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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: 30,199
    09-30-2005, 09:44 AM Go to last post
  1. States of a Transition probability matrix

    Hi there, I have a question about the states on a Markov chain that I was hoping some one might be able to explain to me. Say for instance...

    Started by bradyj2‎, 02-06-2012 11:48 AM
    • Replies: 0
    • Views: 3,252
    02-06-2012, 11:48 AM Go to last post
  2. Help

    An interview has been done among a group of students. It is found that 10% have hot breakfast, 20% have hot lunch and 25% have a hot breakfast or a...

    Started by saeed‎, 02-06-2012 07:28 AM
    • Replies: 2
    • Views: 1,490
    02-06-2012, 07:46 AM Go to last post
  3. Proving some axioms about sigma algebra.

    I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

    Started by c2q‎, 02-04-2012 01:13 PM
    • Replies: 9
    • Views: 7,586
    02-05-2012, 10:32 PM Go to last post
  4. Find the sample size

    Given info: cost1=$4, σ1=10, W1=N1/N=0.4 cost2=$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the values of n1/n and n2/n that...

    Started by alias‎, 02-05-2012 05:08 PM
    • Replies: 0
    • Views: 1,392
    02-05-2012, 05:08 PM Go to last post
  5. Poisson distribution and moment generating function question

    This is a problem my professor assigned for homework. He said if we can't do it, it's not a big deal; it's a difficult problem. I'd still like to...

    Started by APOCooter‎, 02-05-2012 02:49 PM
    • Replies: 3
    • Views: 5,753
    02-05-2012, 04:45 PM Go to last post
  6. Gaussian process proof.

    I want to prove that the brownian bridge is a gaussian process. Before I start I just wanted to make sure of something. In my notes my...

    Started by c2q‎, 02-05-2012 04:29 PM
    • Replies: 0
    • Views: 2,932
    02-05-2012, 04:29 PM Go to last post
  7. Proof of covariance of a weak stationary stoch. process.

    Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

    Started by c2q‎, 02-05-2012 02:43 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,756
    02-05-2012, 04:22 PM Go to last post
  8. Help with a proof

    If x1...xk are random variables defined on a set omega, and B1...Bk C R^1, then prove that (x1,....,xk)^-1 (B1x,...,xBk) = x1^-1B1 n x2^-1B2 n ......

    Started by c2q‎, 01-31-2012 05:04 PM
    • Replies: 2
    • Views: 2,307
    02-04-2012, 03:41 PM Go to last post
  9. [SOLVED] Correlation between two normal variables ...

    Suppose A ~ N (0,a), B ~ N (0,b-a), C = A + B what is the expression for the correlation between A and C?

    Started by BigBugBuzzz‎, 02-03-2012 12:37 PM
    2 Pages
    1 2
    correlation, normal random variables
    • Replies: 17
    • Views: 6,874
    02-04-2012, 11:48 AM Go to last post
  10. Keno Game Question

    - This game has 70 balls. - 20 are picked. - 2 are chosen. - Approximate odds of winning are 1 in 13. - Normal payout is 7-1. If the payout...

    Started by Peter Seiller‎, 02-02-2012 04:48 PM
    • Replies: 4
    • Views: 3,091
    02-02-2012, 08:37 PM Go to last post
  11. quick question: probability of being dealt a royal flush?

    if you have a standard deck of cards and are dealt 5 cards randomly, what are the chances of getting a royal flush? i feel like this is pretty...

    Started by Rhodo‎, 01-30-2012 02:04 PM
    • Replies: 5
    • Views: 8,591
    02-02-2012, 05:57 PM Go to last post
  12. Bayes Estimator for Bernoulli/Beta

    Let X be number of successes out of n items The prior is a beta distribution. n := 20 a := 5 b := 10 I need to determine the number of...

    Started by throwback‎, 01-31-2012 07:44 PM
    • Replies: 1
    • Views: 2,983
    02-02-2012, 12:51 PM Go to last post
  13. [SOLVED] New to Probability

    Hello! I am taking my first stats course in University, and I am normally pretty good with number (finished with A+s in linear algebra, and...

    Started by HHPS‎, 02-01-2012 09:58 PM
    • Replies: 5
    • Views: 4,260
    02-01-2012, 11:17 PM Go to last post
  14. negative predictive value/ probability

    \begin{tabular}{|r|rr|} \hline &postive results & negative results\\ \hline pregnant & 80 & 5\\ not pregnant &...

    Started by rilynch‎, 02-01-2012 02:14 PM
    • Replies: 2
    • Views: 2,517
    02-01-2012, 03:06 PM Go to last post
  15. Marginal Densities of 3 Joint Normal r.v.s in Polar Coordinates

    Hey all, So fun question. X, Y and Z are independent ~ N(0,sigma^2). x = r*sin(phi)*cos(theta) y = r*sin(phi)*sin(theta) z = r*cos(phi) 0 <=...

    Started by tritan.ex47‎, 02-01-2012 01:10 AM
    • Replies: 6
    • Views: 3,834
    02-01-2012, 11:12 AM Go to last post
  16. Actuarial Exam P

    Sorry if this isn't really the best place for this question. I passed the exam P and am just trying to figure out how I can determine how many...

    Started by lancearmstrong1313‎, 01-31-2012 01:22 PM
    • Replies: 0
    • Views: 3,563
    01-31-2012, 01:22 PM Go to last post
  17. difference between binomial exact test and fisher's exact test

    Hello all, So I know the general difference between these tests --binomial exact test is used to test for a significant difference between and...

    Started by statsathens‎, 05-12-2011 02:03 PM
    • Replies: 1
    • Views: 18,332
    01-31-2012, 11:04 AM Go to last post
  18. Question Student, Density, Donald Duck

    Hi to all! I don`t know to do this tasks, so I would much apriciate if someone can help :confused: 1) Student needs to answer on n independent...

    Started by Sheldon‎, 01-30-2012 07:19 AM
    • Replies: 2
    • Views: 2,846
    01-31-2012, 07:05 AM Go to last post
  19. Gamma-Poisson - Hierarchical Model

    I have two variables, T = time of person to do a certain task and N = number of steps that person takes to do this task. T has as gamma distribution...

    Started by filipeferminiano‎, 01-30-2012 10:14 PM
    • Replies: 3
    • Views: 3,843
    01-30-2012, 10:54 PM Go to last post
  20. Help about Isserlis’ theorem

    The Isserlis theorem states that if is a zero mean multivariate normal random vector, then : E = EE + EE + EE Now, in the case x,y,z,t are...

    Started by DejanM‎, 01-30-2012 12:38 PM
    • Replies: 0
    • Views: 63,202
    01-30-2012, 12:38 PM Go to last post
  21. Easy question check

    Say event B . = to Event C .the probability of their intersection would be 1? I think this is not true because, there could be other outcomes...

    Started by jacobamark99‎, 01-30-2012 09:06 AM
    • Replies: 1
    • Views: 1,836
    01-30-2012, 12:19 PM Go to last post
  22. Simple probability question

    I've been writing up some basic code for my own trading to show things like, if I have a 70% chance of losing, and each time I lose 5%, I would...

    Started by qwirky64‎, 01-27-2012 02:35 PM
    • Replies: 9
    • Views: 2,395
    01-30-2012, 05:00 AM Go to last post
  23. Question Cycle of permutation Problem

    Dear everyone, I have questions about cycle of permutation. Here are the questions. For ones who haven't heard about cycle, Anyway, I...

    Started by ilhamdoank‎, 10-26-2011 06:10 PM
    • Replies: 3
    • Views: 4,802
    01-30-2012, 01:04 AM Go to last post
  24. [SOLVED] Sensitivity/Specificity

    Here is my question: The sensitivity of a screening test is 0.95 and it's specificity is 0.85. The rate of the disease for which the test is used...

    Started by kelly g‎, 01-28-2012 03:17 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 7,512
    01-29-2012, 11:08 PM Go to last post
  25. Mean and var of maximum of n RVs from uniform dist.

    I am doing a problem that focuses on the maximum of n iid discrete RVs (Ymax) of Y1,...,Yn, each having the same probability distribution with common...

    Started by mada2009‎, 01-29-2012 10:52 AM
    • Replies: 2
    • Views: 4,040
    01-29-2012, 03:44 PM Go to last post
  26. Order Statistics for continuous RVs

    Let Y1,...,Yn be iid RVs, each having uniform distribution on (q,q+1) where q is the unknown parameter to estimate. How can I show that Y_bar-1/2 is...

    Started by mada2009‎, 01-29-2012 10:59 AM
    • Replies: 3
    • Views: 2,650
    01-29-2012, 01:25 PM Go to last post
  27. [SOLVED] Need help with a problem that I THINK requires Bayes Theorem....

    For the combined ELISA-Western blot blood test for HIV positive status, the sensitivity is about 0.999 and the specificity os about 0.9999. Consider...

    Started by kelly g‎, 01-27-2012 09:07 PM
    • Replies: 12
    • Views: 6,922
    01-28-2012, 03:33 PM Go to last post
  28. Independent events?

    I don't know how to do this question...how to find if one event is independent of another. I answered the following question: After surveying...

    Started by kelly g‎, 01-28-2012 01:28 AM
    • Replies: 4
    • Views: 3,794
    01-28-2012, 02:50 PM Go to last post
  29. 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: 1,695
    01-28-2012, 03:37 AM Go to last post
  30. Looking for confirmation that I'm correct...

    just wondering if someone can double check this... 2 cards are randomly selected without replacement. What is the probability that neither are...

    Started by kelly g‎, 01-28-2012 12:21 AM
    • Replies: 3
    • Views: 2,057
    01-28-2012, 02:51 AM Go to last post
  31. Post Please Help with this problem

    Hey Evry1..... I have been facing a problem in achieving the solution for the following question in quite some time. Kindly help me with the...

    Started by nibinenator‎, 01-27-2012 02:22 AM
    • Replies: 4
    • Views: 2,069
    01-27-2012, 11:57 PM Go to last post
  32. [SOLVED] 1st year Biostats student very lost!!! Please help...

    I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

    Started by kelly g‎, 01-27-2012 07:32 PM
    • Replies: 6
    • Views: 2,427
    01-27-2012, 09:01 PM Go to last post
  33. Finding P(X-Y=0)

    Hi, I have several distributions which I want to compare. They include the Burr distribution, Johnson SB, logistic and a few others. They are all...

    Started by julep‎, 01-27-2012 09:33 AM
    • Replies: 2
    • Views: 5,522
    01-27-2012, 04:25 PM Go to last post
  34. basic concept check

    1. If event A and B are independent, would the conditional probability of B given A=1? I say false because it should =p(B) not 1. 2. If event A is...

    Started by kevin.lated‎, 01-27-2012 03:11 PM
    • Replies: 1
    • Views: 1,569
    01-27-2012, 03:19 PM Go to last post
  35. simple cdf and pdf problem?

    Let X and Y be independent random variables, uniformly distributed in the interval . Find the cumulative distribution function and the probability...

    Started by chaopal‎, 01-23-2012 08:37 PM
    • Replies: 1
    • Views: 3,807
    01-27-2012, 01:06 PM Go to last post
  36. variance of product

    hi, i try to prove this property. Verify that: Var=Var.Var +Var.E^2+ Var.E^2 X,Y are independent variables. i tried the definition of variance...

    Started by brad_sue‎, 01-27-2012 09:53 AM
    • Replies: 1
    • Views: 2,196
    01-27-2012, 10:17 AM Go to last post
  37. Poll Poll: practice questions help

    ** picture came out small so will have to use control + function. I have attached the question, my school is trying this online program that...

    Started by kevin.lated‎, 01-26-2012 09:00 PM
    • Replies: 1
    • Views: 1,723
    01-26-2012, 11:50 PM Go to last post
  38. Optimal Sampling Plan

    . Quality Assurance Inspection Sampling: Consider the manufacturing process of commodity computer memory chips. In order to control outgoing...

    Started by MikeM‎, 01-26-2012 03:56 PM
    • Replies: 0
    • Views: 2,253
    01-26-2012, 03:56 PM Go to last post
  39. Unbiased Estimator Question

    Suppose that Y has a Poisson distribution with parameter lambda. How can I show that (-2)^lambda is an unbiased estimator of e^(-3*lambda)?

    Started by mada2009‎, 01-22-2012 04:48 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,538
    01-26-2012, 11:32 AM Go to last post
  40. Unhappy Poison or not Poison, that is the question.... (Shakespeare?)

    Hello, We are investigating vehicle delivery data - which we know if it was pretty random, the arrival intervals of the vehicles will follow a...

    Started by CarelBez‎, 01-26-2012 05:38 AM
    • Replies: 1
    • Views: 2,457
    01-26-2012, 10:41 AM Go to last post
  41. Need help please!!

    A recent study of 300 patients found that of 100 alcoholic patients, 87 had elevated cholestrol levels, and of 200 nonalcoholic patients, 43 had...

    Started by rawdigginz26‎, 01-24-2012 04:26 PM
    • Replies: 1
    • Views: 6,313
    01-25-2012, 12:31 AM Go to last post
  42. Find estimator of minimum mean square error

    The random variables Y1...Yn are NID with parameter u and (sigma)^2. S^2 = (using £ for summation) £ (Yi-Ybar)^2/(n-1) is an unbiased estimator of...

    Started by mada2009‎, 01-23-2012 10:07 AM
    • Replies: 3
    • Views: 3,644
    01-24-2012, 12:49 AM Go to last post
  43. Simple stats question! Thanks!

    Hello, this is just pure curiosity. If you were to have three 6 sided dice and shake them all at once in a cup and throw them at the same time, and...

    Started by SXNO‎, 01-23-2012 01:34 PM
    • Replies: 1
    • Views: 1,413
    01-23-2012, 01:48 PM Go to last post
  44. Find unbiased estimator of minimum variance

    Hi, I'm new to this area of statistics and I could really use some help. Suppose that random variables Y1 and Y2 are independent, both with mean u...

    Started by mada2009‎, 01-22-2012 05:27 PM
    • Replies: 3
    • Views: 6,315
    01-22-2012, 10:16 PM Go to last post
  45. Bayesian updating over multiple distributions

    Say I believe a basketball player's likelihood distribution of making a shot is affected by his distance from the hoop, how well he is being...

    Started by statsanimal‎, 01-17-2012 06:10 PM
    • Replies: 14
    • Views: 3,198
    01-22-2012, 04:00 PM Go to last post
  46. Am I on the right track?

    The researcher in Part A decides to compare the difference in the population proportions of supporters for a reduction in funding between taxpayers...

    Started by figs824‎, 01-21-2012 04:44 PM
    • Replies: 1
    • Views: 1,519
    01-21-2012, 11:56 PM Go to last post
  47. Probably a stupid question

    how do i calculate the exact probablity that a number of taxpayers who support a reduction in funding falls between 342 and 375 people? (sample size...

    Started by figs824‎, 01-21-2012 03:02 PM
    • Replies: 6
    • Views: 1,915
    01-21-2012, 04:45 PM Go to last post
  48. Definition of (objective) Probability

    There are two definition as far as I know (not including subjective probability), and each one has its problems: 1. If O is the set of all equally...

    Started by David1‎, 01-21-2012 06:32 AM
    definition, probability
    • Replies: 1
    • Views: 2,589
    01-21-2012, 09:54 AM Go to last post
  49. expectation problem

    10 balls are inserted (uniformly) into five jars ..each insertion is independent from the others. compute E(X1*X2) where X1 and X2 describes the...

    Started by bravehera1‎, 01-16-2012 04:32 PM
    expectation
    • Replies: 3
    • Views: 3,528
    01-21-2012, 08:58 AM Go to last post
  50. Probability Density Function of normal distribution

    I have a question: Please give the probability density function of a normal distribution trun- cated to . Can anyone pls help me to solve this...

    Started by Putu Prapita‎, 01-20-2012 10:04 PM
    • Replies: 4
    • Views: 3,318
    01-20-2012, 10:21 PM Go to last post
  51. Markov Random Fields

    Hi All, Can anyone kindly refer me to an easily explained tutorial on Markov Random Fields/Markov Networks? Thank you. Meeta

    Started by meeta‎, 01-20-2012 01:33 PM
    • Replies: 0
    • Views: 1,525
    01-20-2012, 01:33 PM Go to last post
  52. Product Normal Distribution

    Hi, Summing normal distributions is nice and easy, providing another normal distribution. But multiplying gives the Product Normal Distribution....

    Started by BigBugBuzzz‎, 01-20-2012 10:51 AM
    productnormaldist
    • Replies: 6
    • Views: 15,979
    01-20-2012, 12:54 PM Go to last post
  53. Post Disease Probability

    I'm stuck on a question. A doctor thinks, before testing, that the probability that his patient has XYZ disease is 85%. He tests 5 times and gets...

    Started by mango1234‎, 01-17-2012 12:50 PM
    conditional probability, disease
    • Replies: 1
    • Views: 1,854
    01-20-2012, 07:16 AM Go to last post
  54. markov chain and stocks

    THe price of a particular stock either increases 25% or decreases 20% in any given week. The probability of an increase in any week is 60%,...

    Started by qootie‎, 01-19-2012 04:44 PM
    • Replies: 1
    • Views: 1,943
    01-20-2012, 07:04 AM Go to last post
  55. Probability Function Problem

    A customer is equally likely to select each of six product brands, labeled "brand one," and so forth. Let X equal the brand number selected. Let Y...

    Started by chipc‎, 01-19-2012 04:14 PM
    • Replies: 1
    • Views: 1,690
    01-20-2012, 06:59 AM Go to last post
  56. markov chain and probability

    A factory produces a sequence of items that can be graded as good or defective. A good item is followed by another gd item with probability alpha amd...

    Started by qootie‎, 01-19-2012 04:49 PM
    • Replies: 1
    • Views: 1,955
    01-20-2012, 06:57 AM Go to last post
  57. Sum of k samples from a normal distribution

    Hi, I'm not sure how to tackle the following question, i would greatly appreciate it if someone can help. Assume you have a room filled with...

    Started by falinn.onda‎, 01-19-2012 02:13 PM
    • Replies: 2
    • Views: 2,795
    01-19-2012, 03:03 PM Go to last post
  58. Raffle with many entries per person, many prizes, limit one prize per person

    Consider a raffle for which each person may buy any number of tickets. There are many prizes but each each person may only win one prize. What is the...

    Started by clint.t.graham‎, 01-17-2012 06:03 PM
    contest, multiple, prize, raffle
    • Replies: 2
    • Views: 7,475
    01-19-2012, 01:55 PM Go to last post
  59. Question Probability of a string containing a specific substring

    So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

    Started by Chris Morrow‎, 10-14-2011 07:39 PM
    infinite monkeys, library of babel, recursive functions, substrings
    • Replies: 1
    • Views: 6,631
    01-18-2012, 11:22 AM Go to last post
  60. please help me with this question?

    the time it takes for me to reach the university from my home has a normal distribution with mean 45 minutes and standard deviation 15 minutes. I...

    Started by navaniDW‎, 01-18-2012 12:33 AM
    • Replies: 8
    • Views: 2,562
    01-18-2012, 01:30 AM Go to last post

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