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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: 30,339
    09-30-2005, 09:44 AM Go to last post
  1. Probability question. Think its Multinomial.

    The Question is: Packets of a certain brand of shampoo should contain 1kg of shampoo powder. The filling machine for these packets is known to give...

    Started by Preovidence1234‎, 05-25-2010 08:43 PM
    • Replies: 1
    • Views: 1,978
    05-26-2010, 02:09 AM Go to last post
  2. Gamma/poisson distribution

    Suppose that ‘serious’ road accidents happen on a regional road in accordance with a Poisson process with a rate of 2.3 per week. Let T1 be the...

    Started by Cookie‎, 05-25-2010 07:17 AM
    • Replies: 1
    • Views: 6,272
    05-25-2010, 08:36 AM Go to last post
  3. Question Probability Density Function needed

    I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

    Started by pandre‎, 05-17-2010 09:58 PM
    • Replies: 3
    • Views: 2,910
    05-23-2010, 02:17 AM Go to last post
  4. Is this a standard distribution?

    Hello, Please pardon my LaTeX, but does anyone recognize this probability distribution? \frac{ (1-w)^{n_1} w^{n_2} }{ ...

    Started by Dan the Chemist‎, 05-20-2010 03:05 PM
    • Replies: 6
    • Views: 2,549
    05-22-2010, 04:26 AM Go to last post
  5. EM Algorithm question

    Dear friends: Please, see page 3 of this document. I don't undestand equation(1). I understand the index separation of sum {1,...,m} +...

    Started by wipeout‎, 05-19-2010 01:39 PM
    • Replies: 3
    • Views: 2,913
    05-20-2010, 07:34 AM Go to last post
  6. why should the I use a t distribution? (theory question)

    Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

    Started by gargy‎, 05-19-2010 05:44 AM
    • Replies: 5
    • Views: 7,346
    05-19-2010, 01:15 PM Go to last post
  7. Convergence problem in probability

    Hi, the following question keeps coming up in recent year's exam and i'm unsure how to do it fully: Q. If the sequence of random variables...

    Started by qwertykeyboards‎, 05-19-2010 05:44 AM
    • Replies: 1
    • Views: 4,261
    05-19-2010, 10:18 AM Go to last post
  8. How can I determine the accuracy of some predictions?

    How can I determine the accuracy of some predictions? Take the example of weather forecasts. Each day weather.com has a predicted probability it will...

    Started by TheAndruu‎, 05-17-2010 12:18 PM
    • Replies: 2
    • Views: 4,160
    05-18-2010, 11:47 AM Go to last post
  9. Good Probability Theory Text Book

    Hello, I am wondering if someone, preferably a graduate student, instructor, or professor, could recommend a good textbook about probability. ...

    Started by divinityofnumber‎, 05-17-2010 12:24 PM
    • Replies: 3
    • Views: 4,337
    05-17-2010, 06:43 PM Go to last post
  10. Probability Questions, Need to be completed ASAP, please help!!!

    A box contains six balls, labeled 1 through 6. What is the probability that if you draw out two of the balls, the sum of the numbers on the two is...

    Started by sreddy22‎, 05-14-2010 09:14 PM
    • Replies: 1
    • Views: 2,236
    05-14-2010, 09:21 PM Go to last post
  11. Sum of Weighted Probability Distributions

    If I sum independent random variables X + Y = Z, then the distribution f(z) will be given by the convolution of the probability distributions f(x)...

    Started by jensph‎, 05-13-2010 04:39 PM
    • Replies: 2
    • Views: 9,726
    05-14-2010, 10:38 AM Go to last post
  12. What data transformation should I apply to count data, which includes zero values?

    What data transformation should I apply to count data, which includes zero values and follows the negative binomial distribution, prior to the...

    Started by oscillate_wildly‎, 05-12-2010 06:28 PM
    • Replies: 1
    • Views: 5,155
    05-13-2010, 10:27 AM Go to last post
  13. Checking over answers

    hey could you guys tell me if i got these correct because there are some I'm unsure on the method thanks :wave: X-Exp(0.3) then find P(X>15|X>10)...

    Started by pure_zero‎, 05-11-2010 07:48 PM
    • Replies: 6
    • Views: 3,602
    05-13-2010, 04:15 AM Go to last post
  14. How to calculate the expected overlab between sets

    Hi! I wish to do the following: I have two vectors with N elements in each. All elements are set to zero. Now, in each vector I select n...

    Started by pmrdk‎, 05-11-2010 02:05 PM
    • Replies: 1
    • Views: 3,199
    05-11-2010, 02:45 PM Go to last post
  15. Lightbulb mann whitney test or Kolmogorov smirnov test?

    I'm working with non parametric methods to compare two samples and detect diferences between them. I used the mann-whitney test and obtained, for all...

    Started by Marga‎, 11-02-2006 06:46 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 27,112
    05-09-2010, 02:28 PM Go to last post
  16. help needed

    Hello, I have two questions. 1)Each year in my company employees (about 100 people) are evaluated. Scores are: 0.7, 1.0, 1.2 and 1.3....

    Started by jasio‎, 04-17-2010 10:54 AM
    • Replies: 2
    • Views: 2,793
    05-09-2010, 01:19 AM Go to last post
  17. Industry-Wide safety factor of 4

    I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

    Started by Outlier‎, 05-07-2010 02:54 PM
    • Replies: 6
    • Views: 5,266
    05-08-2010, 10:20 AM Go to last post
  18. Joint probability of random variables. Please help!!

    Three iid random variables, X, Y and Z with normally distribution with known mean and variances. If two pairs are made, X+Y and Y+Z then are they...

    Started by adnaniut‎, 03-11-2010 02:26 PM
    • Replies: 4
    • Views: 3,695
    05-08-2010, 03:41 AM Go to last post
  19. Help with Binomial Proportion Estimate

    Hello All, This problem has been giving me headaches! When a person walks into a supermarket they either use a cart (success) or don't use a...

    Started by BernoulliX‎, 05-06-2010 02:37 AM
    • Replies: 2
    • Views: 2,885
    05-06-2010, 05:22 PM Go to last post
  20. Simple probability question

    Test question: Assume that it is equally likely for a pregnancy to deliver a baby boy or a baby girl. Suppose that for a particular large...

    Started by jll6m‎, 05-05-2010 04:05 PM
    • Replies: 4
    • Views: 4,815
    05-06-2010, 12:25 PM Go to last post
  21. Intensity Matrix

    Hi, sorry to keep harassing everyone like this, but I'm stuck again. It's the same setup as the last question, but this time it's asking about the...

    Started by stats_noob‎, 05-05-2010 02:53 AM
    • Replies: 2
    • Views: 5,730
    05-06-2010, 06:14 AM Go to last post
  22. very short question bounded in prob

    Hi there, If X is a r.v. and E(X^2)<infinity , can I say that the r.v. X is bounded in probability? If yes why? Is there a theorem or...

    Started by leo nidas‎, 05-05-2010 03:54 PM
    • Replies: 3
    • Views: 2,755
    05-06-2010, 05:41 AM Go to last post
  23. Need help for Selecting Model

    Hi, I'am working in a project of a service company.Say they are providing 4 different service to customer.Now my task is to find the transition...

    Started by stata‎, 04-16-2010 09:16 AM
    • Replies: 1
    • Views: 2,061
    05-05-2010, 11:13 AM Go to last post
  24. Sojourn time of birth and death process

    Hello, I'm having trouble working out the sojourn times and the lecture notes are no help. So far all I know is that they are independently and...

    Started by stats_noob‎, 05-03-2010 07:22 AM
    • Replies: 2
    • Views: 4,886
    05-04-2010, 01:40 AM Go to last post
  25. Probability that a hypothesis is correct

    I posted this question on Y! Answers a while ago and no one answered it :) I thought I'd try my luck here instead. A scientist performs an...

    Started by BucketOfFish‎, 05-03-2010 12:32 PM
    • Replies: 1
    • Views: 2,574
    05-03-2010, 03:15 PM Go to last post
  26. How do I add percentages?

    For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

    Started by cpaavola‎, 04-30-2010 11:30 AM
    • Replies: 4
    • Views: 8,000
    05-03-2010, 11:15 AM Go to last post
  27. Probability of leading at quarter time

    Hi all, I'm interested in calculating the probability that a sporting team will be leading at quarter time if the probability of the team winning...

    Started by djwray‎, 05-03-2010 07:23 AM
    • Replies: 0
    • Views: 2,784
    05-03-2010, 07:23 AM Go to last post
  28. Examples of strictly stationary sequence?

    Hi. I come across this 'stationary' term quite frequent. I find 'stationary increment' in Poisson process. But, now, in extreme value theory, i find...

    Started by tsukiko‎, 05-03-2010 05:25 AM
    • Replies: 0
    • Views: 5,161
    05-03-2010, 05:25 AM Go to last post
  29. Urgent Help Please

    Hi people, Stasticians :) I'm new and a mom. I have been asked to help out with an assignment due tomorrow :O - she has been away overseas for...

    Started by ramasama‎, 05-02-2010 10:51 AM
    • Replies: 1
    • Views: 3,978
    05-02-2010, 11:14 PM Go to last post
  30. Probability Distributions

    Ive worked out how to do parts a,b and c but i dont understand why the graph for fx(x) at x=3 goes down from 4 to 3 then back to 4,why isnt it a...

    Started by Fabregas04‎, 05-02-2010 06:41 PM
    • Replies: 0
    • Views: 2,271
    05-02-2010, 06:41 PM Go to last post
  31. Probability that W(t) = 0 (Calculating inverse Gaussian double integral)

    I'm working on a problem that asks for the probability that a standard Brownian motion = 0 for some time t between t0 and t1, and I'm stuck on...

    Started by sweetpotatofry‎, 05-01-2010 01:34 PM
    • Replies: 1
    • Views: 2,916
    05-01-2010, 06:51 PM Go to last post
  32. Sum of Series?

    Hi, I was wondering how to prove Summation from k=0 to d of (d choose k) * (a/d)^k * (1 - a/d)^(d-k) * k = a To put this in context, it's...

    Started by sweetpotatofry‎, 04-27-2010 09:22 PM
    • Replies: 2
    • Views: 2,510
    05-01-2010, 01:22 PM Go to last post
  33. Poisson Process

    Hello I really need help with this problem and I have to show my work. We went over the Poisson equation but I can't figure out how to plug...

    Started by dalekissell‎, 04-27-2010 09:46 PM
    • Replies: 1
    • Views: 6,037
    04-28-2010, 12:49 AM Go to last post
  34. randomization for design of experiments help

    Hi! New here. Looks like a pretty awesome place! I have a question regarding the differences in randomization processes. I'm working on a small...

    Started by MrTTable‎, 04-25-2010 01:54 PM
    • Replies: 2
    • Views: 3,028
    04-27-2010, 06:23 PM Go to last post
  35. Help!!!

    Hello, I am taking a statistics class and have been able to do well up until now however I have reached a problem and the instructor is not...

    Started by SandyEggo‎, 04-26-2010 03:03 PM
    • Replies: 1
    • Views: 1,932
    04-27-2010, 01:35 PM Go to last post
  36. Hypergeometric dist

    Hi, got a little question regarding Hypergeometric distribution. We mix in an urn 15 coins. 5 coins of 1 pound, 5 coins of 50 pens and 5 coins...

    Started by WeeG‎, 04-27-2010 10:01 AM
    • Replies: 2
    • Views: 3,390
    04-27-2010, 01:03 PM Go to last post
  37. please verify that this is correct

    David goes to a drive test until he passes it. the chance of passing the test is 0.6. assume that the tests are independent. if we know that David...

    Started by WeeG‎, 04-27-2010 07:15 AM
    • Replies: 1
    • Views: 3,109
    04-27-2010, 11:07 AM Go to last post
  38. Logistic Distribution Question

    I have two independent random variables each with a logistic distribution (not necessarily same mean and variance). How is the difference (or sum)...

    Started by koochak‎, 04-23-2010 06:18 AM
    • Replies: 6
    • Views: 8,226
    04-27-2010, 07:22 AM Go to last post
  39. Shared risk / reward

    Ok. I'm not a math wiz, but a buddy and I had a debate regarding probability. Here's the scenario, let's say the probability of getting hit by a...

    Started by fwforester‎, 04-24-2010 09:38 PM
    • Replies: 1
    • Views: 3,976
    04-25-2010, 05:55 PM Go to last post
  40. A Darts Problem

    In a game of darts the person that throws first in a leg has an advantage. The players take it in turns to go first. So if we assume Player A has a...

    Started by SPritchard‎, 04-25-2010 03:47 AM
    • Replies: 3
    • Views: 3,126
    04-25-2010, 02:23 PM Go to last post
  41. Help Needed

    Textbook publishers must estimate the sales of new (first-edition) books. The records of one major publishing company indicate that 10% of all new...

    Started by tharril‎, 04-22-2010 07:30 AM
    • Replies: 1
    • Views: 4,845
    04-25-2010, 12:42 AM Go to last post
  42. finite variance

    Hi there, if X is a random variable and all we know is that it has finite variance. Can we say that X is bounded? If not what is the meaning of...

    Started by leo nidas‎, 04-24-2010 12:20 PM
    • Replies: 2
    • Views: 5,827
    04-25-2010, 12:36 AM Go to last post
  43. Removing an outlier DECREASES correlation??

    Here's my data. Note the "outlier" X LN(X) Y 4 1.386294361 0.107543212 6 1.791759469 3.289563593 7 1.945910149 2.058949066...

    Started by MrGibbage‎, 04-19-2010 01:38 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 37,314
    04-24-2010, 07:17 PM Go to last post
  44. Normal Distribution

    An individuals’ heights are normally distributed with mean 70 and standard deviation 3 (inches). a) What proportion of the population is...

    Started by SmileAli‎, 04-23-2010 05:16 PM
    • Replies: 4
    • Views: 10,988
    04-24-2010, 01:34 AM Go to last post
  45. True / False ?

    P(A/B)=P(B)-P(Ac/B) where Ac is the complement of A Is it true or false ? cheers !

    Started by WeeG‎, 04-21-2010 02:21 AM
    • Replies: 1
    • Views: 4,007
    04-21-2010, 04:43 AM Go to last post
  46. least squares

    Hi there, The least squares equations are g1=Σ(y-μ)=0 g2=Σx(y-μ)=0 where μ is b0+b1*x. g1 and g2 take a specific value for each pair of...

    Started by leo nidas‎, 03-23-2010 04:16 AM
    • Replies: 5
    • Views: 3,553
    04-20-2010, 09:34 AM Go to last post
  47. Expected value and variance of bootstrap estimate

    Hi all! I have a question about bootstrapping. Let the variance estimate based on B bootstrap samples be \widehat{SE}^2_B =...

    Started by JennySton‎, 04-18-2010 11:07 AM
    • Replies: 2
    • Views: 8,154
    04-19-2010, 06:59 AM Go to last post
  48. Bayes' Theory

    Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

    Started by flag3k‎, 04-17-2010 11:45 AM
    • Replies: 2
    • Views: 4,634
    04-19-2010, 03:21 AM Go to last post
  49. p-value of empirical distribution

    I obtained an empirical distribution (with simulation) of a specific measure - I have 1000 values. Now I want to do right tail test. How do I get...

    Started by Maverick85‎, 04-17-2010 03:31 PM
    • Replies: 0
    • Views: 5,469
    04-17-2010, 03:31 PM Go to last post
  50. Equation for the Standard Normal Curve

    Does anybody know what the equation is for the standard normal curve? In my statistics class, we use a chart to find areas under the curve given...

    Started by dogginboggin‎, 04-15-2010 08:40 PM
    • Replies: 6
    • Views: 17,487
    04-16-2010, 04:52 PM Go to last post
  51. Expected Maximum for series of Poisson Distributions

    The problem I am working on is this: I have a detector which is an array of 4096 pixels. Each pixel receives an average of N counts. Since this is...

    Started by mickybob‎, 04-15-2010 10:11 AM
    • Replies: 3
    • Views: 5,221
    04-16-2010, 07:23 AM Go to last post
  52. convergence short question

    Hi there, The "n" below is a subscript If Xn is a sequence of random variables and Xn converges to zero almost surely. Can we say something...

    Started by leo nidas‎, 03-30-2010 04:47 AM
    • Replies: 6
    • Views: 3,719
    04-15-2010, 08:19 AM Go to last post
  53. Assesin expected value of X1>X2 after many permutations of not unique values

    Hi all! I have following problem: I have n observed values (some of them are not unique). I permute them many times. Each time I only look at the...

    Started by Maverick85‎, 04-14-2010 02:51 PM
    • Replies: 3
    • Views: 4,041
    04-15-2010, 06:54 AM Go to last post
  54. Expected mean question

    Suppose that a random variable X has distribution given by P(X = x1) = a = 1 - P(X = x2), where a 2 and x1 != 0 and x2 != 0. (a) Find E i do...

    Started by pure_zero‎, 04-08-2010 02:55 AM
    • Replies: 4
    • Views: 3,553
    04-15-2010, 06:49 AM Go to last post
  55. Probaility of one random value being bigger than the other?

    Hi all! Intuition was telling me that probability of one random value being bigger than the other (both values are sampled from same distribution...

    Started by Maverick85‎, 04-14-2010 06:24 AM
    • Replies: 5
    • Views: 3,388
    04-14-2010, 11:01 PM Go to last post
  56. Uniform Probability

    I'm having trouble with this problem, and help would be really appreciated! Suppose a random variable x is best described by a uniform probability...

    Started by krgreider‎, 03-17-2010 09:55 PM
    • Replies: 2
    • Views: 9,322
    04-14-2010, 08:56 PM Go to last post
  57. Probability ?

    A machining operation at Cleveland Tool Works (Process A) produces small parts, 10% of which are defective. A similar operation (Process B) produces...

    Started by ek9_ctr‎, 04-14-2010 05:33 PM
    • Replies: 1
    • Views: 2,883
    04-14-2010, 07:00 PM Go to last post
  58. Urgent help needed please !!

    In a given sample student size of 90, 2 persons are underweight, 61 healthy weight, 25 overweight and 2 obese. If we select a randomly a student from...

    Started by drsayanta‎, 04-14-2010 10:37 AM
    • Replies: 1
    • Views: 2,390
    04-14-2010, 11:40 AM Go to last post
  59. Probability confusion

    Hi guys, I have a question here. I understand the reasoning behind the solution, but I am also wondering about why an alternative solution is not...

    Started by AWayWithWords‎, 04-12-2010 09:13 PM
    • Replies: 3
    • Views: 3,451
    04-13-2010, 09:14 PM Go to last post
  60. overlap integrals for empirical data

    Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

    Started by choschech‎, 04-13-2010 11:27 AM
    • Replies: 2
    • Views: 4,147
    04-13-2010, 08:13 PM Go to last post

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