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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: 16,098
    09-30-2005, 09:44 AM Go to last post
  1. Two dice are thrown simultaneously

    Two dice are thrown simultaneously. 1.Find the probability of getting an odd number on the one and a multiple of three on the other. 2.what is the...

    Started by shamsu kano‎, 06-25-2016 06:16 PM
    • Replies: 2
    • Views: 128
    Yesterday, 11:19 AM Go to last post
  2. Please help!!!

    A group of telephone subscribers is observed continuously during a 80-minute busy hour period. During this time, they make 30 calls, with the total...

    Started by sreenivasan‎, 06-20-2016 08:47 AM
    • Replies: 1
    • Views: 192
    06-20-2016, 08:48 AM Go to last post
  3. distributing labeled balls in unlabel! Statistics for Biological problem,help needed?

    Hello everyone, I am a biology student and i am stuck with a problem, hence here. I have a large number of 10 different kinds of viruses in a tube...

    Started by fz2life‎, 06-17-2016 09:04 PM
    virus_infection_biology
    • Replies: 1
    • Views: 210
    06-20-2016, 03:20 AM Go to last post
  4. Binomial distribution and rolling dice

    I realized this was the homework forum and reposted it in general discussion since mine is not homework.

    Started by XBear‎, 06-17-2016 03:26 PM
    • Replies: 0
    • Views: 100
    06-17-2016, 03:26 PM Go to last post
  5. Probability distribution on next draw from random variable

    I'm working on a game theory model of incomplete information, where players observe certain attributes via noisy signals. I am looking to solve for...

    Started by sundance‎, 02-03-2016 12:45 AM
    • Replies: 1
    • Views: 52
    06-17-2016, 11:55 AM Go to last post
  6. Interpreting the limiting distribution of markov chains?

    Hi all, I have a few questions on the interpretation and application of the steady state or limiting distribution for a markov chain transition...

    Started by Keroro‎, 06-16-2016 07:16 PM
    • Replies: 0
    • Views: 468
    06-16-2016, 07:16 PM Go to last post
  7. Super Bowl Pool Probability Question

    Hey we were trying (and failing) to calculate the odds of winning our super bowl pool at least twice based on the below info: There are 100...

    Started by Probs321‎, 02-12-2016 01:32 AM
    • Replies: 1
    • Views: 271
    06-16-2016, 01:59 PM Go to last post
  8. Obtaining Probability for costs above a certain threshold

    Dear all, I never sought for help on a forum since I feel that many times the answer for a problem can be found if one reads books and searches...

    Started by rashidjelzin‎, 06-09-2016 07:23 AM
    • Replies: 4
    • Views: 254
    06-15-2016, 10:43 AM Go to last post
  9. Paper Notes in a Bag

    Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit...

    Started by Yankel‎, 06-15-2016 12:31 AM
    • Replies: 5
    • Views: 171
    06-15-2016, 06:47 AM Go to last post
  10. Hypergeometric problem

    Hello all, I have some problems with this question. Can you assist ? Thanks ! In a cellar there are 3 bottles of wine which are 18 years old, 4...

    Started by Yankel‎, 06-14-2016 03:13 PM
    • Replies: 1
    • Views: 137
    06-14-2016, 04:12 PM Go to last post
  11. Risk Analysis questions

    Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

    Started by AndreT‎, 06-10-2016 03:02 PM
    • Replies: 0
    • Views: 183
    06-10-2016, 03:02 PM Go to last post
  12. Calculating Expected Value of a Continuous Random Variable

    Hell all, I have this distribution function of a random variable X. I wish to find E(X). I have used derivatives to get the density...

    Started by Yankel‎, 06-10-2016 06:41 AM
    • Replies: 1
    • Views: 173
    06-10-2016, 10:58 AM Go to last post
  13. Probability Distribution and Time?

    I saw the attached chart on an optionetics video on youtube and I'm struggling to understand it properly. It's a probability distribution placed...

    Started by tomydom‎, 05-26-2016 08:14 AM
    • Replies: 8
    • Views: 588
    06-09-2016, 11:24 PM Go to last post
  14. Exam tomorrow, urgent help needed.

    Hello, first, im a bulgarian student, my exam is in bulgarian and i translated it to english via google translate, if its not understandable but you...

    Started by skgmdz‎, 06-09-2016 02:55 PM
    • Replies: 1
    • Views: 138
    06-09-2016, 03:27 PM Go to last post
  15. Business Predictability Scheduling Dilemma

    Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

    Started by jprice33‎, 06-08-2016 09:57 AM
    • Replies: 0
    • Views: 134
    06-08-2016, 09:57 AM Go to last post
  16. Help for an exercise please!

    Hello! I am very confused about something. I am using a software for the reaction time, I have a distribution, mean and standard deviation. and 2...

    Started by itro82‎, 06-04-2016 07:36 AM
    • Replies: 4
    • Views: 295
    06-04-2016, 11:55 PM Go to last post
  17. Joint Density Function From Given Correlation

    How do I find joint density function from a given correlation?

    Started by Vinnie Sappingfield‎, 06-02-2016 09:38 AM
    correlation, joint density function, probabilty
    • Replies: 1
    • Views: 154
    06-02-2016, 01:14 PM Go to last post
  18. Interpretation of likelihood ratio and hypothesis testing

    Even after extensive search, am unclear on some (basic) concepts regarding likelihood vs. frequentist approach in hypothesis testing. Can you...

    Started by natajax‎, 06-02-2016 03:08 AM
    likelihood, likelihood ratio
    • Replies: 0
    • Views: 103
    06-02-2016, 03:08 AM Go to last post
  19. calculating $E(Y)$

    suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

    Started by hadiSanji‎, 05-31-2016 01:11 PM
    probability
    • Replies: 1
    • Views: 160
    05-31-2016, 01:56 PM Go to last post
  20. Probability Problem - Random variable

    A company wants to improve waste management in its premises . We put a yellow bin for recovering recyclable materials , a brown to recover...

    Started by lalous‎, 05-25-2016 01:03 AM
    • Replies: 5
    • Views: 286
    05-26-2016, 01:41 AM Go to last post
  21. Question Hypothesis test of sample (yes/no) and proportions

    Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

    Started by BioEngineer‎, 05-25-2016 06:06 PM
    • Replies: 0
    • Views: 128
    05-25-2016, 06:06 PM Go to last post
  22. Probability problem - no idea where to start

    Sorry - my question was poorly written.

    Started by gdsquare‎, 05-25-2016 05:27 PM
    • Replies: 0
    • Views: 125
    05-25-2016, 05:27 PM Go to last post
  23. How to calculate probability of two samples

    Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

    Started by ANCOVA'D‎, 05-25-2016 11:25 AM
    probability
    • Replies: 0
    • Views: 136
    05-25-2016, 11:25 AM Go to last post
  24. Probability problem - descrete Random variable

    post deleted...

    Started by lalous‎, 05-25-2016 08:32 AM
    random variable
    • Replies: 0
    • Views: 108
    05-25-2016, 08:32 AM Go to last post
  25. Is the order of an event occurs in a sequences of events random?

    I am interested in knowing how to analyse whether the order in which an event occurs within a sequence of events is random; i.e. is the likelihood of...

    Started by Jack Thorley‎, 05-25-2016 06:20 AM
    permutation test, randomisation, sequence data
    • Replies: 0
    • Views: 79
    05-25-2016, 06:20 AM Go to last post
  26. Easy Coin Flip Problem ???

    Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

    Started by fergferg‎, 05-15-2016 05:43 PM
    • Replies: 7
    • Views: 482
    05-18-2016, 01:54 PM Go to last post
  27. Roll a Dice (1)

    1. Between two games offered to you, would you rather (i) roll a die once and get paid $1 million for each dot on the upturned face, or (ii) roll a...

    Started by salman123491‎, 05-17-2016 05:28 PM
    • Replies: 1
    • Views: 234
    05-17-2016, 08:21 PM Go to last post
  28. Roll 2 Dice (2)

    2. If you roll 2 fair dice and add the points on each of the upturned face, what is the most likely sum? What is the probability of getting this sum?...

    Started by salman123491‎, 05-17-2016 05:32 PM
    • Replies: 0
    • Views: 150
    05-17-2016, 05:32 PM Go to last post
  29. Probability question

    A teacher says 40% of students study for a specific test. If she randomly selects 5 students, whats the probability that 3 studends did not study for...

    Started by Dnnup‎, 05-16-2016 01:23 PM
    • Replies: 2
    • Views: 179
    05-17-2016, 08:43 AM Go to last post
  30. Question Differences of proportions

    Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are...

    Started by WhiskeyJack‎, 05-16-2016 08:52 AM
    • Replies: 0
    • Views: 129
    05-16-2016, 08:52 AM Go to last post
  31. Hotel overbooking task

    Hello together, I am a bit lost with this problem that I need to answer for a university project and I hope someone is able to help me solving...

    Started by SteveF‎, 05-15-2016 09:43 AM
    • Replies: 1
    • Views: 124
    05-15-2016, 03:13 PM Go to last post
  32. should bayes therom be used?

    Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

    Started by auditor‎, 04-27-2016 09:31 PM
    • Replies: 2
    • Views: 234
    05-15-2016, 06:41 AM Go to last post
  33. Conditional probability of functions. Small question

    Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

    Started by andreme91‎, 05-12-2016 06:29 AM
    conditional probability, probability
    • Replies: 0
    • Views: 153
    05-12-2016, 06:29 AM Go to last post
  34. Moments of a random variable involving numerous Binomial Distributions

    I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

    Started by BobbyRichards‎, 05-06-2016 03:42 PM
    binomial distributions, moments
    • Replies: 6
    • Views: 386
    05-10-2016, 10:59 AM Go to last post
  35. Question Challenge: Card drawing probability

    Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine...

    Started by leon_m‎, 05-03-2016 08:59 AM
    • Replies: 4
    • Views: 292
    05-10-2016, 06:32 AM Go to last post
  36. Exclamation Determine the risk (probability) of meeting forecasted demand

    Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

    Started by wbez0601‎, 05-07-2016 07:34 AM
    monte carlo, probability, stochastic modeling
    • Replies: 1
    • Views: 205
    05-08-2016, 02:03 PM Go to last post
  37. Smile Bayesian Approach To Combine Multiple Weighted Inputs

    I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

    Started by cmarin‎, 05-07-2016 06:16 PM
    bayesian inference
    • Replies: 2
    • Views: 236
    05-08-2016, 10:59 AM Go to last post
  38. Wink logistic regression+test of hypothesis

    Hello guys! I need your advice. I have done a logistic regression to estimate a probability of impaiment occurs or not. My indep.variables were...

    Started by Lisa92‎, 05-06-2016 04:56 PM
    log, log binomial regression
    • Replies: 2
    • Views: 180
    05-07-2016, 02:21 AM Go to last post
  39. Markov limit expectation

    I need to find a limit involving a discrete finite state markov chain with absorbing state. It is given that: q(x,c) = r(x) + \beta E_{c'\lvert...

    Started by JesperHP‎, 05-06-2016 10:43 AM
    • Replies: 0
    • Views: 118
    05-06-2016, 10:43 AM Go to last post
  40. Profit function given probabilities

    I have completed part a) and b) But I can't seem to get any further with part c) in order to be able to answer part d)

    Started by k.dot‎, 05-02-2016 10:40 PM
    • Replies: 1
    • Views: 186
    05-03-2016, 02:31 AM Go to last post
  41. Number of Positives

    Hi, If I have 128 samples and each sample has a 0.25 probability of being positive, what is the probability that I will have at least 24...

    Started by Gilthoniel‎, 05-02-2016 04:53 PM
    • Replies: 1
    • Views: 156
    05-02-2016, 10:01 PM Go to last post
  42. Probability question

    I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

    Started by sunragav‎, 04-27-2016 02:07 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 601
    05-02-2016, 06:58 AM Go to last post
  43. deriving the pmf

    I don't fully understand how to answer part b. Is it asking me to use transformation techniques of the poisson derived in part a? If so, how do i go...

    Started by k.dot‎, 05-01-2016 10:25 PM
    • Replies: 2
    • Views: 185
    05-02-2016, 05:26 AM Go to last post
  44. Dice probability question

    What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

    Started by CBOR‎, 04-30-2016 12:34 PM
    dice, probability
    • Replies: 1
    • Views: 209
    04-30-2016, 01:36 PM Go to last post
  45. The random variable and Probability. 2 problems

    Hi, can anyone help me out with these 2 problems? Sorry for language mistakes, translated from German.

    Started by kagokina88‎, 04-30-2016 05:26 AM
    • Replies: 1
    • Views: 160
    04-30-2016, 11:52 AM Go to last post
  46. Probability Of insurance sales

    Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

    Started by semidevil‎, 04-21-2016 12:38 PM
    • Replies: 7
    • Views: 481
    04-26-2016, 02:50 PM Go to last post
  47. Normal distribution

    Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the...

    Started by Evyatar‎, 04-25-2016 09:10 AM
    mean 1, normal distribution, random, sigma, std
    • Replies: 2
    • Views: 201
    04-26-2016, 01:31 AM Go to last post
  48. Geometric Mean and SD into Normal Curve

    Hi I'm working with a data set of historical return on a particular investment. I have 556 consecutive monthly price values, and i used those to...

    Started by superfro123‎, 04-25-2016 09:38 AM
    • Replies: 0
    • Views: 137
    04-25-2016, 09:38 AM Go to last post
  49. Probability of having "Best Qualified" applicants in a subset of the entire pool

    Probability of having "Best Qualified" applicants in a subset of the entire pool. I am working on an issue, trying to show whether or not an HR...

    Started by Smangold‎, 04-25-2016 12:47 AM
    • Replies: 0
    • Views: 161
    04-25-2016, 12:47 AM Go to last post
  50. Not understanding the posterior distribution result

    So I cam across this question http://pages.pomona.edu/~jsh04747/courses/math152/wu2_f07.pdf I understand majority of it, except the line ξ(θ|x). I...

    Started by k.dot‎, 04-22-2016 07:31 PM
    • Replies: 1
    • Views: 211
    04-22-2016, 08:56 PM Go to last post
  51. Post a low correlation and a strong significance = can the null hypothesis be rejected?

    I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

    Started by emma13‎, 04-21-2016 10:42 AM
    pseudo-replication
    • Replies: 7
    • Views: 442
    04-22-2016, 09:07 AM Go to last post
  52. Engineering Failure Analysis

    I'm currently writing a report in which I would like to discuss the potential for failure of several pipelines. If the chance of failure per pipeline...

    Started by eschertz‎, 04-20-2016 02:27 PM
    • Replies: 1
    • Views: 191
    04-20-2016, 02:58 PM Go to last post
  53. synthetic data (poisson)

    Hello I'm trying to get a grip of generating synthetic data but I'm having some difficulties ? Following Hilbe2010...

    Started by oharman‎, 04-19-2016 05:57 AM
    • Replies: 0
    • Views: 213
    04-19-2016, 05:57 AM Go to last post
  54. Question Compound Distribution Hyper-Parameters

    Hi, If a compound distribution is made up of a gamma dist with parameters (a,b), and b is gamma-distributed so that its parameters are (c,d), such...

    Started by Snow64‎, 04-17-2016 06:42 PM
    distribution function, likelihhod function., optimization
    • Replies: 1
    • Views: 250
    04-18-2016, 01:57 AM Go to last post
  55. Sampling with replacement - probability problem

    Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of...

    Started by Bep75‎, 04-15-2016 01:06 PM
    • Replies: 6
    • Views: 388
    04-17-2016, 03:02 PM Go to last post
  56. Express similarity measure in terms of probability

    Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of...

    Started by aryabhatta‎, 04-15-2016 05:58 PM
    • Replies: 0
    • Views: 233
    04-15-2016, 05:58 PM Go to last post
  57. conditional probability question

    I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed...

    Started by Alex C‎, 04-15-2016 10:28 AM
    • Replies: 0
    • Views: 158
    04-15-2016, 10:28 AM Go to last post
  58. Advantages of having population-defined parameters?

    Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk...

    Started by spunky‎, 04-14-2016 03:06 PM
    • Replies: 1
    • Views: 213
    04-14-2016, 06:06 PM Go to last post
  59. How do I test binomial data?

    Good Afternoon, I have what I assume will be an easy question for all those more statistically minded than myself. Say I have done an...

    Started by SiobhanRoisin‎, 04-14-2016 09:09 AM
    • Replies: 2
    • Views: 207
    04-14-2016, 02:23 PM Go to last post
  60. Probability of getting a certain card game hand combo

    Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ...

    Started by dctrombly‎, 04-13-2016 11:31 PM
    • Replies: 0
    • Views: 193
    04-13-2016, 11:31 PM Go to last post

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