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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: 31,159
    09-30-2005, 09:44 AM Go to last post
  1. Convergence in Probability

    Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The...

    Started by sacamantecas‎, 10-13-2014 03:42 PM
    • Replies: 2
    • Views: 1,545
    10-13-2014, 04:10 PM Go to last post
  2. Simple Bernoulli question

    I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It...

    Started by noetsi‎, 10-10-2014 04:54 PM
    • Replies: 13
    • Views: 3,588
    10-13-2014, 03:24 PM Go to last post
  3. Drwaing the probability distribution of the population from a sample

    Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw...

    Started by SWDave‎, 10-13-2014 04:48 AM
    • Replies: 1
    • Views: 1,287
    10-13-2014, 01:08 PM Go to last post
  4. Please help me start this question.

    Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

    Started by LH-‎, 10-11-2014 04:06 PM
    dice, probability, unfair
    • Replies: 8
    • Views: 2,699
    10-12-2014, 11:19 AM Go to last post
  5. Simple but quite confusing Problem

    Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any...

    Started by sk6398‎, 10-12-2014 03:55 AM
    expected value, probability
    • Replies: 1
    • Views: 1,667
    10-12-2014, 10:49 AM Go to last post
  6. Negative Binomial Distribution

    Hi, Regards

    Started by aravindavvaru‎, 10-12-2014 08:54 AM
    binomial, geometric distributions
    • Replies: 0
    • Views: 1,684
    10-12-2014, 08:54 AM Go to last post
  7. Please help me in these questions

    I have these problem can you help me

    Started by nmsm‎, 10-10-2014 12:53 AM
    • Replies: 2
    • Views: 1,604
    10-10-2014, 03:37 PM Go to last post
  8. Probability theory: The Quantum Measurement Problem

    There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or...

    Started by Michaelamcshane‎, 10-09-2014 10:24 AM
    probability question, quantum measurement, wave interference
    • Replies: 2
    • Views: 3,201
    10-10-2014, 08:29 AM Go to last post
  9. probability question

    Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if...

    Started by LIPI‎, 10-09-2014 02:09 PM
    • Replies: 0
    • Views: 4,894
    10-09-2014, 02:09 PM Go to last post
  10. Difference of expectations of RV's given arbtrary pdfs

    I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x...

    Started by frito898‎, 10-08-2014 05:23 PM
    • Replies: 1
    • Views: 1,627
    10-09-2014, 04:23 AM Go to last post
  11. Chi square test: how to solve this one ?

    A dentist observed that most of the patients have cavities in their teeths at the right-side of their mouth. (see data: observed values) The...

    Started by IntoTheLibrary‎, 09-16-2014 08:59 AM
    • Replies: 1
    • Views: 1,413
    10-08-2014, 10:14 AM Go to last post
  12. Probability that X restaurants will be visited if Y people choose independently

    I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants...

    Started by JPC‎, 10-07-2014 04:53 PM
    expected value, probability help
    • Replies: 2
    • Views: 2,039
    10-08-2014, 07:37 AM Go to last post
  13. Prob: Normal probability distribution

    The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website,...

    Started by kp2‎, 10-07-2014 07:12 PM
    • Replies: 1
    • Views: 11,491
    10-07-2014, 07:39 PM Go to last post
  14. two normal distributions

    the post no longer relevant - outdated

    Started by random variable‎, 10-06-2014 06:17 PM
    • Replies: 0
    • Views: 2,161
    10-06-2014, 06:17 PM Go to last post
  15. Expected values K-S test for Normality

    Hi all, I do have a question, given are 12 observed values (see SPSS outprint in attachment) 4,1 4,3 4,6 4,9 5,0 5,1 5,1

    Started by Java‎, 10-01-2014 02:16 PM
    • Replies: 3
    • Views: 1,700
    10-06-2014, 10:15 AM Go to last post
  16. Need help to prove professor may have altered grades at our university

    We had a class of 15 students who took an exam: test scores were: 56, 65, 65, 54, 28, 65, 55, 47, 68, 41, 71, 86, 65, 67, 65 respectively on a non...

    Started by swamifez‎, 10-04-2014 04:36 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,993
    10-05-2014, 07:45 PM Go to last post
  17. Lightbulb inverse of the student`s t-distribution

    Hi All, I am trying to use calculate for two-tailed inverse of the student`s t-distribution function presented by Excel functions like...

    Started by andreja‎, 10-03-2014 11:36 AM
    • Replies: 3
    • Views: 1,872
    10-03-2014, 12:27 PM Go to last post
  18. Mean/Var for Loss rate given Loss and Balance

    We have a variable X (Loss Dollars) with known Mean and Stdev, and variable Y (Balance) with known Mean and Stdev. Letís also assume we know the...

    Started by St210‎, 10-02-2014 09:38 AM
    • Replies: 0
    • Views: 1,484
    10-02-2014, 09:38 AM Go to last post
  19. Process Control

    Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

    Started by PresterJohn‎, 09-30-2014 09:28 AM
    • Replies: 7
    • Views: 2,650
    10-01-2014, 09:34 AM Go to last post
  20. Lightbulb inverse of the student`s t-distribution

    Dear All, I have a issue about two-tailed inverse of the student`s t-distribution. I am trying to use calculation for two-tailed inverse of the...

    Started by andreja‎, 10-01-2014 05:52 AM
    • Replies: 0
    • Views: 1,373
    10-01-2014, 05:52 AM Go to last post
  21. How to calculate variance of binomial variable where base (n) is binomial also

    Hi I have a survey that collects data from each respondent on gender and also on attitudes. We don't know in advance how many men or women will...

    Started by hughm‎, 10-01-2014 02:46 AM
    binomial distribution
    • Replies: 0
    • Views: 1,336
    10-01-2014, 02:46 AM Go to last post
  22. Identify Statistically Significant Data Point when Mean/Variance Unknown

    I am conducting a screen of a wide range of compounds and generating measurements for their effect on a protein. We have conducted some work on...

    Started by alexllew‎, 09-30-2014 05:11 AM
    • Replies: 0
    • Views: 2,459
    09-30-2014, 05:11 AM Go to last post
  23. is the dice average?- theory discussion

    i throw a dice 300times. attahced picture is the result. the question is whether the dice is average? if i do not use any tool, the 5points face is...

    Started by nicegirl‎, 09-27-2014 10:33 PM
    • Replies: 13
    • Views: 2,456
    09-28-2014, 10:40 PM Go to last post
  24. probability density function

    I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

    Started by askazy‎, 09-28-2014 04:00 PM
    • Replies: 0
    • Views: 1,324
    09-28-2014, 04:00 PM Go to last post
  25. Probability of winning an n-game series

    With the baseball playoffs coming up, I was fiddling around with how to calculate the probability that one team would win a playoff series, given P,...

    Started by Jennifer Murphy‎, 09-28-2014 01:41 AM
    • Replies: 3
    • Views: 3,417
    09-28-2014, 03:48 PM Go to last post
  26. Baccalaureate Preferences by Gender Question

    I am doing a study on baccalaureate preferences by gender and I have questions about estimating a particular institution's expected male/female...

    Started by Onhech2‎, 09-27-2014 02:12 PM
    • Replies: 0
    • Views: 1,608
    09-27-2014, 02:12 PM Go to last post
  27. Please Help HW.

    A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

    Started by joshbb‎, 09-25-2014 04:19 PM
    • Replies: 2
    • Views: 4,397
    09-26-2014, 04:20 AM Go to last post
  28. Expected Value & Variance from Z = min (X,Y)

    Dear all, I have an assignment, but I don't understand yet which formulas I have to use to solve it. Here is the question: There is an...

    Started by statjunior‎, 09-24-2014 12:58 AM
    • Replies: 1
    • Views: 5,165
    09-24-2014, 03:48 AM Go to last post
  29. Need help with geometric pmf

    Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

    Started by Dichotomous‎, 09-22-2014 11:34 AM
    • Replies: 2
    • Views: 2,928
    09-22-2014, 01:26 PM Go to last post
  30. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

    i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

    Started by spunky‎, 09-21-2014 04:53 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,793
    09-21-2014, 08:59 PM Go to last post
  31. Comparing proportions

    Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

    Started by blue11‎, 09-21-2014 01:35 PM
    • Replies: 0
    • Views: 1,114
    09-21-2014, 01:35 PM Go to last post
  32. Homework help with conditional probability distribution

    Hi, I was wondering if I could get some help with this homework problem. We are given that X~U(0,1) and conditional distribution of Y|X=x is...

    Started by econnerd‎, 09-16-2014 05:55 PM
    • Replies: 1
    • Views: 1,898
    09-17-2014, 12:54 AM Go to last post
  33. Astronomer's estimate

    I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

    Started by debaprosad‎, 09-15-2014 11:46 AM
    • Replies: 3
    • Views: 2,776
    09-16-2014, 03:59 PM Go to last post
  34. Tricky probability problem

    Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a...

    Started by Probprob‎, 09-15-2014 10:19 AM
    difficult, probability
    • Replies: 1
    • Views: 1,069
    09-16-2014, 05:24 AM Go to last post
  35. Brain Teaser

    It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

    Started by ArtK‎, 09-06-2014 08:47 AM
    • Replies: 11
    • Views: 3,340
    09-08-2014, 11:43 PM Go to last post
  36. Probability of Unconventional Food Item Alleviating Medical Problem Multiple Times

    For about 2 years, a medical problem has more or less repeated, as follows: The problem normally lasts approximately 3 weeks and then goes away...

    Started by old geezer‎, 09-08-2014 02:50 PM
    correlation, improvement, medical problem, treatment
    • Replies: 0
    • Views: 1,089
    09-08-2014, 02:50 PM Go to last post
  37. Mathematical intuition for variance

    One explanation to "Why do we square the deviations" is.. "The sum of the square deviations of any set of observations from their mean is the...

    Started by jmlc‎, 09-08-2014 10:41 AM
    variance
    • Replies: 1
    • Views: 1,306
    09-08-2014, 10:59 AM Go to last post
  38. Help with son's probability question

    Hi Folks, I'm new here. Haven't studied probability in 30 years and trying to help my son with his homework. In the attachments is the question,...

    Started by mackbri‎, 09-04-2014 04:07 PM
    • Replies: 3
    • Views: 2,115
    09-06-2014, 03:39 AM Go to last post
  39. if z-value is a negative number, how can i calculate the Probability?

    Hello guys, :) I have an important question I want to ask. I have already searched the web and my statistics book but I can not find the answer :(...

    Started by katte‎, 09-04-2014 03:42 PM
    normal distribution, probability, z score, z value, z-value
    • Replies: 2
    • Views: 3,663
    09-04-2014, 10:14 PM Go to last post
  40. My article on runs testing random bit sequences

    The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

    Started by ArtK‎, 09-04-2014 05:12 AM
    • Replies: 0
    • Views: 1,327
    09-04-2014, 05:12 AM Go to last post
  41. probability poisson distributed

    hi can somebody help me with this question please.

    Started by arkeed178‎, 08-29-2014 06:52 AM
    • Replies: 5
    • Views: 2,283
    09-01-2014, 10:25 AM Go to last post
  42. Non central Chi square distribution and approximations Matlab

    Hello! I have a problem with the computation of a chi squared distribution in Matlab. I have a quadratic form : y' Px y, this form has a non...

    Started by bidou8601‎, 08-29-2014 08:39 AM
    • Replies: 3
    • Views: 3,820
    08-29-2014, 04:17 PM Go to last post
  43. Traffic light probability question.Need help!!

    Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

    Started by Shashank Prasad‎, 06-27-2014 04:22 PM
    • Replies: 2
    • Views: 6,955
    08-29-2014, 11:10 AM Go to last post
  44. Computing probability

    fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

    Started by studentbelg‎, 08-28-2014 11:47 AM
    • Replies: 1
    • Views: 1,432
    08-29-2014, 03:47 AM Go to last post
  45. Drawing variates from this density function

    Hi, I have derived the following probability density function, which I would like to draw random variates from as part of a Gibbs sampling step: ...

    Started by graeme‎, 08-21-2014 03:41 PM
    • Replies: 2
    • Views: 1,516
    08-28-2014, 07:01 PM Go to last post
  46. Poisson proces and binomial

    I'm trying to find the distribution of the number Y of arrivals in the timeinterval \subset where X(t) is number of arrivals in a poissonproces...

    Started by JesperHP‎, 08-28-2014 09:05 AM
    • Replies: 2
    • Views: 1,398
    08-28-2014, 10:15 AM Go to last post
  47. changing the frequency distribution with out the changing the shape of the disti

    i have frequency table of wind speeds from a measurement site and now i want to use that wind speed frequency table to find out wind speed at a...

    Started by codenamenikky‎, 08-15-2014 01:24 PM
    • Replies: 5
    • Views: 2,277
    08-25-2014, 05:28 PM Go to last post
  48. second order stochastic dominance for convex functions

    Hi, To gain better understanding of second-order stochastic dominance I am trying to replicate some basic proofs. The proof of `standard' SSD...

    Started by Arnoud‎, 08-22-2014 04:59 AM
    • Replies: 1
    • Views: 2,189
    08-22-2014, 12:25 PM Go to last post
  49. Question Probability that Bernoulli p-parameter is greater than some value, given N samples?

    Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

    Started by hansel‎, 08-11-2014 05:18 PM
    bernoulli, confidence intervals, parameter estimation
    • Replies: 5
    • Views: 2,506
    08-14-2014, 01:52 PM Go to last post
  50. Multi-level Bayes

    I guess that this is a multi level Bayes problem but there maybe a better technical name for it that I am not aware. Three jars contain tokens of...

    Started by TedR‎, 08-13-2014 11:50 AM
    bayes
    • Replies: 2
    • Views: 1,491
    08-13-2014, 12:35 PM Go to last post
  51. Question exponential and deterministic random variable mix

    Assume that there is a Poisson random process which has a rate of λ that produce samples which has an exponentially distributed inter-arrival times,...

    Started by PrasadP‎, 08-12-2014 07:42 PM
    • Replies: 3
    • Views: 991
    08-13-2014, 07:28 AM Go to last post
  52. Set Completion Problem for a Set of Collectable Objects

    I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

    Started by Eyks‎, 08-09-2014 01:47 AM
    • Replies: 8
    • Views: 2,927
    08-10-2014, 05:09 AM Go to last post
  53. Given an Average for Drawing 6 Times, What Are the Odds When Drawing Once?

    Suppose we draw 6 times, with replacement, from a deck of cards with four suits. We do not know how many cards of each suit there are, nor how many...

    Started by Eyks‎, 08-09-2014 06:29 PM
    • Replies: 1
    • Views: 989
    08-10-2014, 04:47 AM Go to last post
  54. Statistically different tops for 2 parabolas with non-normal distributed data

    For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

    Started by rob1‎, 07-30-2014 05:32 PM
    • Replies: 8
    • Views: 1,646
    08-08-2014, 11:20 AM Go to last post
  55. a question about discrete RV

    hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

    Started by avsha43‎, 08-07-2014 03:56 PM
    • Replies: 11
    • Views: 1,754
    08-08-2014, 07:38 AM Go to last post
  56. Drawing tokens from a bag - probability of getting 2(a) out of 3 draws

    EDIT: Please see my last post for my latest revelation/question regarding this problem! Hi all, first time poster here... I'm creating a...

    Started by bgm1961‎, 08-06-2014 11:43 AM
    bag, drawing, outcomes
    • Replies: 3
    • Views: 2,763
    08-07-2014, 12:08 PM Go to last post
  57. Ploting Positions from Peak Over Thresold Series

    Hello. I have a little confusing with some aspect related to the Peak Over Thresold Series and differencing the methodology of analysis from that...

    Started by Jpalbae‎, 08-06-2014 10:54 AM
    ploting positions, pot-series, probability
    • Replies: 0
    • Views: 1,178
    08-06-2014, 10:54 AM Go to last post
  58. Building confidence intervals using Coefficient of variation

    Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

    Started by jfca283‎, 08-05-2014 10:59 AM
    • Replies: 7
    • Views: 2,033
    08-05-2014, 12:51 PM Go to last post
  59. Probability Math Homework

    If someone could please help. I got the first part of question correct, but cannot figure out how to calculate the second part of the question. ...

    Started by emily8319‎, 07-31-2014 02:03 PM
    • Replies: 2
    • Views: 1,866
    08-01-2014, 10:47 AM Go to last post
  60. Interpretation histogram - normal versus logged variable

    For the histogram of my variable 'ambidexterity,' I predicted the data to have something like two normal distributions for this variable, one at the...

    Started by rob1‎, 07-31-2014 11:25 AM
    • Replies: 1
    • Views: 951
    07-31-2014, 11:49 AM Go to last post

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