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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: 30,399
    09-30-2005, 09:44 AM Go to last post
  1. Random-walk models

    Recently read about an example of the random-walk in an old Astrophysics book I picked up when they were cleaning out the college library. Anyone...

    Started by freebird2008‎, 09-19-2010 08:36 PM
    • Replies: 0
    • Views: 2,551
    09-19-2010, 08:36 PM Go to last post
  2. Rv

    An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

    Started by sajee3a‎, 09-18-2010 01:54 AM
    • Replies: 1
    • Views: 1,958
    09-19-2010, 03:39 PM Go to last post
  3. Easy normal dist

    A heating/cooling company advertises that any customer buying an air conditioner during the first 16 days of December will receive a 25% discount if...

    Started by SadieKhan‎, 09-18-2010 11:45 AM
    • Replies: 3
    • Views: 3,290
    09-19-2010, 11:47 AM Go to last post
  4. Probability Question

    I am a little confused on what formula I should use here. I understand if you don't want to give me the answer. I just want to be pointed in the...

    Started by ang6705‎, 09-18-2010 06:43 PM
    • Replies: 3
    • Views: 2,654
    09-18-2010, 08:50 PM Go to last post
  5. Exclamation URGENT HELP! Markov chain and life insurance

    Hi there. For one of my statistics courses, I have been given a question about "Equivalence principle" in regard to life insurance. For this...

    Started by TheFirstOrder‎, 09-18-2010 07:36 AM
    • Replies: 0
    • Views: 2,590
    09-18-2010, 07:36 AM Go to last post
  6. random variables

    compute xbar=integral xf(x)dx for the continous distribution: exponential:f(x)=u(x)lambda e^-lambdax. compute x^2bar

    Started by sajee3a‎, 09-15-2010 11:12 PM
    • Replies: 8
    • Views: 3,799
    09-18-2010, 02:38 AM Go to last post
  7. Need help asap! Please help

    There are three teams in a cross-country race. Team A has five runners, team B has six runners, and team C has seven runners. In how many ways can...

    Started by lilcutee14life‎, 09-09-2010 11:54 PM
    • Replies: 9
    • Views: 8,075
    09-16-2010, 07:06 PM Go to last post
  8. Markov Chain: Absorbtion Probability and Hitting Time

    Hi Suppose i have a markov chain with state (0,1,2,3) whose transition matrix looks like this .25, 0, .5, .25 .2, .2, 0, .6 0, 0, 1, 0 ...

    Started by lrado1‎, 09-14-2010 07:33 AM
    • Replies: 3
    • Views: 7,018
    09-15-2010, 07:34 AM Go to last post
  9. need help with proof issues

    1) given: (1+x)^n =SUM nCk X^k, prove that SUM nCk p^k q^n-k =1,where p+q=1 2)prove the general law of addition:P(E1 U E2 U......U En)=SUM...

    Started by sajee3a‎, 09-13-2010 02:28 PM
    • Replies: 14
    • Views: 4,886
    09-14-2010, 04:04 PM Go to last post
  10. Exclamation Challenge

    E1,E2,....,En are events; P is the probability that at least one of them occurs. a)show that SUM P(Ei)-SUM{i<j}P(EiEj) <= P<= SUM P(Ei) ...

    Started by sajee3a‎, 09-14-2010 02:06 AM
    • Replies: 2
    • Views: 2,753
    09-14-2010, 01:33 PM Go to last post
  11. these problems are due today..HELP

    a penny is tossed from a distance onto a large table ruled in 1 inch sqaures.the penny is 3/4 inch in diam.find: 1)probability that it will fall...

    Started by sajee3a‎, 09-14-2010 01:58 AM
    • Replies: 5
    • Views: 3,292
    09-14-2010, 01:30 PM Go to last post
  12. Normal Distribution

    Hi, I ask this question in relation to a commerce project which I am working on in regards to the probability distributions of operating profits. ...

    Started by theorbb‎, 09-13-2010 02:52 AM
    • Replies: 7
    • Views: 3,481
    09-14-2010, 11:54 AM Go to last post
  13. unfair coin problem

    im stuck with a part of a problem which is : An unfair coin (p{h}=p=0.6) is tossed n=20 times. FIND the probability that the number of heads k is...

    Started by sajee3a‎, 09-13-2010 03:41 PM
    • Replies: 8
    • Views: 6,661
    09-14-2010, 01:46 AM Go to last post
  14. Hypergeometric distribution problem

    A purchaser receives small lots (N = 25) of a high precision device. She wishes to reject the lot 95% of the time if it contains as many as seven...

    Started by pearl‎, 09-13-2010 09:46 AM
    • Replies: 8
    • Views: 6,722
    09-13-2010, 02:49 PM Go to last post
  15. find the probability of an event given a guassian distribution

    This seems like such a simple question, and I should know it, but for some reason I cannot figure it out and cannot find an answer via googling I...

    Started by omnirizon‎, 09-13-2010 12:33 PM
    • Replies: 0
    • Views: 2,063
    09-13-2010, 12:33 PM Go to last post
  16. Bayes' Theorem and Conditional Probability

    Hello! So I have a question with regards of a mix of results. I want to change the posterior into a form I know. \mathbb{P}\left( \mu | y,H_1...

    Started by risorial‎, 09-08-2010 02:10 PM
    • Replies: 2
    • Views: 2,621
    09-12-2010, 06:35 PM Go to last post
  17. conditional probability and mgf question

    Hi i'm having trouble doing this question, any help would be much appreciated The time needed to defuse the bomb is modeled by a continuous...

    Started by lrado1‎, 09-12-2010 09:55 AM
    • Replies: 2
    • Views: 4,741
    09-12-2010, 05:44 PM Go to last post
  18. Unhappy Absolute risk reduction

    Delete it please

    Started by SadieKhan‎, 09-12-2010 03:38 AM
    • Replies: 0
    • Views: 3,162
    09-12-2010, 03:38 AM Go to last post
  19. can anyone help on this one?

    Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

    Started by tennis89‎, 09-10-2010 07:00 PM
    • Replies: 4
    • Views: 2,463
    09-11-2010, 10:04 AM Go to last post
  20. Die throwing game

    A fair die is thrown a number of times and every time we count the number of dots (cumulative), until the total number of dots is bigger than or...

    Started by Ego7894612‎, 09-09-2010 07:26 AM
    • Replies: 7
    • Views: 4,844
    09-10-2010, 02:37 PM Go to last post
  21. Sampling distributions of estimates question?

    Hi there, I'm stuck on a question regarding the chap. in our course called: Sampling distributions of estimates. Here is the question: My thoughts...

    Started by SwatKats‎, 09-09-2010 07:20 AM
    • Replies: 3
    • Views: 5,352
    09-10-2010, 06:16 AM Go to last post
  22. what is predictive power?

    Can anyone please tell me what is meant by 'predictive power' of a statement? what is it represented as? Thanks

    Started by godsaveme‎, 09-08-2010 07:20 PM
    • Replies: 0
    • Views: 5,488
    09-08-2010, 07:20 PM Go to last post
  23. sample percentage contained within symmetric limits

    Hi! Thank you in advance for assisting with my question. I am working on a probability question and am able to answer almost all of it except one...

    Started by ealeql‎, 09-07-2010 10:44 PM
    • Replies: 3
    • Views: 23,133
    09-08-2010, 10:57 AM Go to last post
  24. My probability practise

    Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

    Started by SadieKhan‎, 09-07-2010 02:28 PM
    • Replies: 4
    • Views: 5,094
    09-08-2010, 04:30 AM Go to last post
  25. calculating stddev from ci - gamma dist

    Hi all, I'm trying to figure out the standard deviation of a gamma distribution armed only with the mean and 90% confidence interval (1.86 for...

    Started by jefflovejapan‎, 09-05-2010 09:14 PM
    • Replies: 9
    • Views: 4,226
    09-07-2010, 04:18 AM Go to last post
  26. Binomial distribution variace q

    Given a scenario where there is a true statistic - proportion voting yes in a vote denoted by p ,we sample people from the large population, n . ...

    Started by devlin‎, 09-06-2010 04:24 PM
    • Replies: 0
    • Views: 2,224
    09-06-2010, 04:24 PM Go to last post
  27. Random walk on a clock

    Consider the numbers 1, 2,..., 12 written around a ring as they usually are on a clock. Consider a Markov chain that at any point jumps with equal...

    Started by Ego7894612‎, 09-05-2010 12:13 PM
    • Replies: 5
    • Views: 9,663
    09-05-2010, 10:22 PM Go to last post
  28. Predicting server load for MMORPG

    deleted content

    Started by CharlesD‎, 09-05-2010 03:50 PM
    • Replies: 0
    • Views: 2,708
    09-05-2010, 03:50 PM Go to last post
  29. Is it a tricky question?

    When many small businesses were surveyed, 82.2% said they employed women in some capacity. Of the businesses that employed women, 17.5% employed no...

    Started by SadieKhan‎, 09-03-2010 02:08 PM
    • Replies: 6
    • Views: 3,432
    09-04-2010, 01:55 AM Go to last post
  30. [Homework help] Binomial distribution questions

    After the BP oil crisis in the Gulf, sixty percent of Americans are in favor of the government’s moratorium on deepwater oil drilling. Out of the...

    Started by Tote6000‎, 09-02-2010 09:07 PM
    • Replies: 9
    • Views: 4,185
    09-03-2010, 04:47 PM Go to last post
  31. Another question

    To ascertain the effectiveness of the advertising campaign for the Red Cross Annual Appeal on donations, a telephone survey of 309 Brisbane residents...

    Started by SadieKhan‎, 09-03-2010 07:19 AM
    • Replies: 3
    • Views: 2,218
    09-03-2010, 07:34 AM Go to last post
  32. Poisson process, order statistics problem

    Starting at some fixed time, satellites are launched at times of a Poisson process with rate lambda. After an independent amount of time having...

    Started by Ego7894612‎, 09-02-2010 09:21 PM
    • Replies: 1
    • Views: 6,556
    09-03-2010, 06:55 AM Go to last post
  33. help plz

    The Personal Computer magazine surveyed its readers to determine how likely it was that people who planned to purchase their next computer would buy...

    Started by SadieKhan‎, 09-03-2010 05:56 AM
    • Replies: 1
    • Views: 2,498
    09-03-2010, 06:33 AM Go to last post
  34. 95% CI is Insignificant, P-Value is Significant

    Suppose you're performing a 2x2 contingency table analysis. You do your Chi Square or Fisher Exact test, as appropriate, then you calculate an odds...

    Started by StatNinja‎, 09-02-2010 01:54 PM
    • Replies: 2
    • Views: 10,057
    09-02-2010, 10:21 PM Go to last post
  35. Sigma Algebra Proof

    Hello, I am having trouble with the following probability question, and I would be grateful for some assistance with it. (I have attached it to the...

    Started by AdvoTDV‎, 09-02-2010 08:49 AM
    • Replies: 2
    • Views: 4,306
    09-02-2010, 01:48 PM Go to last post
  36. Binomial expected value

    I think the answer to this is painfully obvious, but I need to be certain. Consider some binomial distribution where the probability of a single...

    Started by Salohcin‎, 09-02-2010 12:04 PM
    • Replies: 1
    • Views: 3,165
    09-02-2010, 12:08 PM Go to last post
  37. Poisson process, last arrival in interval

    Consider a Poisson process with rate lambda. Let L be the following r.v.: if there is an arrival in , then L is the time of the last arrival in ; if...

    Started by Ego7894612‎, 09-01-2010 09:24 PM
    • Replies: 1
    • Views: 4,568
    09-02-2010, 08:48 AM Go to last post
  38. project help with poisson distribution

    Hi. i am a computer science student and i am given a networking related project to make in my final term. and this project includes statistics in 3...

    Started by ghazanfer‎, 09-01-2010 09:09 PM
    • Replies: 0
    • Views: 2,554
    09-01-2010, 09:09 PM Go to last post
  39. Poisson process, payment, standard deviation

    We have an insurance company that pays out claims at times of a Poisson process, with rate 4 per week. Suppose that the mean payment is 10K dollar...

    Started by Ego7894612‎, 08-31-2010 08:59 AM
    • Replies: 6
    • Views: 7,407
    09-01-2010, 09:06 PM Go to last post
  40. HELP with Probability Result

    HI During the course of some proof, I encountered the following given by the author and I cannot figure for the love of God how he came by this...

    Started by siavashbabaei‎, 09-01-2010 02:42 PM
    • Replies: 0
    • Views: 2,872
    09-01-2010, 02:42 PM Go to last post
  41. the oldest 100

    I’m studying activity (number of posts) for the first 100 users on an social network. It is skewness distribution. I am trying to find out if there...

    Started by maria_t‎, 09-01-2010 04:15 AM
    • Replies: 2
    • Views: 2,461
    09-01-2010, 02:26 PM Go to last post
  42. regression of multple populations in one dataset

    Hi, I have a dataset (x,y) that contain several populations with their own trends. I would want to perform regression on each one separately, but...

    Started by pimk‎, 08-30-2010 02:42 PM
    • Replies: 7
    • Views: 3,618
    08-31-2010, 09:00 AM Go to last post
  43. Conditional ev,big problem with definition

    I jus dont seem to understand this concept "conditional e.v." I do know the definitions: joint density f_X,Y , conditional density of X given Y=y,...

    Started by corneel‎, 08-27-2010 09:38 PM
    • Replies: 3
    • Views: 3,122
    08-28-2010, 12:26 PM Go to last post
  44. Unhappy Finding the right Gamma distribution

    Hi all, I am a Masters Student working on a simulation model. As part of model construction I have to assign probability distributions for each...

    Started by yayo1984‎, 08-27-2010 12:53 AM
    • Replies: 3
    • Views: 4,737
    08-27-2010, 11:54 PM Go to last post
  45. Conditional expectation, three exponential distributed r.v.

    First post... Let A, B and C be independent exponential distributed random variables with parameters lambda_A, lambda_B and lambda_C,...

    Started by Ego7894612‎, 08-27-2010 04:08 PM
    • Replies: 2
    • Views: 2,586
    08-27-2010, 07:20 PM Go to last post
  46. Unhappy Probability Question..urgent

    Can somebody help me by solving the below mentioned proble? A survey reports that 62% of callers to a help desk complain about the service if...

    Started by arun_899‎, 08-27-2010 05:08 AM
    • Replies: 5
    • Views: 3,515
    08-27-2010, 10:00 AM Go to last post
  47. Is it possible to calculate a binomial distribution with a non-constant p?

    Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

    Started by jonnybgood‎, 08-25-2010 11:05 AM
    • Replies: 4
    • Views: 4,516
    08-26-2010, 12:04 AM Go to last post
  48. Profit and Probability

    Given a game with a probability of 1/x and a payout of y:1 where y=x/2 and a number of players n, where n>x and n%x=0. Build a distribution of...

    Started by calleo‎, 08-24-2010 06:30 AM
    • Replies: 3
    • Views: 4,421
    08-25-2010, 10:22 AM Go to last post
  49. True or false?

    Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

    Started by Cookie‎, 08-23-2010 09:08 PM
    • Replies: 10
    • Views: 5,342
    08-24-2010, 11:26 PM Go to last post
  50. Bayes' Theorem and improper priors

    Hello! I know Bayes' Theorem applies to both discrete and continuous probability distributions, and also seeing as how, given certain conditions,...

    Started by risorial‎, 08-24-2010 02:51 PM
    • Replies: 0
    • Views: 2,530
    08-24-2010, 02:51 PM Go to last post
  51. Unhappy Central limit problem

    Hi, I've been struggling with the below and have no idea how to tackle it. I've looked at the mgf but this doesn't seem to work out. Intuitively I...

    Started by Gekko‎, 08-23-2010 09:42 PM
    • Replies: 3
    • Views: 2,998
    08-24-2010, 10:30 AM Go to last post
  52. Question Minimization of joint pdf

    I want to find out that, for which combination of probability distributions of random variables X and Y, we have minimum joint entropy H(X,Y), ...

    Started by smohantycs‎, 08-21-2010 06:05 PM
    • Replies: 9
    • Views: 3,041
    08-22-2010, 09:05 PM Go to last post
  53. Competition scoring problem

    Not a homework question; a real scenario that I think should be determinable but I don't know how to... x number of people will enter a poker...

    Started by GRM‎, 08-22-2010 02:15 PM
    • Replies: 0
    • Views: 2,104
    08-22-2010, 02:15 PM Go to last post
  54. Hung jury

    12 jurors are only able to agree on one count out of 24 while 11 agree on all counts. There is one holdout. How would the likelihood that this...

    Started by Outlier‎, 08-21-2010 02:48 PM
    • Replies: 2
    • Views: 3,464
    08-21-2010, 08:11 PM Go to last post
  55. Red face probability help

    :shakeheadCan anyone please help me solve these problem or reccommend which book that i can find on the net to solve these problem Q1.)The...

    Started by Luke Luvevou‎, 08-19-2010 08:13 PM
    • Replies: 1
    • Views: 4,990
    08-19-2010, 09:02 PM Go to last post
  56. Question Calculating Joint Probability

    If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

    Started by smohantycs‎, 08-17-2010 10:18 PM
    • Replies: 4
    • Views: 8,747
    08-19-2010, 02:11 PM Go to last post
  57. Density and Median

    Help please :confused: The diameter of a ball is a random variable X with the next density: 2x if 0<x<=0.5 1 if...

    Started by Yankel‎, 08-04-2010 06:39 AM
    • Replies: 2
    • Views: 2,098
    08-19-2010, 12:12 PM Go to last post
  58. Probability Simulation Software Recommendation

    I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

    Started by bpbenda‎, 08-14-2010 08:10 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,027
    08-19-2010, 10:59 AM Go to last post
  59. Clustering in SPSS

    Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according...

    Started by weakatstats‎, 08-16-2010 07:32 PM
    • Replies: 4
    • Views: 3,410
    08-18-2010, 04:36 PM Go to last post
  60. Normal random variable question

    Hi I'm stuck on this question... I know how to do part a) but I really don't understand how to go about part b). Do I just substitute in x^2 for...

    Started by neild‎, 08-15-2010 05:50 AM
    • Replies: 1
    • Views: 3,089
    08-15-2010, 09:28 AM Go to last post

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