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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: 30,307
    09-30-2005, 09:44 AM Go to last post
  1. Probability conundrum

    This little problem has got at me so much I've registered on this site just to see if there is a solution! Maybe someone can help This is the...

    Started by donpost‎, 01-23-2013 03:54 PM
    • Replies: 1
    • Views: 1,446
    01-24-2013, 11:47 PM Go to last post
  2. Combination question

    Hey, kind of stumped on this and hopefully someone can point me in the right direction. A company is looking at events over N years. A person can...

    Started by wizuriel‎, 01-24-2013 12:40 PM
    • Replies: 1
    • Views: 1,696
    01-24-2013, 01:06 PM Go to last post
  3. Probability: mean is known

    I have a question which is probably something really simple and easy but for some reason I just can't figure it out. For a small regional airline,...

    Started by Kev007‎, 01-23-2013 07:45 AM
    • Replies: 2
    • Views: 896
    01-23-2013, 06:19 PM Go to last post
  4. Real Life Problem - Help Me Out

    It's been years since I've taken stats and I am starting to think I forgot it all. Please, help me out if you can. Here's my problem. I was using...

    Started by TotalNovice‎, 01-23-2013 03:13 AM
    • Replies: 4
    • Views: 1,321
    01-23-2013, 10:13 AM Go to last post
  5. Binomial probability with another aspect?

    Assume that the orange widgets are produced independently of each other with the probability of an individual orange widget being good being equal to...

    Started by MATRL‎, 01-21-2013 04:09 PM
    binomial
    • Replies: 4
    • Views: 1,153
    01-22-2013, 05:47 PM Go to last post
  6. Moments for a parameter uncertainty where the moment itself is a function

    I have a 2d continuous and differentiable function f(x,y), now i want to look at parameter uncertainty for this function; y now is replaced by a...

    Started by springwater366‎, 01-21-2013 07:32 AM
    • Replies: 2
    • Views: 1,467
    01-22-2013, 07:22 AM Go to last post
  7. Bartels: Cycles test of signifcance

    I have this pdf doc that explains the formula of Bartels , the test of a cycle significance on a time series. I am trying to put it into excel .....

    Started by icm63‎, 08-21-2010 08:02 PM
    • Replies: 1
    • Views: 4,439
    01-22-2013, 04:03 AM Go to last post
  8. Probability question with exponential random variable

    Hello, I need some help with this: In a bank, the time that a clerk is giving to a customer is an exponential random variable with mean of 5...

    Started by Yankel‎, 01-21-2013 05:28 AM
    • Replies: 3
    • Views: 1,550
    01-21-2013, 09:40 AM Go to last post
  9. Problem with approximating Binomial Distribution

    Hi, I am approximating a Binomial(2600,\frac{1}{10000})random variable using a Poisson random variable and a Normal random variable. The...

    Started by Slime‎, 01-20-2013 01:50 AM
    • Replies: 4
    • Views: 2,757
    01-20-2013, 10:50 PM Go to last post
  10. Probability of machine failure question

    Hi, While I'm an engineer, and have training in stats and probability, those aren't exactly my strong points, so I thought I'd ask you folks --...

    Started by alan speakman‎, 01-19-2013 12:24 PM
    • Replies: 7
    • Views: 4,006
    01-20-2013, 02:43 AM Go to last post
  11. What is the probability of getting 6 uniques in 10 tries?

    Each of these balls contain 1 figure. There is a total of 6 different figures to collect. There is an equal chance to get any of those 6 figures when...

    Started by MathIsOhSoHard‎, 01-18-2013 11:19 PM
    • Replies: 6
    • Views: 1,620
    01-19-2013, 02:50 PM Go to last post
  12. stuck on a problem. please help me solve it

    hi, am studying for a probability exam and i am stuck on this problem:A random variable X is defined as the square of the outcome of a standard die...

    Started by eli7‎, 01-19-2013 09:59 AM
    • Replies: 2
    • Views: 1,597
    01-19-2013, 10:02 AM Go to last post
  13. moment generating functions

    Stuck on homework question: I need to show the m.g.f. of an exponential distribution is: M_x(t)=\frac{\beta}{\beta-t} for t<\beta First i...

    Started by Prometheus‎, 01-12-2013 10:16 AM
    • Replies: 8
    • Views: 2,002
    01-19-2013, 07:39 AM Go to last post
  14. Create Probability Table!

    I need help with this question, I can't figure it out for the life of me! I mostly need help setting it up in a table! PLEASE EXPLAIN YOUR PROCESS...

    Started by Kennedy‎, 01-17-2013 05:40 PM
    • Replies: 3
    • Views: 1,246
    01-17-2013, 06:07 PM Go to last post
  15. An interesting probability calculation problem

    Hello all! I'll be really glad if you respond to this question. I am working with an interesting probability calculation problem. In my problem...

    Started by Blain Waan‎, 01-17-2013 01:51 PM
    • Replies: 2
    • Views: 1,462
    01-17-2013, 02:20 PM Go to last post
  16. Ratio of two independent gamma random variables

    Hello, I am working on a problem in which I need to find the expectation of the square root of the ratio of two independent gamma random variables...

    Started by GTaiko‎, 01-16-2013 10:40 PM
    • Replies: 5
    • Views: 6,381
    01-17-2013, 10:44 AM Go to last post
  17. Prove or Dispprove Independence Statement

    Hey, "If A is independent of B and B is independent of C, then A is independent of C. Prove this statement or give a counterexample if it is...

    Started by Slime‎, 01-16-2013 07:14 PM
    • Replies: 1
    • Views: 7,502
    01-16-2013, 07:35 PM Go to last post
  18. Balls in buckets ...

    Suppose there are T buckets in a room. Suppose further that there are two individuals, 1 and 2, who each have B1 and B2 tennis balls, where B1...

    Started by BigBugBuzz‎, 01-16-2013 05:32 AM
    combinatorics
    • Replies: 4
    • Views: 1,615
    01-16-2013, 09:14 AM Go to last post
  19. Desperate to understand....

    Desperate to understand how to calculate p value for my research on object line degradation, I have tried SPSS, etc, but am getting more and more...

    Started by mcsk‎, 01-15-2013 05:18 AM
    • Replies: 3
    • Views: 2,074
    01-16-2013, 01:05 AM Go to last post
  20. Post Determine how the event size and sample size get affected and how to find them

    I came across with various types of probability problems. Here I want your expert advice, regarding effect on event size and sample size. And how...

    Started by sachinner‎, 01-15-2013 12:56 PM
    • Replies: 0
    • Views: 1,203
    01-15-2013, 12:56 PM Go to last post
  21. Why is this question not Binomial?

    Hi, "A fair coin is tossed three times. What is the probability of two or more heads, given that there was at least one head?" Why is this not...

    Started by S-C-3-1-3‎, 01-15-2013 10:47 AM
    • Replies: 1
    • Views: 1,034
    01-15-2013, 12:29 PM Go to last post
  22. Classical Probability and Relative Frequency Probability Approach

    As classical Probability uses mathematical formula for calculation and events are equally likely. As I know Binomial distribution is used for...

    Started by sachinner‎, 01-15-2013 10:11 AM
    • Replies: 0
    • Views: 5,352
    01-15-2013, 10:11 AM Go to last post
  23. Post Probability Problems and Venn Diagram- What is actually to be found out

    I come accross with different words in Probability problems. Please explain with venn diagram considering A & B as two events 1)What is probability...

    Started by sachinner‎, 01-15-2013 10:06 AM
    • Replies: 0
    • Views: 1,673
    01-15-2013, 10:06 AM Go to last post
  24. Post Dependent Event Vs Independent Event Vs Mutually Exclusive Events

    While reading probability book I come across with above terms. Following questions raised in my mind. 1)Are Dependent events always Mutually...

    Started by sachinner‎, 01-14-2013 12:51 PM
    • Replies: 3
    • Views: 25,646
    01-15-2013, 10:04 AM Go to last post
  25. Probability with dice

    I ran into a probability question recently, and I have been unable to gain any traction with solving it. Simply put, the question is this: ...

    Started by pobrien18‎, 01-14-2013 10:44 AM
    • Replies: 2
    • Views: 2,089
    01-15-2013, 04:42 AM Go to last post
  26. Exclamation Using Neyman-Fisher Factorization Theorem to show sufficiency of T

    Hey guys I have a homework problem that I keep getting stuck on. It reads as follows: Let X and Y be independent Poission variables with...

    Started by fizzhead‎, 01-14-2013 11:16 PM
    • Replies: 1
    • Views: 3,334
    01-15-2013, 04:26 AM Go to last post
  27. Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms.

    Wigan V City Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms. Please advise how to proceed with this question...

    Started by Poisson1‎, 01-10-2013 10:54 AM
    • Replies: 8
    • Views: 1,928
    01-14-2013, 06:46 PM Go to last post
  28. pdf of reciprocal of RV

    Random variable V, const x; Tau = x/V i want to factor out x to get pdf f_{1/V} from pdf f_{Tau} and also get the variance. Is following correct? ...

    Started by springwater366‎, 01-11-2013 09:23 AM
    • Replies: 2
    • Views: 1,777
    01-14-2013, 04:17 AM Go to last post
  29. Jointly WSS

    1. The problem statement, all variables and given/known data ϕ(t) = R(t) = autocorrelation ϕ(f) = S(f) = power spectral density Inputs v and w...

    Started by SeriousTyro‎, 01-14-2013 02:19 AM
    • Replies: 0
    • Views: 1,815
    01-14-2013, 02:19 AM Go to last post
  30. Pure Birth Process

    Hi guys, I'm having some trouble with this question: For part i), I have df_0/dt = -\lambda f_0 giving f_0=\exp(c_1-\lambda t) The...

    Started by ceejay2000‎, 01-13-2013 08:15 PM
    • Replies: 0
    • Views: 1,104
    01-13-2013, 08:15 PM Go to last post
  31. Baye's Formula Confusion!

    Hello, I think I have answered most of this question correctly, but do not quite understand how to find P(D^c|F^c) . The question is as...

    Started by Slime‎, 01-13-2013 12:15 AM
    • Replies: 3
    • Views: 4,809
    01-13-2013, 06:49 PM Go to last post
  32. I choose a 4 digit number abcd between 0000 and 9999 at random.

    I choose a 4 digit number abcd between 0000 and 9999 at random. What is the probability that? a) What is the probability that |a-d| = 2? b) What...

    Started by blisman‎, 01-11-2013 10:21 PM
    probabilty
    • Replies: 2
    • Views: 3,221
    01-11-2013, 10:58 PM Go to last post
  33. Basic probability question

    This is a probability question centered around some pseudo code, enjoy! n<-number of rows(x) max<-x for (i in 1 to n) do if x > max then...

    Started by murwebb‎, 01-05-2013 06:08 PM
    probability
    • Replies: 7
    • Views: 1,898
    01-07-2013, 03:16 PM Go to last post
  34. please i need help with this probleme

    hi,we got this mind breaking exercice from our probability teacher -.- note:it's question number 2 that's killing me a gate keeper have 12 keys and...

    Started by bomebome123‎, 12-29-2012 06:36 AM
    • Replies: 1
    • Views: 1,359
    01-02-2013, 01:36 PM Go to last post
  35. Possible outcome for an infinite number of rolls of a die

    Suppose the following: I have a die with 10 faces. 9 faces say 'lose' and 1 face says 'win'. I repeatedly roll the die forever (i.e. an infinite...

    Started by robbierich90‎, 12-30-2012 09:30 AM
    die, infinite, probability, ratio
    • Replies: 1
    • Views: 1,323
    12-30-2012, 02:19 PM Go to last post
  36. confidence interval

    Hi every one I have problem with this question . please help me if you can A research collected 17 observations of breakdown voltage with...

    Started by calamariss‎, 12-30-2012 03:50 AM
    • Replies: 2
    • Views: 1,674
    12-30-2012, 05:40 AM Go to last post
  37. Expectation/probability question (sorta like Craps, maybe?)

    I'll try to be as brief as possible: I have a number of events that can happen, say e1, e2...eN. N isn't particularly large. Each event has a...

    Started by montalbon‎, 12-27-2012 02:54 AM
    closed form, error rate, expectation, probability
    • Replies: 5
    • Views: 2,242
    12-28-2012, 03:05 AM Go to last post
  38. Lightbulb please find me the probability

    In USA 100 mayors. 50 democratic and 50 republican, 60 men and 40 women, have taken part in a conference on the environment. Among the men, 25 are...

    Started by Roseqad‎, 12-26-2012 04:14 PM
    probability question
    • Replies: 1
    • Views: 1,448
    12-26-2012, 04:45 PM Go to last post
  39. Complex question of combinatorial probability

    I would like to know if an equation exists or can be defined for computing the probability of drawing (at random from a population of elements) all...

    Started by Pwestcitt‎, 12-23-2012 04:17 AM
    • Replies: 5
    • Views: 1,615
    12-25-2012, 05:32 AM Go to last post
  40. Decisions: probabilities and preferences

    Hello everybody. I was wondering if anyone could help me with the following problem. I need to decide between three options: a) spend my holiday...

    Started by Alex_Bham‎, 12-24-2012 10:29 AM
    preferences, probabilities
    • Replies: 2
    • Views: 1,686
    12-24-2012, 06:27 PM Go to last post
  41. Challenging probability question

    Hello, I have this question, I need some help with it. In an urn there are 10 balls marked with the numbers 1-10. 4 balls are being chosen...

    Started by Yankel‎, 12-23-2012 04:11 PM
    • Replies: 4
    • Views: 2,617
    12-24-2012, 03:32 AM Go to last post
  42. can someone solve this ?!

    find values of a b and c

    Started by Ahmedelwakeel‎, 12-22-2012 05:31 PM
    • Replies: 2
    • Views: 1,757
    12-22-2012, 10:49 PM Go to last post
  43. Maximizing odds in a lottery raffle

    Thought users here may find this puzzle( http://bayesianthink.blogspot.com/2012/12/lottery-raffle-optimization-puzzle.html ) interesting

    Started by matrix_testing_ans‎, 12-19-2012 03:56 PM
    • Replies: 0
    • Views: 919
    12-19-2012, 03:56 PM Go to last post
  44. Question Spearman Correlation and Correlation of Attributes

    Hi All, Could anyone advise on this question? Will a Spearman Correlation provide a description of the Correlation of Attributes? I'm...

    Started by Charles‎, 12-17-2012 10:08 PM
    • Replies: 0
    • Views: 1,289
    12-17-2012, 10:08 PM Go to last post
  45. Marginal PDF of Y

    Let, X have pdf given by f(x)=12x^2+4x,if 0<x ,1/2,and f(x)= 0 otherwise Conditional on X = x, let Y be uniformly distributed on the interval...

    Started by llbeanme‎, 12-17-2012 01:19 PM
    • Replies: 2
    • Views: 1,472
    12-17-2012, 02:15 PM Go to last post
  46. Expectation of iid variables

    Hello I hope to get some help with this one. Let X_1,X_2 be iid random variables, both concentrated on I\subset\mathbb{R}_+. Define ...

    Started by cauchy‎, 12-16-2012 11:22 AM
    • Replies: 7
    • Views: 4,137
    12-17-2012, 12:18 PM Go to last post
  47. [Likelihood of embedded Markov chain] Likelihood of Goldman Yang (GY) rate matrix

    This question concerns defining the likelihood of a set of parameters in a rate matrix of an embedded Markov chain. To get a brief idea of the...

    Started by smib‎, 12-17-2012 11:52 AM
    biology, likelihood, markov chains
    • Replies: 0
    • Views: 1,443
    12-17-2012, 11:52 AM Go to last post
  48. Probability of serious injury on kickoffs

    I am trying to understand the statistics behind serious injuries on NFL kickoffs. Now letís ignore the particular issue and just look at these...

    Started by paulri‎, 12-14-2012 02:17 PM
    • Replies: 4
    • Views: 2,945
    12-17-2012, 11:25 AM Go to last post
  49. Can some one solve this as soon as possible ?!

    Started by Ahmedelwakeel‎, 12-15-2012 07:35 PM
    • Replies: 1
    • Views: 1,596
    12-15-2012, 07:41 PM Go to last post
  50. Probability Problem

    This isn't for homework this is for my personal curiosity. Here's the problem. You pick 5 colors at random from a bag with an infinite amount of...

    Started by Benny‎, 12-12-2012 10:20 PM
    • Replies: 3
    • Views: 2,378
    12-14-2012, 12:33 AM Go to last post
  51. joint VS marginal skewness for multivariate distributions...

    hello peeps! just a quick proof by popular vote here, in case anyone has any input on it: CLAIM: "it is possible for a multivariate...

    Started by spunky‎, 12-12-2012 02:50 PM
    • Replies: 4
    • Views: 2,292
    12-13-2012, 01:37 AM Go to last post
  52. combinations question

    At a recent faculty party there were 8 philosophers, 5 psychologists, and 6 physicists, all noted for their love of the (fermented) grape (and...

    Started by moe6142‎, 12-11-2012 10:17 PM
    • Replies: 1
    • Views: 1,423
    12-12-2012, 03:47 AM Go to last post
  53. help please!

    I have this question to do, but i dont know where to start or what to do at all! Suppose that birds of some type have each time a random number X...

    Started by stat101‎, 12-11-2012 02:38 AM
    • Replies: 2
    • Views: 1,377
    12-11-2012, 03:09 AM Go to last post
  54. Please help!! so confused!

    Hey Im preparing for my exam tommorow and solving examples and questions. I'm stuck on about 9 questions and i really need help!! can anyone please...

    Started by kaushik‎, 12-10-2012 01:24 AM
    • Replies: 1
    • Views: 1,351
    12-10-2012, 02:24 AM Go to last post
  55. probabilty/proportion question

    please delete this thread

    Started by moe6142‎, 12-09-2012 03:29 PM
    • Replies: 1
    • Views: 996
    12-09-2012, 03:31 PM Go to last post
  56. Poisson Probability Quesiton

    Problem # 4 in the image below: I've been unable to find an example similar to this and my instructor is out of town so his guidance is not...

    Started by parker12IMET‎, 12-08-2012 01:37 PM
    • Replies: 3
    • Views: 957
    12-09-2012, 05:06 AM Go to last post
  57. QQ plot confusion

    Hi all, I have been studying my text on QQ plots and it does an example with a bunch of data points. Sorts them from smallest to largest. Then...

    Started by Tjvelcro‎, 12-08-2012 09:22 PM
    • Replies: 1
    • Views: 1,085
    12-08-2012, 09:28 PM Go to last post
  58. area under curve normal distribution

    Two issues, that I am confused about after reading statistics books. Example: weight of an adult is normally distributed with mean of 180 lbs...

    Started by billmt‎, 12-08-2012 01:38 PM
    conditional expectation, normal distribution
    • Replies: 3
    • Views: 1,932
    12-08-2012, 04:35 PM Go to last post
  59. Extremely Simple Probability Calculation

    I am working on a project (non-school, non-homework, math for fun :D) in which I need to determine a fairly simple probability. I need to determine...

    Started by athingonetime‎, 12-08-2012 12:31 AM
    probability
    • Replies: 5
    • Views: 1,199
    12-08-2012, 04:22 PM Go to last post
  60. Is this a suitable way to summarize parameter distributions?

    Hello everyone, I have the following situation: I have a set of multiple environmental models with multiple parameters. I have now run these with...

    Started by BManz‎, 12-07-2012 01:34 PM
    coefficient of variation, parameter estimation
    • Replies: 0
    • Views: 976
    12-07-2012, 01:34 PM Go to last post

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