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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: 30,183
    09-30-2005, 09:44 AM Go to last post
  1. Birthday problem using Bernoulli trails

    I came up with this problem: What is the approximate probability that no two people in a group of seven have the same birthday? So, I set up...

    Started by vxs8122‎, 09-02-2013 02:54 PM
    • Replies: 5
    • Views: 2,867
    09-02-2013, 03:36 PM Go to last post
  2. Births

    Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of an other...

    Started by carebear70417‎, 10-09-2005 09:08 PM
    • Replies: 1
    • Views: 15,705
    10-09-2005, 09:22 PM Go to last post
  3. Bivariate normal

    Hi, Need some help getting started with an assignment question. We have to independant distributed random variables, X~N(10,3) and Y~N(15,24)....

    Started by nils‎, 02-14-2009 10:01 AM
    • Replies: 2
    • Views: 2,873
    02-14-2009, 12:07 PM Go to last post
  4. Bivariate Normal + Max Transformation

    Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

    Started by caiohm‎, 02-01-2011 03:10 PM
    • Replies: 3
    • Views: 4,018
    02-02-2011, 05:25 PM Go to last post
  5. Bivariate Normal distribution

    I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

    Started by Emy‎, 06-26-2010 03:52 AM
    • Replies: 7
    • Views: 4,666
    06-26-2010, 02:28 PM Go to last post
  6. Bivariate Normal distribution

    I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

    Started by Emy‎, 06-26-2010 04:09 AM
    • Replies: 0
    • Views: 2,466
    06-26-2010, 04:09 AM Go to last post
  7. Bivariate Normal Distribution

    I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

    Started by mahu‎, 05-02-2012 02:51 AM
    bivariate normal
    • Replies: 1
    • Views: 5,063
    05-02-2012, 03:12 AM Go to last post
  8. Bivariate Normal problem

    PSAT scores: mean = 1200, SD = 100 (Let Random Variable = X) SAT scores: mean = 1300, SD = 90 (Let Random Variable = Y) Correlation p = .6 ...

    Started by StatStudent3‎, 12-06-2010 10:32 AM
    • Replies: 0
    • Views: 2,900
    12-06-2010, 10:32 AM Go to last post
  9. Bivariate random variable problem

    Hello I am trying to solve this problem: A coin is given with probability 1/3 for head (H) and 2/3 for tail (T). The coin is being drawn N...

    Started by Yankel‎, 12-30-2013 02:18 AM
    • Replies: 1
    • Views: 2,271
    12-30-2013, 07:16 AM Go to last post
  10. Bivariate transformation?

    Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

    Started by Talik‎, 01-11-2016 06:53 PM
    • Replies: 9
    • Views: 1,717
    01-11-2016, 08:37 PM Go to last post
  11. bizarre distributions

    Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

    Started by ArtK‎, 10-28-2014 08:59 AM
    • Replies: 0
    • Views: 1,255
    10-28-2014, 08:59 AM Go to last post
  12. Black Jack Anyone?

    Using the hypergeometric probability function below: P(x) = (r/x)((N-r)/(n-x))/(N/n) P(x) = probability of x success in n trials n = number of...

    Started by Parillamaster‎, 02-13-2006 11:29 AM
    • Replies: 3
    • Views: 5,870
    02-13-2006, 03:02 PM Go to last post
  13. Question Black Swans, non-normal distributions

    I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

    Started by jcelko‎, 10-19-2014 04:42 PM
    black swan, exponential growth, gaussian
    • Replies: 2
    • Views: 1,350
    10-22-2014, 08:11 PM Go to last post
  14. Blood Groups - I think this is right?

    46% of people have blood type O, 42% have type A, 9% have type B and 3% have AB. Among 4 potential donors, what is the probability that: A) all are...

    Started by kelly g‎, 01-28-2012 01:03 AM
    • Replies: 4
    • Views: 1,685
    01-28-2012, 03:37 AM Go to last post
  15. Book for stochastic processes

    I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

    Started by askazy‎, 07-07-2015 05:58 PM
    • Replies: 4
    • Views: 1,550
    07-22-2015, 01:23 PM Go to last post
  16. Book recommendations for distributions?

    Hi everyone, I'm relatively new to stats (have done two beginner courses on it), and I feel like I learn best when I have an engaging book by my...

    Started by curious_notes‎, 06-17-2015 05:13 PM
    • Replies: 2
    • Views: 1,316
    06-17-2015, 10:15 PM Go to last post
  17. Book's formula for run probability-- correct or not?

    Hi, group, Semi-retiree here with newfound interest in probability, slowly working my way through the problems in Wm Feller's excellent book....

    Started by X-man‎, 11-09-2013 06:09 PM
    • Replies: 3
    • Views: 2,153
    11-20-2013, 06:48 PM Go to last post
  18. bootstrap theory reference?

    I am curious about bootstrap methods, and just read the very elementary explanation of them here:...

    Started by Eugenie‎, 08-19-2012 05:24 AM
    • Replies: 2
    • Views: 1,560
    08-23-2012, 08:02 PM Go to last post
  19. Bound on the difference of two normal cds

    Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

    Started by amsb‎, 07-31-2010 03:09 PM
    • Replies: 2
    • Views: 2,837
    08-01-2010, 04:30 PM Go to last post
  20. Bounded in Probability

    Hello everyone, I am interested in the following problem: Let the sequence of random variables Xt, t=1,2,...n be bounded in probability, in...

    Started by VanessaSpotifyOne‎, 03-25-2013 04:30 PM
    • Replies: 1
    • Views: 3,728
    03-26-2013, 03:24 AM Go to last post
  21. Bounded in Probability proof

    Hi all, I could use some help understanding the following proof so please feel free to pitch in! Consider any random variable X with...

    Started by JohnK‎, 10-01-2013 06:51 PM
    • Replies: 5
    • Views: 4,615
    10-02-2013, 11:32 AM Go to last post
  22. Bounds on the probability

    Hey I have a problem. There are three contenders (!,B and C) for a resource. The probability that any one wins would naturally be 1/3. But...

    Started by sibtain125‎, 03-12-2012 08:59 AM
    • Replies: 0
    • Views: 1,066
    03-12-2012, 08:59 AM Go to last post
  23. 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: 2,366
    12-02-2011, 03:46 PM Go to last post
  24. Bowling - determining the probability of beating the other guy...

    Let's say bowler A and bowler B are going to face off in one match (string) in a single-elimination tournament. The higher score moves on. Over...

    Started by pfisch77‎, 12-17-2009 10:49 PM
    • Replies: 2
    • Views: 3,573
    12-26-2009, 02:34 PM Go to last post
  25. Box Plots

    I have got some box plots of my data and need to interpret them .I sort of understand what they mean and what it represents but am unsure of how to...

    Started by maddyhamiltonuk‎, 06-05-2006 12:07 PM
    • Replies: 1
    • Views: 3,303
    06-26-2006, 03:21 PM Go to last post
  26. Box with balls that change colors

    Hello ! I'm stuck with this problem Suppose that I have a box that contains n balls, where i are white, the others (n-i) are black. if I get a...

    Started by Nodame‎, 07-29-2013 08:33 PM
    • Replies: 1
    • Views: 1,874
    07-30-2013, 12:55 AM Go to last post
  27. 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: 3,237
    09-08-2014, 11:43 PM Go to last post
  28. Branching Process

    I attach the following question about branching processes. Any hints/help on how to proceed with my proof would be greatly appreciated! Regards

    Started by Darktranquillity‎, 03-26-2012 07:03 AM
    • Replies: 0
    • Views: 1,388
    03-26-2012, 07:03 AM Go to last post
  29. Branching process question

    Hi I have attached my question, I needed help on part ii). I don't know how compute P(N=n) Thanks

    Started by cjones‎, 05-17-2012 09:34 AM
    • Replies: 1
    • Views: 2,005
    05-18-2012, 12:52 AM Go to last post
  30. Breakeven exit strategy

    Hi, I have a gambling problem (admitting it is half the battle, right?), that I hope someone can help me with. Suppose that I know from historical...

    Started by redart‎, 07-18-2007 01:22 AM
    • Replies: 0
    • Views: 2,521
    07-18-2007, 01:22 AM Go to last post
  31. brownian motion in stopping time

    Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

    Started by Marina‎, 07-13-2011 07:08 AM
    • Replies: 6
    • Views: 3,698
    07-15-2011, 12:41 PM Go to last post
  32. Buffon's Needle Experiment

    This problem is quite interesting: A fine needle of length l is dropped at random on a board covered with parallel lines distance d apart where...

    Started by quark‎, 10-04-2005 02:08 PM
    • Replies: 0
    • Views: 8,520
    10-04-2005, 02:08 PM Go to last post
  33. 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: 1,668
    04-26-2011, 12:17 PM Go to last post
  34. Building a Multivariate Exponential Distribution...

    hey everyone! so when i asked about the Multivariate Poisson i was pointed in the right direction and was able to come up with a much decent answer...

    Started by spunky‎, 03-19-2012 05:40 PM
    • Replies: 2
    • Views: 4,198
    03-19-2012, 06:44 PM Go to last post
  35. Building a Multivariate Poission Distribution....

    hello peeps. i know i haven't posted in like ages but i've been very, very VERY busy lately so i hope i get more time once the semester ends. ...

    Started by spunky‎, 03-16-2012 11:26 AM
    • Replies: 5
    • Views: 3,058
    03-16-2012, 01:03 PM Go to last post
  36. 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: 1,953
    08-05-2014, 12:51 PM Go to last post
  37. Bunch of questions (just need help not answers)

    Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

    Started by pensfan10‎, 10-16-2008 02:07 PM
    • Replies: 9
    • Views: 4,901
    10-23-2008, 10:01 AM Go to last post
  38. Bus Paradox

    Please tell me how to solve this question correctly (Q) Buses arrive at a specified stop at 15-minutes intervals starting at 7 a.m. That is, they...

    Started by MTE-11‎, 10-27-2011 04:55 AM
    • Replies: 1
    • Views: 3,459
    10-28-2011, 03:18 PM Go to last post
  39. Business Predictability Scheduling Dilemma

    Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

    Started by jprice33‎, 06-08-2016 09:57 AM
    • Replies: 0
    • Views: 1,270
    06-08-2016, 09:57 AM Go to last post
  40. Exclamation Business Stats question...desperate for help

    My professor has assigned this problem and I have no idea what else to try. I have tried binomial distributions and poisson. It is in a chapter on...

    Started by rmevans1‎, 02-16-2009 09:19 PM
    • Replies: 1
    • Views: 7,866
    02-16-2009, 09:44 PM Go to last post
  41. Calculate a probability

    There are 2n ball in the box, n black and n white. Now get 2 from the box(we call it one pair), then get another 2, ... continue until there is no...

    Started by pepsico007‎, 02-06-2013 10:05 AM
    • Replies: 2
    • Views: 1,154
    02-06-2013, 12:58 PM Go to last post
  42. calculate intersection sets of cell clones in samples?

    Is it possible to calculate the probability of intersection sets in this setting? I have 44000 different cell clones in sample O, I donīt know how...

    Started by Rike133‎, 07-27-2017 06:58 AM
    • Replies: 0
    • Views: 367
    07-27-2017, 06:58 AM Go to last post
  43. Calculate Prob's using multiple means and std dev's

    Hi all. My first post. I'm trying to find a correct methodology for a problem and am a bit stumped as I don't really know how to frame it in a...

    Started by Wenona‎, 02-14-2012 05:57 AM
    • Replies: 4
    • Views: 2,550
    02-15-2012, 09:03 AM Go to last post
  44. Calculate probability

    an urn contains 5 red and 3 blue chips. suppose that 4 of these chips are selected at random and transferred to a 2nd urn, which was empty. if a...

    Started by gambit‎, 10-28-2012 10:25 AM
    • Replies: 0
    • Views: 1,226
    10-28-2012, 10:25 AM Go to last post
  45. Calculate probability in a concentrated group?

    If a given group of patients, each suffering from a condition that makes them 14 times more likely than the general populace to commit one act of...

    Started by Foreseen‎, 07-11-2012 10:35 AM
    • Replies: 1
    • Views: 1,317
    07-11-2012, 03:10 PM Go to last post
  46. Calculate Probability of a value greater than knowing the Mean, St Deviation...?

    I need to Calculate the probability of get 20000 or more with the following statistics; Statistics: Forecast values Trials 5,000 Base...

    Started by eduardo081092‎, 03-27-2013 01:49 AM
    confidence, deviation, interval, probabilities, probability
    • Replies: 1
    • Views: 2,288
    03-27-2013, 02:58 AM Go to last post
  47. Calculate Probabilty of event

    Hi !!! I have a prooblem and it seems the solution is simple but I need somebody else opinion. I have k groups of numbers from 1 to n . ...

    Started by snassimr‎, 08-11-2009 12:04 PM
    • Replies: 0
    • Views: 1,576
    08-11-2009, 12:04 PM Go to last post
  48. Calculate the Expected value,Variance,density and 2nd moment

    I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

    Started by alfred_oh‎, 05-03-2013 07:13 AM
    • Replies: 3
    • Views: 1,551
    05-04-2013, 08:04 AM Go to last post
  49. Calculate the moment generating function

    Hello, I can not calculate the generating function of X / Y = y . E (e ^ (-t X / Y = y)). (see attached file) Thanks so much.

    Started by Alex2015‎, 08-03-2015 08:10 AM
    • Replies: 0
    • Views: 903
    08-03-2015, 08:10 AM Go to last post
  50. calculate the probability of accident.

    Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

    Started by sanjeev kumar‎, 12-24-2011 01:24 PM
    • Replies: 6
    • Views: 5,629
    12-25-2011, 06:15 PM Go to last post
  51. Calculate the probability of collisions in an RF system?

    Dear Sirs, I have a question in probability which i hope you can help me with: In a building there are N number of transmitters. Each such...

    Started by dvash‎, 11-04-2010 11:03 PM
    • Replies: 2
    • Views: 3,881
    11-05-2010, 08:34 AM Go to last post
  52. calculating $E(Y)$

    suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

    Started by hadiSanji‎, 05-31-2016 01:11 PM
    probability
    • Replies: 1
    • Views: 1,061
    05-31-2016, 01:56 PM Go to last post
  53. Calculating "p-value"

    Hello, I'm brand new to this site...and trying to figure out (I know this is probably very elementary to all of you) "What is the value that appears...

    Started by rick‎, 07-29-2006 10:51 AM
    • Replies: 0
    • Views: 2,718
    07-29-2006, 10:51 AM Go to last post
  54. Calculating a new probability based on a scenario

    I have a number of assets, that I own a portion of, attached. Each asset has an individual annual probability of loss. However, the whole group is...

    Started by prr‎, 12-10-2009 07:35 AM
    • Replies: 0
    • Views: 2,406
    12-10-2009, 07:35 AM Go to last post
  55. Question Calculating a posteriori probability for a three-urn problem

    Hi, I am a psychology experimenter and I am having some deep trouble with a bayiasian probabillity calculation. I hope someone may help me. Thank...

    Started by jpluedtke‎, 05-25-2011 03:28 AM
    • Replies: 3
    • Views: 2,743
    05-26-2011, 08:10 AM Go to last post
  56. Calculating a stochastic matrix with multiple states

    I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

    Started by Codetemplar‎, 07-12-2015 07:42 AM
    • Replies: 1
    • Views: 1,163
    07-14-2015, 11:02 AM Go to last post
  57. Calculating a value given probability and type of random variable

    Hello, "Let \overline{X} be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine a, such that...

    Started by S-C-3-1-3‎, 01-27-2013 01:35 AM
    • Replies: 1
    • Views: 1,012
    01-27-2013, 03:31 AM Go to last post
  58. calculating expectation and variance

    Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

    Started by Andiem‎, 02-01-2009 02:00 PM
    • Replies: 4
    • Views: 5,104
    02-01-2009, 02:17 PM Go to last post
  59. 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 08:52 PM
    • Replies: 3
    • Views: 1,004
    03-05-2014, 07:48 AM Go to last post
  60. Calculating Expected Value of a Continuous Random Variable

    Hell all, I have this distribution function of a random variable X. I wish to find E(X). I have used derivatives to get the density...

    Started by Yankel‎, 06-10-2016 06:41 AM
    • Replies: 1
    • Views: 3,141
    06-10-2016, 10:58 AM Go to last post

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