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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: 24,534
    09-30-2005, 09:44 AM Go to last post
  1. Exclamation Minimum CDF of non-independent random variables

    How can I find the CDF for F_{X,Y}={x,x} if X,Y are not-independent. In other words, what will be Pr{min(X,Y)<x} if X,Y are not-independent? If I...

    Started by ghizall4‎, Yesterday 07:20 PM
    cdf, dependent, joint distribution, proability
    • Replies: 0
    • Views: 41
    Yesterday, 07:20 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: 6
    • Views: 210
    Yesterday, 10:38 AM Go to last post
  3. Minimum CDF of non-independent random variables

    How can I find the CDF for F_{X,Y}={x,x} if X,Y are not-independent. In other words, what will be Pr{min(X,Y)<x} if X,Y are not-independent? If I...

    Started by ghizall4‎, Yesterday 03:45 AM
    cdf, distributions, joint-distribution, probability, random-variable
    • Replies: 0
    • Views: 19
    Yesterday, 03:45 AM Go to last post
  4. conjoint analysis

    Hi how i can ask for which situation to use conjoint analysis?

    Started by Kimudao‎, 05-27-2017 11:45 PM
    • Replies: 0
    • Views: 78
    05-27-2017, 11:45 PM Go to last post
  5. decile

    hi experts. I 'd like to ask about cluster analysis. to identify the group of customer that which group will have high potential to cancel the...

    Started by Kimudao‎, 05-27-2017 11:34 PM
    • Replies: 0
    • Views: 49
    05-27-2017, 11:34 PM Go to last post
  6. 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, 05-26-2017 05:37 PM
    • Replies: 2
    • Views: 136
    05-27-2017, 09:30 PM Go to last post
  7. 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: 294
    05-20-2017, 04:20 AM Go to last post
  8. 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: 397
    05-11-2017, 03:32 AM Go to last post
  9. 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: 273
    05-09-2017, 11:34 PM Go to last post
  10. 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: 697
    04-30-2017, 04:26 AM Go to last post
  11. 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: 438
    04-28-2017, 06:10 PM Go to last post
  12. 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: 432
    04-27-2017, 10:10 PM Go to last post
  13. 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: 373
    04-27-2017, 05:38 PM Go to last post
  14. 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: 4,691
    04-18-2017, 03:10 PM Go to last post
  15. 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: 404
    04-18-2017, 02:38 PM Go to last post
  16. 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: 273
    04-18-2017, 09:53 AM Go to last post
  17. [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: 324
    04-18-2017, 09:18 AM Go to last post
  18. 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: 298
    04-16-2017, 06:49 PM Go to last post
  19. 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: 241
    04-16-2017, 05:23 PM Go to last post
  20. 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: 990
    03-30-2017, 04:11 PM Go to last post
  21. 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: 500
    03-30-2017, 03:42 PM Go to last post
  22. 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: 402
    03-30-2017, 02:06 PM Go to last post
  23. 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: 292
    03-30-2017, 11:58 AM Go to last post
  24. 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: 393
    03-29-2017, 06:59 AM Go to last post
  25. 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: 745
    03-24-2017, 09:11 AM Go to last post
  26. 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: 525
    03-23-2017, 10:38 AM Go to last post
  27. 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: 500
    03-19-2017, 02:51 PM Go to last post
  28. 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: 830
    03-18-2017, 06:05 PM Go to last post
  29. 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: 718
    03-13-2017, 06:02 PM Go to last post
  30. 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: 760
    03-09-2017, 04:09 PM Go to last post
  31. 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: 770
    03-07-2017, 10:33 PM Go to last post
  32. 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: 867
    03-04-2017, 12:06 AM Go to last post
  33. 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: 639
    03-03-2017, 05:02 PM Go to last post
  34. 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: 823
    03-02-2017, 05:06 PM Go to last post
  35. 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: 771
    03-02-2017, 04:20 AM Go to last post
  36. 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: 1,078
    03-02-2017, 04:06 AM Go to last post
  37. 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: 649
    03-01-2017, 06:30 PM Go to last post
  38. 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: 904
    02-23-2017, 06:05 PM Go to last post
  39. 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: 1,071
    02-23-2017, 03:33 PM Go to last post
  40. 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: 944
    02-23-2017, 01:00 AM Go to last post
  41. 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: 620
    02-21-2017, 02:47 AM Go to last post
  42. 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: 558
    02-20-2017, 11:03 PM Go to last post
  43. 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: 837
    02-18-2017, 08:54 PM Go to last post
  44. 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: 615
    02-17-2017, 03:41 PM Go to last post
  45. 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: 758
    02-16-2017, 07:25 PM Go to last post
  46. 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: 858
    02-15-2017, 11:08 PM Go to last post
  47. 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: 1,070
    02-14-2017, 08:26 PM Go to last post
  48. 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: 734
    02-13-2017, 07:27 AM Go to last post
  49. probability

    probability

    Started by asonibareoyindamola‎, 02-10-2017 07:49 PM
    • Replies: 1
    • Views: 827
    02-10-2017, 08:03 PM Go to last post
  50. 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: 767
    02-10-2017, 08:02 PM Go to last post
  51. 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: 697
    02-09-2017, 05:43 AM Go to last post
  52. 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: 1,590
    02-08-2017, 10:28 PM Go to last post
  53. 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: 477
    02-08-2017, 09:33 PM Go to last post
  54. Question Probability problem help

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

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 761
    02-05-2017, 12:59 PM Go to last post
  55. 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: 1,870
    02-03-2017, 04:06 PM Go to last post
  56. 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: 1,267
    02-02-2017, 11:48 AM Go to last post
  57. 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: 1,023
    02-02-2017, 01:52 AM Go to last post
  58. 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: 730
    01-30-2017, 01:34 PM Go to last post
  59. 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: 936
    01-29-2017, 09:55 PM Go to last post
  60. 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: 862
    01-29-2017, 08:56 PM Go to last post

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