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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: 22,850
    09-30-2005, 09:44 AM Go to last post
  1. 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: 209
    Today, 04:26 AM Go to last post
  2. 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: 224
    04-28-2017, 06:10 PM Go to last post
  3. 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: 255
    04-27-2017, 10:10 PM Go to last post
  4. 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: 217
    04-27-2017, 05:38 PM Go to last post
  5. 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: 4,099
    04-18-2017, 03:10 PM Go to last post
  6. 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: 285
    04-18-2017, 02:38 PM Go to last post
  7. 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: 145
    04-18-2017, 09:53 AM Go to last post
  8. [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: 203
    04-18-2017, 09:18 AM Go to last post
  9. 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: 213
    04-16-2017, 06:49 PM Go to last post
  10. 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: 166
    04-16-2017, 05:23 PM Go to last post
  11. 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: 784
    03-30-2017, 04:11 PM Go to last post
  12. 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: 369
    03-30-2017, 03:42 PM Go to last post
  13. 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: 305
    03-30-2017, 02:06 PM Go to last post
  14. 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: 189
    03-30-2017, 11:58 AM Go to last post
  15. 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: 262
    03-29-2017, 06:59 AM Go to last post
  16. 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: 522
    03-24-2017, 09:11 AM Go to last post
  17. 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: 377
    03-23-2017, 10:38 AM Go to last post
  18. 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: 337
    03-19-2017, 02:51 PM Go to last post
  19. 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: 576
    03-18-2017, 06:05 PM Go to last post
  20. 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
    bayes
    • Replies: 14
    • Views: 530
    03-13-2017, 06:02 PM Go to last post
  21. 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: 561
    03-09-2017, 04:09 PM Go to last post
  22. 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: 527
    03-07-2017, 10:33 PM Go to last post
  23. 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: 609
    03-04-2017, 12:06 AM Go to last post
  24. 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: 443
    03-03-2017, 05:02 PM Go to last post
  25. 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
    probability
    • Replies: 4
    • Views: 590
    03-02-2017, 05:06 PM Go to last post
  26. 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: 532
    03-02-2017, 04:20 AM Go to last post
  27. 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
    probab
    • Replies: 7
    • Views: 801
    03-02-2017, 04:06 AM Go to last post
  28. 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: 447
    03-01-2017, 06:30 PM Go to last post
  29. 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: 653
    02-23-2017, 06:05 PM Go to last post
  30. 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: 787
    02-23-2017, 03:33 PM Go to last post
  31. 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: 720
    02-23-2017, 01:00 AM Go to last post
  32. 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: 441
    02-21-2017, 02:47 AM Go to last post
  33. 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: 399
    02-20-2017, 11:03 PM Go to last post
  34. 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: 580
    02-18-2017, 08:54 PM Go to last post
  35. 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: 438
    02-17-2017, 03:41 PM Go to last post
  36. 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: 548
    02-16-2017, 07:25 PM Go to last post
  37. 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: 612
    02-15-2017, 11:08 PM Go to last post
  38. 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: 790
    02-14-2017, 08:26 PM Go to last post
  39. 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: 542
    02-13-2017, 07:27 AM Go to last post
  40. probability

    probability

    Started by asonibareoyindamola‎, 02-10-2017 07:49 PM
    • Replies: 1
    • Views: 617
    02-10-2017, 08:03 PM Go to last post
  41. 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: 558
    02-10-2017, 08:02 PM Go to last post
  42. 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: 475
    02-09-2017, 05:43 AM Go to last post
  43. 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: 1,180
    02-08-2017, 10:28 PM Go to last post
  44. 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: 327
    02-08-2017, 09:33 PM Go to last post
  45. Question Probability problem help

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

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 540
    02-05-2017, 12:59 PM Go to last post
  46. 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: 1,252
    02-03-2017, 04:06 PM Go to last post
  47. 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: 892
    02-02-2017, 11:48 AM Go to last post
  48. 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: 728
    02-02-2017, 01:52 AM Go to last post
  49. 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: 490
    01-30-2017, 01:34 PM Go to last post
  50. 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: 636
    01-29-2017, 09:55 PM Go to last post
  51. 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: 589
    01-29-2017, 08:56 PM Go to last post
  52. 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: 555
    01-29-2017, 06:32 PM Go to last post
  53. 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: 495
    01-29-2017, 04:34 PM Go to last post
  54. 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: 489
    01-29-2017, 12:00 AM Go to last post
  55. 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: 808
    01-26-2017, 08:41 PM Go to last post
  56. Unhappy Doing Probability through Excel

    Hi everyone! This is my first post here so I hope I am doing it correctly. So I have been given a piece of work from my university in regards to...

    Started by Lundy96‎, 01-24-2017 06:55 AM
    excel, probability
    • Replies: 1
    • Views: 849
    01-26-2017, 08:22 PM Go to last post
  57. Expected value

    I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

    Started by brainfried78‎, 01-25-2017 12:10 AM
    • Replies: 4
    • Views: 1,273
    01-25-2017, 09:31 PM Go to last post
  58. Probability Homework problem

    My 7-grade daughter brought this problem home today and having trouble figuring it out. Each box contains a pen with one of four colors, equally...

    Started by bekmonster‎, 01-19-2017 10:41 PM
    conditional probability
    • Replies: 3
    • Views: 1,261
    01-22-2017, 02:49 PM Go to last post
  59. Probability advice for a rpg

    Hello everyone ! The question I have will look a lot like a math problem, and I have to say, if I was a lath teacher, I would use problems like...

    Started by Yorkblack‎, 01-21-2017 10:23 PM
    • Replies: 0
    • Views: 718
    01-21-2017, 10:23 PM Go to last post
  60. For the following example, is order meaningful or not?

    Consider a hypothetical example. There are 12 tickets for a documentary film and exactly 12 people to buy the tickets (one person can buy only one...

    Started by user1234‎, 01-19-2017 10:24 PM
    combination, combinatorics, permutation, probability
    • Replies: 0
    • Views: 661
    01-19-2017, 10:24 PM Go to last post

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