views: 2,671
    04-23-2011, 05:19 PM Go to last post
  36. Probability problem (independence)

    Hi all, I am struggling with this exercise. We have three events A, B, C. A is independent of B, and C is a subset of A. I want to check if also...

    Started by windshear‎, 04-23-2011 01:15 PM
    • Replies: 1
    • Views: 1,751
    04-23-2011, 01:39 PM Go to last post
  37. Finding posterior probability from natural frequencies

    I've repeatedly been trying to solve a problem (exercise 4.5) in John Kruschke's Doing Bayesian Analysis and I just can't work out how to get the...

    Started by Ian_Fin‎, 04-22-2011 01:12 PM
    • Replies: 2
    • Views: 2,399
    04-23-2011, 12:48 PM Go to last post
  38. Question Show that Expectation does not exist ?

    I've been stuck on this question for a few hours and would appreciate any help. Q. X is a random variable with mass function Px(x) =...

    Started by jenny1111‎, 04-20-2011 06:40 PM
    • Replies: 2
    • Views: 8,522
    04-20-2011, 11:38 PM Go to last post
  39. Question Joint Probabilities for Dependent Mixed Plans

    Hi Folks, Table T13.8 Joint Probabilities for Mixed Plans p612 Acceptance Sampling in Quality Control (2e) Seems to contain erroneous...

    Started by maxjasper‎, 04-20-2011 01:12 PM
    joint probabilities
    • Replies: 0
    • Views: 1,541
    04-20-2011, 01:12 PM Go to last post
  40. Normal Random Variables, Central limit theorem

    It is desired to estimate the mean compresive strength of a particular formulation of concrete. Samples are taken and their compressive strength...

    Started by cbutt78‎, 04-18-2011 02:10 PM
    • Replies: 1
    • Views: 1,880
    04-19-2011, 10:18 AM Go to last post
  41. Erf & Solving for x in the Normal Distribution cdf

    The cdf formula for Normal Distribution is: f(x) = 1/2 If mu = 0 and sigma = 200 x square root of 2 then f(x) = 1/2 Since f(x) is a...

    Started by StevenCraigMiller‎, 04-17-2011 10:04 AM
    • Replies: 3
    • Views: 7,110
    04-18-2011, 07:07 AM Go to last post
  42. cross corealtion matrix

    Hi can any body help that how can we calculate a cross correlation matrix coeff in real time uzmeed

    Started by uzmeed‎, 04-18-2011 05:45 AM
    • Replies: 0
    • Views: 2,333
    04-18-2011, 05:45 AM Go to last post
  43. Random number generation - Use Bernoulli for tennis match series?

    Q. The probability of A winning a game of tennis against B is 0.74 Simulate a best of 5 sets (first to win 3) between A and B. Use the following...

    Started by languagelearner23‎, 04-15-2011 05:57 PM
    • Replies: 3
    • Views: 4,514
    04-18-2011, 03:34 AM Go to last post
  44. Modified rejection method for random number simulation

    Q. The pdf of X is: f_X (x) = c(x^0.5)(1+x)^2.4 , 0≤x≤1 where c is an appropriate constant. Set up a procedure for generating a random...

    Started by languagelearner23‎, 04-15-2011 06:30 PM
    • Replies: 1
    • Views: 3,551
    04-18-2011, 03:29 AM Go to last post
  45. Probability of a dependency

    How does one calculate the probability that a given event will occur based on the current result and given a history of a sequence. For example,...

    Started by supertrade‎, 04-16-2011 07:38 PM
    • Replies: 1
    • Views: 2,556
    04-17-2011, 02:00 AM Go to last post
  46. help with probability problem.

    Hi there.. I have this one, can you help me out?? #1- a cheese seller gets a stock of cheese for 22000 usd, the prob that he can sell the whole...

    Started by GeorgeVergel‎, 04-13-2011 10:42 AM
    • Replies: 1
    • Views: 2,352
    04-16-2011, 09:02 AM Go to last post
  47. Alternative to chi-squared test needed

    Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

    Started by jdrbaldwin‎, 04-09-2011 05:23 AM
    alternative, bernoulli, chi-square, goodness of fit, sampling
    • Replies: 5
    • Views: 8,106
    04-15-2011, 05:23 PM Go to last post
  48. φ Distribution Table

    Hi, I'm currently looking for the φ distribution table, to calcuate marginal effects in a probit model. Unfortunatly there isn't one in my...

    Started by PaulDaniel‎, 04-15-2011 05:59 AM
    • Replies: 0
    • Views: 188,807
    04-15-2011, 05:59 AM Go to last post
  49. Probability question, formula wanted

    My question is example is, if there is a drink that has a 10% chance of making a person grow taller, and I have 50 of those drinks and I sample 50...

    Started by noob0101‎, 04-14-2011 04:38 PM
    • Replies: 1
    • Views: 3,568
    04-15-2011, 12:06 AM Go to last post
  50. probability

    I just posted another question and figured it out by myself but now i'm really stuck. Any suggestions to help me through it? Any input would be...

    Started by USMstudent85‎, 04-11-2011 10:03 AM
    • Replies: 3
    • Views: 23,498
    04-14-2011, 06:19 AM Go to last post
  51. Exercise doubt

    Hello everyone, I have to do an exercise or probability and i dont know or better if i say im not sure what to do? I know i have three types of...

    Started by Ancelot327‎, 04-12-2011 08:56 PM
    • Replies: 0
    • Views: 2,766
    04-12-2011, 08:56 PM Go to last post
  52. Yet another "flipping" coin problem

    Hi folks, So we flip two balanced coins. If at least one of them shows tails what is the probability that the other coin is also tails? My answer:...

    Started by ramrad‎, 04-12-2011 01:27 PM
    • Replies: 4
    • Views: 3,569
    04-12-2011, 08:15 PM Go to last post
  53. Uniform Probability Distribution

    The driving distance for the top 100 golfers on the PGA tour is between 284.7and 310.6 yards (Golfweek, March 29, 2003). Assume that the driving...

    Started by USMstudent85‎, 04-11-2011 09:51 AM
    • Replies: 5
    • Views: 19,921
    04-11-2011, 01:53 PM Go to last post
  54. Homework problem

    Hi, Let's begin with apologize for my English, but I'm native of polish. So my problem, I was asked to figure out after what time of formal...

    Started by heldan0@gmail.com‎, 04-09-2011 04:23 PM
    • Replies: 1
    • Views: 4,021
    04-09-2011, 11:47 PM Go to last post
  55. Normal/Logistic Distribution: Sigma vs. S

    For Normal Distribution, we have the variables x, mean and sigma (standard deviation) For Logistic Distribution, we have the variables x, mean and...

    Started by StevenCraigMiller‎, 04-09-2011 10:20 PM
    • Replies: 1
    • Views: 9,495
    04-09-2011, 10:51 PM Go to last post
  56. question please help!

    Let Y1, Y2,...,Yn be independent Poisson random variables with means λ1, λ2, ...,λn, respectively. find a. probability function of Σyi( i=1 to n) ...

    Started by probabilityhelp‎, 04-08-2011 12:19 AM
    • Replies: 4
    • Views: 10,021
    04-08-2011, 01:59 AM Go to last post
  57. type 2 error probability

    Hi, I need help calculating the type 2 error probablity A Harris poll was taken to determine which of 13 major industries are doing a good job...

    Started by neraken‎, 04-08-2011 01:49 AM
    • Replies: 0
    • Views: 5,526
    04-08-2011, 01:49 AM Go to last post
  58. random variables problem

    Hello i have a few questions in probability i can't make heads or tails of. hints or answer much appreciated for question 1 assume E=E*E...

    Started by thenumber42‎, 04-07-2011 02:33 PM
    • Replies: 2
    • Views: 2,516
    04-07-2011, 08:16 PM Go to last post
  59. Sum of uniform distribution

    I would be very grateful if anyone could help me with this problem! In a market simulation I have multiple shouts i.e. bids and asks for which I...

    Started by daniel23‎, 04-07-2011 11:28 AM
    • Replies: 5
    • Views: 5,991
    04-07-2011, 01:07 PM Go to last post
  60. continuous distributions

    hey.. im struck here f(x,y)=8xy 0<y<x<1 so now how do i take the limits to integrate when i have to calculate E(XY)?

    Started by sindhu88‎, 04-02-2011 08:31 PM
    • Replies: 4
    • Views: 2,864
    04-07-2011, 12:15 PM Go to last post

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