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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: 24,429
    09-30-2005, 09:44 AM Go to last post
  1. How to calculate posterior probabilities (Bayes related, I think)

    I graduated Uni 16 years ago and generally have no problems with the math and stats I need in my life ... until today. I am breeding horses and there...

    Started by stp486‎, Yesterday 05:37 PM
    • Replies: 0
    • Views: 66
    Yesterday, 05:37 PM Go to last post
  2. Which probability distribution do I use for this, and how?

    Hi all, Im not a statistitian, although I have some reasonable education in mathematics. This isn't a homework question (I'm 37 lol), its just...

    Started by danlightbulb‎, 05-25-2017 04:25 PM
    • Replies: 4
    • Views: 133
    Yesterday, 09:24 AM Go to last post
  3. Simple Problem

    In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

    Started by 5feira‎, 05-19-2017 11:14 PM
    • Replies: 1
    • Views: 275
    05-20-2017, 04:20 AM Go to last post
  4. Distribution of a random sum of random non-iid variables

    I'm trying to find the probability distribution of a sum of a random number of variables which aren't identically distributed. Here's an example: ...

    Started by chaps‎, 05-10-2017 10:11 AM
    • Replies: 1
    • Views: 386
    05-11-2017, 03:32 AM Go to last post
  5. Smile Interpretation of probability density function - uniform distribution

    Dear all, I'm having some problems in the interpretation of the probability density function. Until now I thought that f(x) for a continuous...

    Started by Eometh‎, 05-09-2017 09:48 AM
    density function
    • Replies: 1
    • Views: 259
    05-09-2017, 11:34 PM Go to last post
  6. Smile Chi² distribution link with standard normal distribution?

    Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

    Started by Eometh‎, 04-28-2017 09:27 AM
    • Replies: 4
    • Views: 682
    04-30-2017, 04:26 AM Go to last post
  7. Help please on calculating probabilities of certain coin-flip outcomes

    Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to...

    Started by lingyai‎, 04-26-2017 12:19 PM
    • Replies: 5
    • Views: 425
    04-28-2017, 06:10 PM Go to last post
  8. Expected number of tries to get all N balls

    We took my grandson to the Santa Cruz Boardwalk. He fell in love with the gondola ride. He wants to go back until he has ridden on all of the 32...

    Started by Jennifer Murphy‎, 04-25-2017 06:34 PM
    • Replies: 8
    • Views: 415
    04-27-2017, 10:10 PM Go to last post
  9. Basic Statistics

    I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

    Started by mattman519‎, 04-25-2017 11:46 AM
    • Replies: 4
    • Views: 355
    04-27-2017, 05:38 PM Go to last post
  10. Time Series Analysis

    Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

    Started by StatsOntheSide‎, 10-05-2011 08:00 PM
    • Replies: 7
    • Views: 4,659
    04-18-2017, 03:10 PM Go to last post
  11. A puzzling problem

    Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

    Started by Jheath9131‎, 04-14-2017 07:33 AM
    • Replies: 3
    • Views: 391
    04-18-2017, 02:38 PM Go to last post
  12. Random Vectors and their inner product.

    Let's say i have two random vectors, X and Y, both of length n. The elements of either vector are not independent, and X and Y themselves are not...

    Started by Prometheus‎, 04-18-2017 09:53 AM
    • Replies: 0
    • Views: 258
    04-18-2017, 09:53 AM Go to last post
  13. [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

    I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

    Started by Ardêncio‎, 04-18-2017 08:47 AM
    • Replies: 1
    • Views: 311
    04-18-2017, 09:18 AM Go to last post
  14. Hypothesis testing - Type I and II error relationship needed

    Hi! Any idea about how to proof the inequality in formula 1 (see attatchment)? Thank you!

    Started by Lauralethia‎, 04-16-2017 06:49 PM
    • Replies: 0
    • Views: 292
    04-16-2017, 06:49 PM Go to last post
  15. Smile Hypothetical example of using probability to control emotions in business

    Imagine a company where there are two principals. The first person is the founder and owner of the company. The second person is nearly a partner...

    Started by jwoods76‎, 04-16-2017 05:23 PM
    • Replies: 0
    • Views: 231
    04-16-2017, 05:23 PM Go to last post
  16. Conditional Probability

    I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

    Started by Roohul Amin‎, 03-29-2017 03:13 PM
    • Replies: 6
    • Views: 964
    03-30-2017, 04:11 PM Go to last post
  17. Exponential Distribution Conditional Probability

    Hello, I have been working with Exponential Distribution problems, but have not come across a problem like this one with both Exponential...

    Started by lucian044‎, 03-30-2017 01:52 PM
    conditional, exponential distribution, probability
    • Replies: 1
    • Views: 487
    03-30-2017, 03:42 PM Go to last post
  18. Unhappy ordering Probabilty in coin tosses

    Hi Guys, First post here so please accept my apologies if this question was posted before. This is baffling me for quite a few days now and I...

    Started by Panda101‎, 03-30-2017 12:01 PM
    • Replies: 4
    • Views: 393
    03-30-2017, 02:06 PM Go to last post
  19. Probability with Permutations Question

    Hello! This is my first time posting and I would appreciate any help at all! So the problem I'm working on has to do with randomly choosing letters...

    Started by lucian044‎, 03-30-2017 11:06 AM
    choose, letters, permutation, probability, random
    • Replies: 4
    • Views: 281
    03-30-2017, 11:58 AM Go to last post
  20. Conditional Probability

    Dear all Please help in solving the following problem. A large industrial firm uses 3 local motels to provide overnight accommodations for its...

    Started by Roohul Amin‎, 03-29-2017 04:10 AM
    • Replies: 1
    • Views: 378
    03-29-2017, 06:59 AM Go to last post
  21. Estimating probability of critical value

    Hello everyone, Once we get a critical value (for example 4.5) how can we estimate the probability of having a value higher than 4.5 if the...

    Started by Eometh‎, 03-24-2017 04:11 AM
    • Replies: 1
    • Views: 721
    03-24-2017, 09:11 AM Go to last post
  22. Probability and roundoff errors

    Hi, I work on a real life problem with roundoff errors and found a glitch in my thinking. If someone knows how to solve this problem I appreciate...

    Started by jcarne‎, 03-21-2017 04:34 PM
    • Replies: 1
    • Views: 511
    03-23-2017, 10:38 AM Go to last post
  23. Basic probability distribution table problem

    "What is P(X>4.74)". Can someone please explain how I'd go about this? Would it just be P(5) + P(6)? Thanks a lot.

    Started by touran‎, 03-19-2017 01:49 PM
    • Replies: 1
    • Views: 482
    03-19-2017, 02:51 PM Go to last post
  24. Union and intersection

    43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is...

    Started by Regulus‎, 03-14-2017 10:06 PM
    • Replies: 5
    • Views: 806
    03-18-2017, 06:05 PM Go to last post
  25. Urgent: Probability of having Lyme Disease and Bayes theorem

    I recently found a deer tick on me (had been there for several days). I have no symptoms. My Dr. says I could ignore it or take a course of...

    Started by ihf‎, 03-13-2017 09:44 AM
    • Replies: 14
    • Views: 700
    03-13-2017, 06:02 PM Go to last post
  26. Post conditional probability

    Hello, I have a list of products and for each product corresponds an RCA index as shown in the attached table. I would like to calculate for both...

    Started by gammoudi‎, 03-09-2017 09:41 AM
    • Replies: 3
    • Views: 738
    03-09-2017, 04:09 PM Go to last post
  27. Confidence levels

    Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

    Started by Pigmy‎, 03-07-2017 02:23 PM
    • Replies: 3
    • Views: 750
    03-07-2017, 10:33 PM Go to last post
  28. CDF of a PDF with a negative power

    I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

    Started by endlessend25‎, 03-03-2017 12:19 PM
    density function, self-study
    • Replies: 3
    • Views: 842
    03-04-2017, 12:06 AM Go to last post
  29. I need help with a difficult problem

    Here's the problem: Each trial can have 3 outcomes with different chances of each, let's say P(A) = .2, P(B) = .15, and P(C) = .65. I want to find...

    Started by Lazaeus‎, 03-03-2017 01:59 PM
    • Replies: 1
    • Views: 620
    03-03-2017, 05:02 PM Go to last post
  30. Exclamation Probability of an Event...in a certain Time!

    Hi Guys, This is probably a basic question for you lot...but let's say I had calculated the chance of an event happening (in this case lets say a...

    Started by SMITH1988CJ‎, 02-28-2017 05:25 PM
    • Replies: 4
    • Views: 807
    03-02-2017, 05:06 PM Go to last post
  31. bayes for generating new data

    I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

    Started by andyspeak‎, 03-01-2017 09:25 AM
    bayes, generate data, spatial statistics
    • Replies: 3
    • Views: 752
    03-02-2017, 04:20 AM Go to last post
  32. Roulette - expected value

    Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

    Started by federico.zampini‎, 02-09-2017 11:08 AM
    • Replies: 7
    • Views: 1,057
    03-02-2017, 04:06 AM Go to last post
  33. Exclamation Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

    Started by aptremblay‎, 03-01-2017 03:46 PM
    probability, probability homework help, statistics, statistics problems
    • Replies: 5
    • Views: 632
    03-01-2017, 06:30 PM Go to last post
  34. Different solutions when using direct calculation and Chebychev's inequality

    Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

    Started by stasezer‎, 02-22-2017 11:39 AM
    chebychev's inequality, probability density
    • Replies: 1
    • Views: 884
    02-23-2017, 06:05 PM Go to last post
  35. Fixing the low value and high value in a probabilistic simulation

    Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

    Started by depakroshanblu‎, 02-20-2017 08:58 AM
    • Replies: 10
    • Views: 1,045
    02-23-2017, 03:33 PM Go to last post
  36. Probability of storm surge given parameters for hurricanes.

    I've been working through some statistics problems and could use a little guidance on how to arrive at the right answer (and more importantly, why...

    Started by Foxhound013‎, 02-18-2017 05:35 PM
    • Replies: 4
    • Views: 919
    02-23-2017, 01:00 AM Go to last post
  37. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 601
    02-21-2017, 02:47 AM Go to last post
  38. Probability of throwing n different numbers in m throws of a dice

    Folks I know how to calculate the probability of throwing the same number in every throw of a dice (die, if you prefer!), and I know how to...

    Started by Remster‎, 02-20-2017 05:03 AM
    dice, probability
    • Replies: 1
    • Views: 545
    02-20-2017, 11:03 PM Go to last post
  39. Mean waiting time due to aggregation of k poisson arrivals

    Dear Experts: I want to calculate the mean waiting time due to aggregation of k arrivals following poisson process with rate #λ#. Arrivals are served...

    Started by Hallian1990‎, 02-17-2017 05:59 PM
    probabilities, probability distributions, probability function, queuing, queuing theory
    • Replies: 1
    • Views: 810
    02-18-2017, 08:54 PM Go to last post
  40. Probability Question

    Hi Everyone, I'm looking to calculate the probability of the time taken for a specific event. I have: The best case scenario which normally...

    Started by goulding74‎, 02-17-2017 08:58 AM
    lean six sigma, probability
    • Replies: 1
    • Views: 592
    02-17-2017, 03:41 PM Go to last post
  41. Question on sampling without replacement

    Here is a question regarding sampling without replacement. Say there is a class size of 24, and the teacher is breaking students into groups of...

    Started by sjd7aa‎, 02-15-2017 08:30 PM
    • Replies: 1
    • Views: 734
    02-16-2017, 07:25 PM Go to last post
  42. Unhappy Conditional Probability Problem Help!

    Hey guys, I got this question as a practice problem. I believe that it's a conditional probability where I should find the probability of NOT...

    Started by nannan‎, 02-15-2017 09:00 PM
    • Replies: 1
    • Views: 828
    02-15-2017, 11:08 PM Go to last post
  43. MGF of sample mean of IID poisson RVs

    I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ...

    Started by nsus‎, 02-12-2017 11:02 AM
    mgf, sample mean
    • Replies: 5
    • Views: 1,044
    02-14-2017, 08:26 PM Go to last post
  44. Question Probability

    (This is a question on probability, not a discussion on politics. Hate or love the President, I hope you all can respond with a mathematical...

    Started by vspinnet‎, 02-13-2017 07:27 AM
    • Replies: 0
    • Views: 720
    02-13-2017, 07:27 AM Go to last post
  45. probability


    Started by asonibareoyindamola‎, 02-10-2017 07:49 PM
    • Replies: 1
    • Views: 807
    02-10-2017, 08:03 PM Go to last post
  46. Probability to draw an odd number before an even number

    There's 39 numbers in a jar and we're picking them without putting them back. The probability of drawing an odd number and then an even number is...

    Started by TheElder‎, 02-10-2017 06:27 PM
    • Replies: 3
    • Views: 750
    02-10-2017, 08:02 PM Go to last post
  47. A random variable's median and variance.

    -Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

    Started by Kayl‎, 02-09-2017 05:43 AM
    probability mass function
    • Replies: 0
    • Views: 677
    02-09-2017, 05:43 AM Go to last post
  48. What is the difference between classical and bayesian understanding of probability?

    I am reading a book on monte carlo analysis and the author stresses in passing that the definition of probability used in an example in the book is...

    Started by noetsi‎, 02-07-2017 05:47 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 1,538
    02-08-2017, 10:28 PM Go to last post
  49. Combining multiple probabilistic weather signals with cumulative binary dist

    If I have a stable of separate, independent models (N = 19 of them) that are using different inputs to each generate a probabilistic forecast for...

    Started by dallasdallas‎, 02-08-2017 09:33 PM
    • Replies: 0
    • Views: 467
    02-08-2017, 09:33 PM Go to last post
  50. Question Probability problem help

    I need help with 2 quizes: first: ...

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 750
    02-05-2017, 12:59 PM Go to last post
  51. Axioms of probability and sigma additivity

    The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

    Started by Weiss‎, 01-27-2017 10:05 PM
    additivity, axiom, measure
    • Replies: 6
    • Views: 1,825
    02-03-2017, 04:06 PM Go to last post
  52. Gambler's ruin problem - modified

    Hi there, I'm a probability newbie. Can anyone help me with the following problem? A player begins with £1 and each round they can wager £1 on...

    Started by federico.zampini‎, 02-01-2017 12:01 PM
    • Replies: 5
    • Views: 1,245
    02-02-2017, 11:48 AM Go to last post
  53. Probability of how many times one need to throw a coin to get a head twice in a row?

    Hi! New here, first thread! My issue is to explain why the probability function of how many times one need to throw a coin to get a head...

    Started by filippa‎, 01-29-2017 07:10 AM
    • Replies: 3
    • Views: 1,000
    02-02-2017, 01:52 AM Go to last post
  54. What will be the Probability?

    If a treatment for cancer has 90% success rate, the remaining 10% die. If two patients come for treatment, what is the probability that one will die?

    Started by Dr.Faraz‎, 01-30-2017 01:34 PM
    probability estimate, probability question
    • Replies: 0
    • Views: 706
    01-30-2017, 01:34 PM Go to last post
  55. normal distribution z score problem

    QUESTION: A normal distribution has a mean of 70 and a standard deviation of 15. Determine the value above which 80 percent of the values will...

    Started by subaru537‎, 01-29-2017 04:38 PM
    • Replies: 1
    • Views: 907
    01-29-2017, 09:55 PM Go to last post
  56. Pro / Stat Problems HELP!!!

    In many cases, you can model a binary communication system as follows. A 0 or 1 is chosen as the message and the transmitter sends a signal over a...

    Started by proo2k17‎, 01-29-2017 08:56 PM
    • Replies: 0
    • Views: 844
    01-29-2017, 08:56 PM Go to last post
  57. Dice Total Odds Calculator

    I have posted a calculator to the Google Play Store for computing the probability of obtaing a particular sum when throwing dice:...

    Started by ksoileau‎, 01-29-2017 06:32 PM
    • Replies: 0
    • Views: 785
    01-29-2017, 06:32 PM Go to last post
  58. Simple Z score probability

    QUESTION: The monthly sales of mufflers follow the normal distribution with a mean of 1350 and a standard deviation of 250. The manufacturer...

    Started by subaru537‎, 01-29-2017 04:34 PM
    • Replies: 0
    • Views: 685
    01-29-2017, 04:34 PM Go to last post
  59. Probability of Horse Racing (odds aside)

    Hello In a 10 horse race - if I select two horses in the same race to run either 1st , 2nd or 3rd what are the odds of - one of the horses...

    Started by Mij‎, 01-29-2017 12:00 AM
    • Replies: 0
    • Views: 727
    01-29-2017, 12:00 AM Go to last post
  60. Need help with conditional probability with multiple trials.

    So lets say, a if a tester gives me value of 40, then there is a 30% chance the machine is faulty. If the testers gives me a value of 20, there is a...

    Started by khamaar‎, 01-26-2017 03:25 PM
    • Replies: 2
    • Views: 1,183
    01-26-2017, 08:41 PM Go to last post

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