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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: 30,238
    09-30-2005, 09:44 AM Go to last post
  1. Binomial

    machine has 3 wheels each with 40different numbers, the problem need to find the probabilty of have 3 apples in the case where 1) 3 times in...

    Started by Matt‎, 12-06-2011 09:28 AM
    • Replies: 14
    • Views: 2,808
    12-07-2011, 07:02 AM Go to last post
  2. Conditional Probability

    In order to be qualified for a job, a candidate need to pass 3 exams. If a candidate fail an exam, he can't take the next one. A random candidate...

    Started by Yankel‎, 11-26-2011 04:06 PM
    • Replies: 8
    • Views: 3,074
    12-06-2011, 08:13 PM Go to last post
  3. Question Conditional Mean & Variance

    I always get into trouble when dealing problems of conditional distribution:( please help :wave: Let Y be the number of heads obtained by tossing...

    Started by TYW‎, 12-05-2011 07:00 AM
    • Replies: 8
    • Views: 3,400
    12-06-2011, 11:15 AM Go to last post
  4. Please Help - Understanding odds within growing sample (not homework)

    This will probably sound pretty easy, but please bear with me. For my own understanding. Say I have a 100 different numbers, and every hour a...

    Started by no_stats‎, 12-06-2011 01:46 AM
    • Replies: 0
    • Views: 1,188
    12-06-2011, 01:46 AM Go to last post
  5. estimating likelihood

    First off, this isn't homework question, just trying to figure it out. Imagine you have a box with a window. You make an observation through the...

    Started by beakerboy‎, 12-02-2011 04:01 PM
    • Replies: 2
    • Views: 2,672
    12-05-2011, 02:12 PM Go to last post
  6. Probability Distribution Function

    Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

    Started by Darktranquillity‎, 12-05-2011 11:21 AM
    • Replies: 6
    • Views: 2,287
    12-05-2011, 12:28 PM Go to last post
  7. Probability Density Function

    Hello guys I just want my work to be reviewed on this exercise please :) Consider X a random variable with pdf f X (x) = (3/8) * (1-x)^2 if...

    Started by Darktranquillity‎, 12-04-2011 06:30 PM
    • Replies: 4
    • Views: 2,654
    12-05-2011, 11:04 AM Go to last post
  8. Basic Question

    Hi all, I feel a little embarrassed about this, but: what is the rule linking the probability of an event A to the weighted sum of its sub-events?...

    Started by justin.sharber‎, 12-04-2011 09:25 PM
    expectation
    • Replies: 2
    • Views: 1,364
    12-04-2011, 09:43 PM Go to last post
  9. Continuous Multi-variablel Distribution question

    I'm doing some problems with multi-variable probability distributions and marginal distributions. I think I'm doing them right, but they don't feel...

    Started by APOCooter‎, 12-03-2011 06:00 PM
    • Replies: 0
    • Views: 886
    12-03-2011, 06:00 PM Go to last post
  10. normal distribution

    Please explain me how to do that? What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all...

    Started by Asya‎, 12-03-2011 03:31 PM
    • Replies: 7
    • Views: 2,255
    12-03-2011, 05:21 PM Go to last post
  11. Poisson test help!

    Hi! I am sitting with a school assignment, but I got stuck on this one. I am suppose to test if my data is Poisson-distributed. The data has a...

    Started by RToss‎, 12-03-2011 06:35 AM
    • Replies: 4
    • Views: 2,397
    12-03-2011, 08:33 AM Go to last post
  12. Bowl with marbles

    Hi there, I have difficulties in resolving this problem: In a bowl we have 5 white marbles and 15 black marbles. What is the probability of...

    Started by tuse‎, 12-02-2011 06:18 AM
    • Replies: 4
    • Views: 2,372
    12-02-2011, 03:46 PM Go to last post
  13. Question statistical decision making

    :wave: Is it possible to know if whether an error in statistical decision making has been committed in a single study?

    Started by stat12‎, 12-01-2011 06:49 PM
    • Replies: 4
    • Views: 2,512
    12-02-2011, 01:41 PM Go to last post
  14. Age and the Vancouver Stanley Cup Riot

    Practice Question: The information below is public knowledge just released by the BC justice department which shows some people who were charged...

    Started by bsd058‎, 12-02-2011 11:23 AM
    • Replies: 1
    • Views: 2,007
    12-02-2011, 11:57 AM Go to last post
  15. Joint Probability Issues

    I'm trying to prepare for a test and going over some practice problems I just found with no solutions, and they've basically led me to believe I'm...

    Started by sumpmeh‎, 11-21-2011 12:40 PM
    dice, exponential distribution, joint probabilities, joint probability
    • Replies: 11
    • Views: 3,020
    12-02-2011, 09:53 AM Go to last post
  16. Simple Prob. Question / problem

    Hey, Im new to the forum and have loved reading and lurking over the past few weeks. I have a question my friends and I constatnly argue over and...

    Started by jo2jo‎, 12-01-2011 03:56 PM
    • Replies: 4
    • Views: 1,730
    12-01-2011, 04:26 PM Go to last post
  17. probability distribution

    Hello All, I calculated an average latency value let say 3 units then after observing the network I found that different nodes have the fallowing...

    Started by optimistbs‎, 12-01-2011 10:46 AM
    probability distributions, probability function, probability help
    • Replies: 0
    • Views: 1,214
    12-01-2011, 10:46 AM Go to last post
  18. Will decision on H0 depend on Ha

    In testing of hypthesis , will the decision of whether to accept or reject depend on the tail of the test ? That is suppose Ha M<0 and Ha!=0. In...

    Started by jeevanbmanoj‎, 11-30-2011 11:07 PM
    • Replies: 3
    • Views: 2,251
    12-01-2011, 02:02 AM Go to last post
  19. How to find sign of z

    In a normal Distribution 31% of the item are under 45 and 8 % are above 64.Find its mean and SD? In a normal Distribution 31% of the item are under...

    Started by jeevanbmanoj‎, 11-30-2011 11:02 PM
    • Replies: 1
    • Views: 2,235
    12-01-2011, 12:20 AM Go to last post
  20. testing of Hypothesis

    How to identify if the population is same or different? The heights of six randomly chosen sailors are inches 63,65,58,69,71 and 72.The heights of...

    Started by jeevanbmanoj‎, 11-30-2011 11:03 PM
    • Replies: 2
    • Views: 1,714
    11-30-2011, 11:12 PM Go to last post
  21. Bayesian Statistics

    A logistic regression model for a binary outcome Y given x is given by P(Y=1) = exp(a +bx)/(1+exp(a+bx)) Assume a prior distribution f(a,b)...

    Started by MaxMan‎, 11-26-2011 08:25 PM
    • Replies: 3
    • Views: 1,869
    11-29-2011, 02:44 PM Go to last post
  22. Probability of failure for average of multiple samples from normal distribution

    Hello - my attempt at this one resulted in a huge calculation, though it seems like a simple problem. There must be a better way! I have a normally...

    Started by Markoh‎, 11-29-2011 05:53 AM
    • Replies: 3
    • Views: 3,193
    11-29-2011, 02:23 PM Go to last post
  23. Promotion Probability

    We are giving away a vehicle as a promotion. Four people will be selected. They will each have a game board in front of them which consists of the...

    Started by WN_Casino‎, 11-29-2011 11:37 AM
    • Replies: 3
    • Views: 1,857
    11-29-2011, 02:09 PM Go to last post
  24. Special interest groups want my money

    and they say that they lobbied for so-and-so bill and it passed and so I am to conclude that they are effective. Aside from a controlled...

    Started by Outlier‎, 11-28-2011 07:21 PM
    • Replies: 5
    • Views: 2,134
    11-29-2011, 11:54 AM Go to last post
  25. Weighted multivariate hypergeometric distribution?

    Hi, I'm writing a simulation where part of it can be done using the following steps: 1. Choose 1 element from with probability without...

    Started by Ben1979‎, 11-25-2011 10:40 AM
    • Replies: 4
    • Views: 3,202
    11-28-2011, 07:05 PM Go to last post
  26. help for task in R programming language

    This is my task. I don't know how to solve it in R studio. Please help me!!! Simulate: a) 15 values from N(0,1) distribution b) 50 values from...

    Started by zemzela‎, 11-27-2011 05:24 AM
    density function, means, plot, r programming help, standard deviation
    • Replies: 4
    • Views: 2,894
    11-28-2011, 12:35 PM Go to last post
  27. *Rate of Ruin & Optimal N

    For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

    Started by coolcat‎, 11-26-2011 02:53 AM
    • Replies: 13
    • Views: 3,874
    11-28-2011, 12:21 PM Go to last post
  28. Expected value of logarithm of determinant of Wishart-distributed matrix

    Does anyone know a simple, or at least tractable, formula for E, where W is a real Wishart-distributed matrix? It seems like there ought to be one,...

    Started by Daniel Dvorkin‎, 11-27-2011 03:16 PM
    determinant, log-determninant, multivariate, wishart
    • Replies: 3
    • Views: 4,900
    11-27-2011, 11:52 PM Go to last post
  29. Floor function

    A famous pianist will be recording her latest CD of Beethoven's Moonlight Sonata today. Once she arrives to the recording studio she will play the...

    Started by nckgldn‎, 11-27-2011 05:20 PM
    • Replies: 2
    • Views: 2,143
    11-27-2011, 07:51 PM Go to last post
  30. Help with a problem.

    Problem: 2. Photocards-R-Us is a photo card printer. For this year, they have found that 10% of the cards they make are of inferior quality (blurred...

    Started by centurion1‎, 11-26-2011 06:10 PM
    • Replies: 7
    • Views: 2,382
    11-27-2011, 07:40 AM Go to last post
  31. Help please with the problem

    W is a standard exponential distribution. Q is distributed uniformly on W and Q are independent. R=sqrt(2W) -pi/2<=a<=pi/2 - constant. ...

    Started by Slavko‎, 11-26-2011 09:29 PM
    bivariate normal, exponential, uniform, wcos(q)
    • Replies: 1
    • Views: 1,565
    11-27-2011, 03:03 AM Go to last post
  32. Probability & Food Poisoning

    Could the probability of this situation be calculated? Seven of my family members contracted food poisoning. The health department says we must of...

    Started by Dralter‎, 11-26-2011 04:32 PM
    • Replies: 1
    • Views: 4,997
    11-26-2011, 06:10 PM Go to last post
  33. Monte carlo conditioning

    I am trying to learn how to reduce variance with conditioning. page 15 in these lecture notes: http://www.columbia.edu/~mh2078/MCS_Var_Red1.pdf ...

    Started by alf‎, 11-23-2011 04:02 PM
    • Replies: 13
    • Views: 3,036
    11-26-2011, 10:43 AM Go to last post
  34. Complicated Probability

    Q1. Suppose that four regular 6-sided dice are flipped. 1.What is the probability of a "three-of-a-kind" that is, three of the dice show the same...

    Started by mesha‎, 11-23-2011 12:08 AM
    • Replies: 1
    • Views: 1,797
    11-23-2011, 01:53 AM Go to last post
  35. Probability Problem - How many events needed?

    I am trying to figure out how to calculate how many samples of a population I would need to take in order to get a true representation of the total...

    Started by tuenov‎, 11-22-2011 12:37 PM
    • Replies: 1
    • Views: 1,930
    11-22-2011, 02:47 PM Go to last post
  36. help please probability

    A Lumber Company has three sawmills which produce boards of different lengths. The following table is a joint frequency distribution based on a...

    Started by saddawyah q6r‎, 11-22-2011 10:14 AM
    • Replies: 1
    • Views: 3,499
    11-22-2011, 10:24 AM Go to last post
  37. probability strings

    So I am having trouble with a homework problem. its called probability strings. Take 6 pieces of twine, each about 1 foot long. Place the six...

    Started by brink21‎, 11-21-2011 12:31 PM
    • Replies: 3
    • Views: 2,493
    11-21-2011, 02:18 PM Go to last post
  38. permutation questions

    Having a lot of trouble with this question and subquestions below. I answer each one and just wondering if on the right track? You belong to a...

    Started by misterurs‎, 11-20-2011 10:37 PM
    • Replies: 0
    • Views: 1,731
    11-20-2011, 10:37 PM Go to last post
  39. please i need help with my HW

    hello i have question in my home work that i was tried to solve it but unfortunate i can't the question: Harrison Water Sports has three...

    Started by saddawyah q6r‎, 11-19-2011 08:03 AM
    • Replies: 4
    • Views: 4,904
    11-19-2011, 02:37 PM Go to last post
  40. Characteristic function of the Gamma distribution

    I have not been able to find anywhere a rigorous derivation of the characteristic function of the Gamma distribution. Any suggestions?

    Started by Pandoga‎, 11-17-2011 12:30 PM
    • Replies: 3
    • Views: 16,139
    11-18-2011, 03:41 AM Go to last post
  41. Confidence interval estimate - distribution binomial, variable when positive

    Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

    Started by Meli‎, 11-17-2011 02:12 PM
    tobit; binomial;wald test
    • Replies: 2
    • Views: 2,939
    11-18-2011, 02:07 AM Go to last post
  42. Need help with joint distribution involving cauchy distributions

    Okay so I know that help is only given to those who show effort, but I'm totally stuck on this one, I don't even know where to start. I know what the...

    Started by iiiiaann‎, 11-16-2011 11:52 PM
    cauchy, joint distribution, random variables
    • Replies: 3
    • Views: 2,906
    11-17-2011, 12:48 AM Go to last post
  43. Help required with a linguistics-related probability problem

    Hello all, As someone with very little background in probability theory, I have come across a problem in the writing of my linguistics MSc thesis...

    Started by Viaveritsa‎, 11-16-2011 12:50 PM
    • Replies: 6
    • Views: 2,046
    11-16-2011, 03:34 PM Go to last post
  44. Converting a Wide Sense CycloStationary process into a Wide Sense Stationary process

    Hello everybody :) I have a bit of a problem with understanding the conversion from a WSCS process X(t) to a WSS process Y(t) = X(t - \Delta) ....

    Started by Alex On The Moon‎, 11-16-2011 05:36 AM
    • Replies: 0
    • Views: 1,960
    11-16-2011, 05:36 AM Go to last post
  45. Independence between x1 and x2+x3+,,,+xn

    Hi, I've wondered whether X1 and X2+X3+,,,+Xn(=Z) are stochastically independent or not where X1, X2, ,,, Xn ~iid poisson(Lamda). And Today, I...

    Started by subspaces‎, 11-10-2011 06:18 AM
    • Replies: 1
    • Views: 2,162
    11-16-2011, 02:35 AM Go to last post
  46. Probability Question

    Hi guys, I need some help with this question, I don't have answers, not even final, so any attempt is useless... from an urn with 10 balls...

    Started by Yankel‎, 11-14-2011 01:58 PM
    • Replies: 1
    • Views: 1,671
    11-16-2011, 02:09 AM Go to last post
  47. Question about exponential distribution

    Okay, because P(Y) is an exponential function with mean of 10, I know a=1, B=10 P(Y) = (1/B)e^(-y/B), or (1/10)e^(-y/10). I'm stuck with what to do...

    Started by APOCooter‎, 11-15-2011 03:40 PM
    • Replies: 3
    • Views: 6,612
    11-16-2011, 12:00 AM Go to last post
  48. a question for Makov inequality

    Given 0<\lambda<1, can we show \mathrm{P}\le \sum _{i=1}^{n} E/\epsilon^{\lambda}? I think we can get the result by Markov inequality if we know...

    Started by JoeW‎, 11-14-2011 06:43 PM
    • Replies: 3
    • Views: 3,535
    11-15-2011, 05:49 PM Go to last post
  49. Trivial question

    Hi All, This is my first post here so be gentle. I've the following question: Suppose you have a parameter X, given by X=g(Y), that could only...

    Started by jpcgandre‎, 11-14-2011 03:58 PM
    • Replies: 6
    • Views: 2,566
    11-15-2011, 06:58 AM Go to last post
  50. joint distribution of f(x,y)

    joint distribution f(x,y) = (1/4)xy if 0<x<2, 0<y<2 = 0 otherwise how to find P(XY<2)? I wrote it out as ∫(from 2...

    Started by hphsu‎, 11-14-2011 08:48 PM
    • Replies: 4
    • Views: 3,037
    11-15-2011, 02:21 AM Go to last post
  51. show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

    Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

    Started by alias‎, 11-13-2011 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 14,512
    11-14-2011, 02:40 AM Go to last post
  52. A problem using Bayes Inference

    This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

    Started by carfield‎, 11-13-2011 07:30 PM
    • Replies: 1
    • Views: 2,487
    11-14-2011, 12:27 AM Go to last post
  53. A probability confusion

    There are two packs of cards. pack A and pack B. A = {11, 12, 13, 15, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32} B = {11. 13. 15. 21. 22, 35}...

    Started by lihinii‎, 11-13-2011 07:25 PM
    • Replies: 1
    • Views: 2,852
    11-14-2011, 12:03 AM Go to last post
  54. A two-outcome game on a limited budget: the probability of being busted over n tries

    Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really...

    Started by smart_mask‎, 11-12-2011 02:43 PM
    binomial distribution, limited budget, two-outcome bet
    • Replies: 2
    • Views: 2,200
    11-13-2011, 03:37 AM Go to last post
  55. question regarding distribution mean (app Crystal Ball)

    Hi everyone, I have a question that I have come across running some Crystal Ball simulations however, I think the problem is rather a generic...

    Started by david.‎, 11-11-2011 04:39 AM
    • Replies: 1
    • Views: 2,416
    11-11-2011, 05:27 AM Go to last post
  56. CDF of difference of chi squared random variables

    Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

    Started by rhz‎, 11-10-2011 01:15 PM
    • Replies: 1
    • Views: 8,622
    11-10-2011, 03:50 PM Go to last post
  57. statistics of sinc function with normal argument

    Hi, Can anyone point me to the pdf, cdf, moments, etc of y = sinc(x) = sin(pi*x)/(pi*x) where x ~ N(0,s^2)? Thanks!

    Started by rhz‎, 11-10-2011 01:21 PM
    • Replies: 0
    • Views: 3,082
    11-10-2011, 01:21 PM Go to last post
  58. probability question

    I have a probability question. It also relates to computer networks but I figured I would try posting it here. The question deals with packets...

    Started by redhawk87‎, 11-09-2011 10:43 PM
    probability
    • Replies: 1
    • Views: 3,263
    11-10-2011, 12:55 AM Go to last post
  59. What is the meaning of kurtosis?

    I found in Wikipedia that kurtosis is measurement of peakiness of the famous bell curve. If kurtosis is more than 3, it is kind of peaky, if kurtosis...

    Started by insight‎, 12-04-2007 05:30 AM
    • Replies: 10
    • Views: 25,194
    11-09-2011, 12:39 PM Go to last post
  60. Consistent Estimator

    I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

    Started by alf‎, 11-06-2011 07:10 PM
    • Replies: 4
    • Views: 6,222
    11-09-2011, 11:41 AM Go to last post

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