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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: 30,193
    09-30-2005, 09:44 AM Go to last post
  1. Probabilities Logical Problem

    Hi, i would like to leave you here a logical problem related with probabilities, if you can help me i would appreciate a lot!. The problem: You...

    Started by Fernando.89‎, 02-19-2013 07:15 PM
    • Replies: 2
    • Views: 1,020
    02-20-2013, 01:59 PM Go to last post
  2. Help With Potential Textbook Error

    I'm reading through the statistics chapter in my research methods textbook and think I may have found a mistake. I was hoping someone here could...

    Started by vw2000‎, 02-19-2013 06:06 PM
    • Replies: 5
    • Views: 793
    02-20-2013, 11:15 AM Go to last post
  3. Here's a good brain puzzler:

    If I choose an answer at random, what's the probability of getting it correct? A) 25% B) 0% C) 50% D) 25%

    Started by Nathan G‎, 02-19-2013 09:29 PM
    paradox, probability, puzzles
    • Replies: 4
    • Views: 1,062
    02-20-2013, 09:24 AM Go to last post
  4. basic question: random variables

    Hello all, I just came across this wonderful forum and was pleasantly surprised by the wealth of information and rich discussion here! I am...

    Started by pamparana‎, 02-19-2013 10:47 AM
    • Replies: 4
    • Views: 2,031
    02-19-2013, 06:34 PM Go to last post
  5. regression choice

    I made survey for my master tesis. And it is a problem now to choose the method to analyse the model. I can use buying probability after event or...

    Started by yulia‎, 02-19-2013 03:12 PM
    • Replies: 3
    • Views: 1,673
    02-19-2013, 04:39 PM Go to last post
  6. Transition matrix to compact set of rules?

    Hello. Could you please point me to some methods of extracting a compact set of rules that describe a Markov chain, given that chain's (often very...

    Started by arataj‎, 02-17-2013 02:32 AM
    • Replies: 2
    • Views: 1,243
    02-17-2013, 07:16 AM Go to last post
  7. Study question

    Reviewing for an exam I have become stumped, \int_{1}^{x} {3}{t}^{-4}{dt} =1-{x}^{-3} P(x<2|x \geq 1.5) and so on

    Started by Matthew18342‎, 02-15-2013 02:36 PM
    • Replies: 6
    • Views: 1,792
    02-15-2013, 03:28 PM Go to last post
  8. Moved: Data Entry

    Started by Matthew18342‎, 02-15-2013 01:15 PM
    • Replies: -
    • Views: -
    02-15-2013, 01:22 PM Go to last post
  9. Discrete Optimization Question

    1. The problem statement 9. This is a simplified inventory problem.Suppose that it costs c dollars to stock an item and that the item sells for s...

    Started by gajohnson‎, 02-13-2013 11:03 PM
    • Replies: 5
    • Views: 3,247
    02-15-2013, 12:48 PM Go to last post
  10. Question Simple conditional probabilities

    Hello, I am currently reading an image processing paper that involves conditional probabilities in one section, but my probability classes are way...

    Started by assis‎, 02-14-2013 08:12 PM
    • Replies: 1
    • Views: 1,743
    02-15-2013, 12:31 AM Go to last post
  11. Asynchronis Particle Counting

    I have particles incident on a detector at 1000 events/sec. My detector is turning on and off at 1000 e/s bu only for 10% of the time, asynchronis to...

    Started by dfperrault‎, 02-14-2013 05:27 PM
    • Replies: 0
    • Views: 993
    02-14-2013, 05:27 PM Go to last post
  12. Confirm my results for me

    1. The police confiscated 500 tablets suspected to contain ecstasy. A sample of 15 tablets were sent to the laboratory for analysis. After getting...

    Started by asterlaw‎, 02-14-2013 02:02 PM
    • Replies: 1
    • Views: 1,607
    02-14-2013, 02:45 PM Go to last post
  13. quantify difference between discrete distributions

    Hello, I am trying to quantify the difference between two discrete distributions. I have been reading online and there seems to be a few...

    Started by bradyj2‎, 02-14-2013 09:49 AM
    • Replies: 0
    • Views: 1,564
    02-14-2013, 09:49 AM Go to last post
  14. Post Problem Understanding Simple Example

    I have a simple example that I do not understand. I would really appreciate some help. It's been 30 years since I had a class in probability :) ...

    Started by BillyBob‎, 02-13-2013 10:49 PM
    • Replies: 1
    • Views: 1,746
    02-14-2013, 05:38 AM Go to last post
  15. Double Exponential Density

    Hi All, I've got a question on which I'm hoping someone might be able to help! 1. Problem Let T be an exponential random variable with...

    Started by gajohnson‎, 02-13-2013 10:54 PM
    • Replies: 1
    • Views: 3,462
    02-14-2013, 01:11 AM Go to last post
  16. Help applying correlation coefficient to calculate paired statistical outcome

    Hi there, I was wondering if anyone would be willing to help me, or point me to where I can find the info I seek. I'm doing some probabilistic...

    Started by vinomarky‎, 02-13-2013 06:31 AM
    • Replies: 2
    • Views: 1,832
    02-13-2013, 03:38 PM Go to last post
  17. joint probability

    is the product of a probability function in x and a probability density distribution in x a function describing joint probability as function of x?

    Started by buchenstein‎, 02-12-2013 05:54 PM
    • Replies: 2
    • Views: 1,306
    02-13-2013, 03:01 AM Go to last post
  18. Help create a payoff table!

    Would the states of nature and decisions be the same?! Suppose that Willy has to decide on the number of special Valentine boxes to make prior to...

    Started by Kennedy‎, 02-11-2013 03:18 PM
    • Replies: 1
    • Views: 2,898
    02-12-2013, 10:38 AM Go to last post
  19. HELP: Creating an ordered list of objects; independent/dependent events

    Let us say that I have an ordered list of objects (numbered balls). From this list of N balls, I am going to choose seven of them and place them...

    Started by Benjamin Durbin‎, 02-11-2013 07:19 PM
    • Replies: 0
    • Views: 1,002
    02-11-2013, 07:19 PM Go to last post
  20. Copula decomposition

    Hello, I need to estimate correlations in the conditional distribution p(y|theta,eta) using copula. Theta is a scalar and eta is 3x1 vector. For...

    Started by Marek‎, 02-11-2013 04:39 AM
    • Replies: 0
    • Views: 935
    02-11-2013, 04:39 AM Go to last post
  21. Student - t CDF

    Hello, I need to evaluate multivariate student-t CDF at various points, my software enables to evaluate CDF of student-t with mean zero and...

    Started by Marek‎, 02-07-2013 02:57 AM
    • Replies: 2
    • Views: 1,241
    02-11-2013, 04:15 AM Go to last post
  22. Decision Trees

    I know how to pull back the tree, but I can't figure out how to draw them from a story! Here's the story, please help the best you can: EnvirNova...

    Started by Kennedy‎, 02-10-2013 05:27 PM
    • Replies: 1
    • Views: 1,195
    02-10-2013, 10:23 PM Go to last post
  23. High order Markov Chains

    Hi, i'm stuck in a task of simulating a binary sample from a Markov chain of high order (say q>100). Does anyone knows an algorithm to do this? ...

    Started by pitfall‎, 02-09-2013 10:04 AM
    • Replies: 0
    • Views: 1,391
    02-09-2013, 10:04 AM Go to last post
  24. two-sample Kolmogorov-Smirnov test

    Hello, Hello, I have recorded some discrete data with an unspecified distribution. I have generated some discrete data from a model. I'm...

    Started by bradyj2‎, 02-08-2013 08:54 AM
    • Replies: 0
    • Views: 788
    02-08-2013, 08:54 AM Go to last post
  25. Distribution

    We have an interval , which we divide into k equally sized subintervals and generate n observations. Lets call the number of observations which falls...

    Started by Kresch‎, 02-07-2013 02:23 PM
    • Replies: 3
    • Views: 1,250
    02-08-2013, 08:50 AM Go to last post
  26. Probability- Expected Value

    Every year at this time Willy Wonka makes special heart shaped boxes of candy to sell for Valentine's Day. The probability distribution of sales in...

    Started by Kennedy‎, 02-07-2013 12:09 PM
    • Replies: 1
    • Views: 1,261
    02-07-2013, 12:26 PM Go to last post
  27. Looking at the information

    I could stare at this and saunter over it for hours but I still don't know which way to interpret this problem. It is basically the last problem in...

    Started by madenew‎, 02-06-2013 04:33 PM
    • Replies: 3
    • Views: 2,205
    02-07-2013, 05:32 AM Go to last post
  28. simple probability question

    So i just wrote a test and i answered this question as 50% tell me if i am right supposed 50% of all students in the world read newspaper. 5...

    Started by briankimmy‎, 02-06-2013 04:33 PM
    • Replies: 2
    • Views: 962
    02-06-2013, 07:59 PM Go to last post
  29. 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: 1,155
    02-06-2013, 12:58 PM Go to last post
  30. Probability Distributions

    Hi, I understand all the fuss about normal distribution. a lot of real life events and their probability of occurence follow a normal...

    Started by 30percent‎, 01-11-2013 08:16 PM
    • Replies: 3
    • Views: 1,589
    02-06-2013, 12:36 PM Go to last post
  31. Angry Probability of Drivinf while intoxicated

    On New Year's Eve, the probability of a person having a car accident is 0.09. The probability of a person driving wh)le intoxicated is 0.32 and...

    Started by Dchaser‎, 02-04-2013 01:15 AM
    • Replies: 2
    • Views: 3,679
    02-05-2013, 08:32 AM Go to last post
  32. p value chi-square vs. randomization test

    Hi, I am conducting a meta-analysis, using Random effects model, with a categorical variable, I need help to interpret restuls where for between...

    Started by sania‎, 02-03-2013 09:56 PM
    • Replies: 0
    • Views: 2,257
    02-03-2013, 09:56 PM Go to last post
  33. creating conditional probability distribution

    I have a system which visits two locations and collects signals every 10 seconds. It is well known that A causes B to occur but not all the time. So,...

    Started by Vatsa‎, 02-03-2013 05:19 PM
    conditional probabilities
    • Replies: 0
    • Views: 1,992
    02-03-2013, 05:19 PM Go to last post
  34. Law of Total Expectation

    Suppose a box initially contains 1 red marble and 1 black marble and that, at each time n = 1, 2, ..., we randomly select a marble from the box and...

    Started by adnaps1‎, 02-03-2013 05:51 AM
    • Replies: 3
    • Views: 2,165
    02-03-2013, 04:26 PM Go to last post
  35. Finding UNcondintional Mean and Variance of U

    Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

    Started by S-C-3-1-3‎, 02-01-2013 02:57 AM
    • Replies: 8
    • Views: 5,919
    02-03-2013, 09:43 AM Go to last post
  36. Histogramms and the Central limit theorem

    Hi everybody I was wondering the following: If we make histogramms for a large number of samples for any aribitrary distribution (and assume that...

    Started by Fiona555‎, 02-02-2013 05:05 PM
    central limit theorem
    • Replies: 1
    • Views: 2,972
    02-03-2013, 06:17 AM Go to last post
  37. E[MSE] simple linear regression

    Hi All- I am trying to figure out how to prove that MSE = SSE/n-2 is an unbiased estimator of sigma^2 in simple linear regression. I have that...

    Started by B_Miner‎, 10-01-2009 07:42 PM
    sigma^2, unbiased estimator
    • Replies: 14
    • Views: 41,504
    02-02-2013, 03:44 AM Go to last post
  38. Probability - Distribution ?

    According to experts, each year there is about 18% of all federal taxpayers who would file an incorrect tax return. The Canada Customs & Revenue...

    Started by Kennedy‎, 01-31-2013 02:12 PM
    • Replies: 1
    • Views: 2,549
    02-01-2013, 02:40 AM Go to last post
  39. Combinational problem

    This homework problem has me stumped. I have a pretty logical result b/c I think I use all of the 5 credits needed. The problem states, A video...

    Started by madenew‎, 01-29-2013 02:09 AM
    • Replies: 3
    • Views: 1,912
    02-01-2013, 12:39 AM Go to last post
  40. Having trouble with an expected value manipulation

    I'm having a little trouble with part a. Okay, okay, I'm having trouble with all of it, but I'm guessing that solving a will help with the rest....

    Started by alice9725‎, 01-31-2013 03:25 AM
    • Replies: 5
    • Views: 2,687
    01-31-2013, 10:54 PM Go to last post
  41. Calculating Probability of Failure

    I am a solicitor with an engineering background. I have a client who needs to work out what the probability is that a customer will be injured by a...

    Started by alexmay‎, 01-31-2013 06:46 AM
    • Replies: 6
    • Views: 2,914
    01-31-2013, 02:32 PM Go to last post
  42. I've got a question about Pr(A|B)

    So my goal is to find the Pr(AuB) and I thought this may work but the answer is only a little bit to much. I want to first ask something and then try...

    Started by madenew‎, 01-30-2013 05:02 PM
    • Replies: 2
    • Views: 1,615
    01-30-2013, 05:55 PM Go to last post
  43. Probability PLEASE HELP!

    Someone told me the answer was 1, but I don't know how to show the work. Among those western Nova Scotia applicants for commercial loans at MCB...

    Started by Kennedy‎, 01-30-2013 02:31 PM
    • Replies: 1
    • Views: 932
    01-30-2013, 03:02 PM Go to last post
  44. Probability?

    There is a 50‐50 chance that the king carries the gene of twins. If he is a carrier, then each princess has a 50‐50 chance of having twins...

    Started by shakeel7‎, 01-29-2013 03:13 PM
    • Replies: 1
    • Views: 1,549
    01-30-2013, 04:49 AM Go to last post
  45. Probability?

    The final grades given by two professors in introduction to Sociology course have been carefully examined. The students in the first professor’s...

    Started by shakeel7‎, 01-29-2013 03:14 PM
    • Replies: 1
    • Views: 1,163
    01-30-2013, 04:48 AM Go to last post
  46. help me!

    about 0.025 or 2.5% of the cedar trees in that pasture are shorter than how many feet in height? how could i solve it? help me as soon as...

    Started by duykhanh992‎, 01-29-2013 01:40 AM
    • Replies: 3
    • Views: 1,681
    01-30-2013, 02:04 AM Go to last post
  47. Probably easy probability question

    Hi, I'm an engineer who have just started studying statistics and I have this question I just can't seem to get right. The question at hand is you...

    Started by suppe90‎, 01-29-2013 02:54 PM
    • Replies: 4
    • Views: 1,653
    01-29-2013, 05:37 PM Go to last post
  48. Probabbility?

    Simran can either take a course in Math or in Biology, if Simran takes the math course, then she will receive an A grade with probability 1/5. If she...

    Started by shakeel7‎, 01-29-2013 03:11 PM
    • Replies: 2
    • Views: 1,215
    01-29-2013, 03:38 PM Go to last post
  49. 4-alternative forced choice problem

    Hi there, I have the following problem: Participants in my experiment were presented with 4 objects and 4 categories and asked to map each of...

    Started by ClementFerrand‎, 01-29-2013 12:29 PM
    4afc, combinatorics, probability
    • Replies: 2
    • Views: 2,793
    01-29-2013, 12:45 PM Go to last post
  50. help!!!

    An investor holds two stocks, each of which can rise (R), remain unchanged (U), or decline (D) on any particular day. Assume that for the first...

    Started by duykhanh992‎, 01-28-2013 01:35 AM
    • Replies: 3
    • Views: 4,303
    01-29-2013, 05:58 AM Go to last post
  51. Is this right?

    Can you check if my solution is right for the 2 questions below? 1. An airliner has 2 p.m., 8 p.m., and 10 a.m. flights from Montreal to...

    Started by splatapus‎, 01-28-2013 10:32 PM
    • Replies: 0
    • Views: 2,291
    01-28-2013, 10:32 PM Go to last post
  52. 52 card deck

    Ok, I have been trying to solve part d) in my homework for the past hour and then I turned to the web and still couldn't find an answer. This is an...

    Started by madenew‎, 01-27-2013 01:55 AM
    conditional probability, standard deck
    • Replies: 4
    • Views: 2,393
    01-27-2013, 11:52 PM Go to last post
  53. Probability- Combinations

    I need help getting started with this question. We've done combination questions, but not with percents, and its throwing me off. Computer...

    Started by Kennedy‎, 01-27-2013 03:11 PM
    combinations, math, probability
    • Replies: 2
    • Views: 1,169
    01-27-2013, 10:17 PM Go to last post
  54. 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: 1,013
    01-27-2013, 03:31 AM Go to last post
  55. Central Limit Theorem Problem

    Hey folks, I am working on this problem and found several solutions, but none the same! A business ships its products, variable in weight,...

    Started by Slime‎, 01-26-2013 12:01 PM
    • Replies: 1
    • Views: 1,913
    01-26-2013, 12:39 PM Go to last post
  56. Combine Normal Distributions

    How do you combine multiple normal distributions with different standard deviations and means, to produce one representative normal distribution? ...

    Started by x46949‎, 05-01-2011 03:23 PM
    • Replies: 12
    • Views: 20,710
    01-26-2013, 12:51 AM Go to last post
  57. Networking probability theory; packet length, time of transmission, etc; need help

    Assume that an application sends packets over a communication link with a capacity of C bits per second, i.e. when the packet is l0 bits long, then...

    Started by zeion‎, 01-25-2013 03:07 PM
    • Replies: 2
    • Views: 1,885
    01-25-2013, 11:17 PM Go to last post
  58. Conditional probability

    Hi guys. I am currently preparing for SOA Exam P and am having some questions. In a survey of 94 students, the following data was obtained. 60...

    Started by ratloverice‎, 01-25-2013 01:19 PM
    • Replies: 0
    • Views: 1,333
    01-25-2013, 01:19 PM Go to last post
  59. 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: 1,435
    01-24-2013, 11:47 PM Go to last post
  60. 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: 1,680
    01-24-2013, 01:06 PM Go to last post

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