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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: 31,138
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,141
    05-31-2016, 01:56 PM Go to last post
  2. 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: 1,588
    05-26-2016, 01:41 AM Go to last post
  3. 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: 1,682
    05-25-2016, 06:06 PM Go to last post
  4. 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: 1,123
    05-25-2016, 05:27 PM Go to last post
  5. 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: 1,768
    05-25-2016, 11:25 AM Go to last post
  6. Probability problem - descrete Random variable

    post deleted...

    Started by lalous‎, 05-25-2016 08:32 AM
    random variable
    • Replies: 0
    • Views: 1,376
    05-25-2016, 08:32 AM Go to last post
  7. 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: 762
    05-25-2016, 06:20 AM Go to last post
  8. 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: 2,108
    05-18-2016, 01:54 PM Go to last post
  9. 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: 2,002
    05-17-2016, 08:21 PM Go to last post
  10. 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: 1,847
    05-17-2016, 05:32 PM Go to last post
  11. 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: 1,428
    05-17-2016, 08:43 AM Go to last post
  12. 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: 1,687
    05-16-2016, 08:52 AM Go to last post
  13. 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: 1,967
    05-15-2016, 03:13 PM Go to last post
  14. 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: 1,340
    05-15-2016, 06:41 AM Go to last post
  15. 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: 1,008
    05-12-2016, 06:29 AM Go to last post
  16. 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: 1,449
    05-10-2016, 10:59 AM Go to last post
  17. 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: 1,662
    05-10-2016, 06:32 AM Go to last post
  18. 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: 2,590
    05-08-2016, 02:03 PM Go to last post
  19. 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: 1,306
    05-08-2016, 10:59 AM Go to last post
  20. 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: 2,130
    05-07-2016, 02:21 AM Go to last post
  21. 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: 930
    05-06-2016, 10:43 AM Go to last post
  22. 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: 1,146
    05-03-2016, 02:31 AM Go to last post
  23. 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: 1,112
    05-02-2016, 10:01 PM Go to last post
  24. 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: 3,623
    05-02-2016, 06:58 AM Go to last post
  25. 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: 1,350
    05-02-2016, 05:26 AM Go to last post
  26. 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: 1,169
    04-30-2016, 01:36 PM Go to last post
  27. 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: 1,485
    04-30-2016, 11:52 AM Go to last post
  28. 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: 1,869
    04-26-2016, 02:50 PM Go to last post
  29. 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: 1,259
    04-26-2016, 01:31 AM Go to last post
  30. 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: 4,773
    04-25-2016, 09:38 AM Go to last post
  31. 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: 930
    04-25-2016, 12:47 AM Go to last post
  32. 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: 1,098
    04-22-2016, 08:56 PM Go to last post
  33. 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: 1,571
    04-22-2016, 09:07 AM Go to last post
  34. 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: 1,225
    04-20-2016, 02:58 PM Go to last post
  35. 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: 1,666
    04-19-2016, 05:57 AM Go to last post
  36. 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: 1,491
    04-18-2016, 01:57 AM Go to last post
  37. 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: 2,325
    04-17-2016, 03:02 PM Go to last post
  38. 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: 1,456
    04-15-2016, 05:58 PM Go to last post
  39. 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: 1,210
    04-15-2016, 10:28 AM Go to last post
  40. 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: 1,313
    04-14-2016, 06:06 PM Go to last post
  41. 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: 2,269
    04-14-2016, 02:23 PM Go to last post
  42. 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: 955
    04-13-2016, 11:31 PM Go to last post
  43. Probability and Efficiency

    I have a probability question I am looking for some help with. In the scenario I perform a task on an object. I will either succeed or fail....

    Started by braeden‎, 04-13-2016 10:31 AM
    • Replies: 0
    • Views: 1,290
    04-13-2016, 10:31 AM Go to last post
  44. Lightbulb Have the mean, standard deviation and probability...but something seems off!

    hi all! So I am taking a Quantitative methods class for my MBA and we are just getting started, so I am somewhat overwhelmed. I am taking the...

    Started by sophie0816‎, 04-10-2016 07:51 PM
    • Replies: 1
    • Views: 3,969
    04-11-2016, 06:19 AM Go to last post
  45. Find E(X) and VAR (X)

    Question is: There is one error in one of five blocks of program. To find the error, we test three randomly selected blocks. Let X be the number of...

    Started by smske‎, 01-15-2012 08:21 AM
    • Replies: 10
    • Views: 27,645
    04-10-2016, 03:54 AM Go to last post
  46. Basic Probability Question

    Hi, could anyone point out the methodology I should use the answer the question below? Your wisdom is much appreciated! Question: "Between...

    Started by ShareTheGlobe‎, 04-10-2016 03:31 AM
    • Replies: 0
    • Views: 1,929
    04-10-2016, 03:31 AM Go to last post
  47. Another game designer dice question...

    Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

    Started by hazard‎, 03-08-2016 10:20 PM
    • Replies: 9
    • Views: 2,854
    04-09-2016, 09:53 AM Go to last post
  48. Unhappy Hypothesis Testing with proportions

    Calculate and interpret the Z-scores to test significant difference between the proportion of rates of dementia between a. 30-49 year-old US men...

    Started by delaney‎, 04-07-2016 04:30 PM
    • Replies: 0
    • Views: 1,355
    04-07-2016, 04:30 PM Go to last post
  49. Markov hitprobabilities

    Hey I have to find the equilibrium path in a dynamic directed stochastic game. The equilibrium path are the set of state space points with positive...

    Started by JesperHP‎, 04-07-2016 02:30 PM
    • Replies: 0
    • Views: 971
    04-07-2016, 02:30 PM Go to last post
  50. Coin flip explanation

    Hi, I have been wondering about a probability question. Suppose you have a 50% chance of winning $1 when you flip a coin. You also have a 50%...

    Started by numbersman‎, 04-06-2016 02:50 AM
    • Replies: 1
    • Views: 1,290
    04-06-2016, 04:07 AM Go to last post
  51. Probability

    Hello! I will appreciate if anyone can help me with this problem. Thank you!:) 40% of vacationers going to rocky mt. region visit yellowstone...

    Started by LadyBoss77‎, 03-30-2016 03:41 AM
    • Replies: 2
    • Views: 1,872
    03-31-2016, 11:26 PM Go to last post
  52. Probability question

    Out of 12 people in a room, what is the probability that no 2 different people has birthday at the same month?

    Started by Eyal8‎, 03-23-2016 04:20 PM
    • Replies: 1
    • Views: 1,768
    03-23-2016, 04:24 PM Go to last post
  53. bayes's theorem and conditional probability question

    chat **** get banged

    Started by shazooby‎, 03-22-2016 10:51 AM
    bayes' theorem, conditional probabilities, probability
    • Replies: 2
    • Views: 1,970
    03-23-2016, 01:43 PM Go to last post
  54. Dice probability with limited reroll

    Hello, I'm having difficulty understanding this problem and I was wondering if someone had an answer. Let n = \text{Number of dice} = 3 p_s...

    Started by Dan K‎, 03-20-2016 06:26 PM
    dice, probability
    • Replies: 2
    • Views: 1,750
    03-23-2016, 12:13 PM Go to last post
  55. Show, by calculation, that the mean of y doesn't exist

    This is one of my questions for my homework, I have attached a copy of the function and also my attempt, I'm not sure if I've done it right. And if I...

    Started by k.dot‎, 03-20-2016 07:08 AM
    • Replies: 5
    • Views: 1,661
    03-21-2016, 07:35 PM Go to last post
  56. Need help with some Statistics Questions

    In a certain population, 18% of the people have Rh-negative blood. A blood bank serving this population receives 95 blood donors on a particular day....

    Started by surajthemighty‎, 03-13-2016 11:50 PM
    • Replies: 1
    • Views: 3,497
    03-21-2016, 04:55 PM Go to last post
  57. Post statistics and probability question

    Winnipeg has three professional sports teams - the Winnipeg Jets hockey team, the Winnipeg Blue Bombers football team and the Winnipeg Goldeyes...

    Started by rsniper007‎, 03-17-2016 08:10 PM
    #statistics
    • Replies: 1
    • Views: 2,126
    03-17-2016, 08:12 PM Go to last post
  58. Question What is the probability of this improbable event?

    Hello all, Let's suppose that we are given 6 chances to draw for two specific numbers. (Though perhaps that 6 chances doesn't really matter?) Let's...

    Started by Kp83‎, 03-16-2016 09:18 PM
    • Replies: 1
    • Views: 1,820
    03-17-2016, 09:40 AM Go to last post
  59. Conditional probability

    I am consideriing the following identities: p(s' \lvert s,a) = p(x'_1,x'_2,c' \lvert x_1,x_2,c,a_1,a_2) = \pi(c'\lvert c)p(x'_2 \lvert...

    Started by JesperHP‎, 03-16-2016 06:14 PM
    • Replies: 0
    • Views: 1,576
    03-16-2016, 06:14 PM Go to last post
  60. Special Multiplication Rule

    Hey I was reading some basic probability problems from my Intro Stats book and thought of a problem to test if I understand it correctly. ...

    Started by StilloftheNight‎, 03-16-2016 02:10 AM
    • Replies: 0
    • Views: 1,556
    03-16-2016, 02:10 AM Go to last post

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