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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: 16,351
    09-30-2005, 09:44 AM Go to last post
  1. Poisson Distribution - Optimisation

    A store offers a new seasonal product featured. Let N be the random variable which means the number of clients who come to the store during the...

    Started by lalous‎, 07-18-2016 07:43 PM
    • Replies: 1
    • Views: 128
    Yesterday, 05:14 PM Go to last post
  2. Probability calculation on 2 similar vases with difference in time and backlog

    Hi all, Below is a problem that we find hard to solve, any input would be much appreciated. In short, we're looking for the exact probability...

    Started by McStat‎, 07-21-2016 07:34 AM
    vases time backlog markov
    • Replies: 0
    • Views: 136
    07-21-2016, 07:34 AM Go to last post
  3. Calculating Probabilities

    If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault...

    Started by Rab1‎, 07-09-2016 06:23 AM
    • Replies: 5
    • Views: 252
    07-20-2016, 12:59 PM Go to last post
  4. Mean and Variance - conditional probability

    A public electricity supplier has a number of facilities numbered from 1 to 19. We suppose that for i = 1, 2,..., 19 , installation i produces...

    Started by lalous‎, 07-18-2016 02:00 PM
    • Replies: 0
    • Views: 105
    07-18-2016, 02:00 PM Go to last post
  5. Uniform Distribution / Normal Distribution

    Let the random variable X ~ U ( 0, k ) and Y is a second random variable such as Y | X ~ N ( X , 1). a) Determine the Y density function if k = A ....

    Started by lalous‎, 07-18-2016 10:48 AM
    • Replies: 0
    • Views: 84
    07-18-2016, 10:48 AM Go to last post
  6. Confirmation bias.

    Hello. I am interested in confirmation bias. Specifically I am interested in when a hypotheses can be said to be no longer confirmation bias. ...

    Started by Frankfranky‎, 07-15-2016 06:12 AM
    • Replies: 4
    • Views: 204
    07-15-2016, 08:57 AM Go to last post
  7. Unhappy Conditional Probability - Exam

    Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

    Started by begacon‎, 07-28-2007 07:10 PM
    • Replies: 2
    • Views: 19,461
    07-13-2016, 01:00 AM Go to last post
  8. Hypergeometric problem

    Hello everybody! :D I'm new to statistics and I'm struggling with a hypergeometric problem: Suppose I have a drawer with 100 socks in different...

    Started by MindBoggle‎, 07-09-2016 10:54 PM
    hypergeometric
    • Replies: 2
    • Views: 234
    07-10-2016, 01:18 PM Go to last post
  9. Medals at the Olympics

    Hi, I love sports and stats and so I am doing my Olympics research. I saw that there are 2 players from China's on each Badminton competition (MS,...

    Started by Dedes‎, 07-05-2016 04:34 AM
    combinations, olympics, probabilities, sports
    • Replies: 0
    • Views: 252
    07-05-2016, 04:34 AM Go to last post
  10. Probability Problem To Resolve

    Hi, I need the solution to this problem to be able to resolve a situation at work. I believe some probability equation must be involved. ...

    Started by kevin66‎, 06-30-2016 04:19 PM
    • Replies: 2
    • Views: 363
    06-30-2016, 05:12 PM Go to last post
  11. Is this right?

    I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

    Started by datorres85‎, 06-28-2016 08:38 PM
    • Replies: 1
    • Views: 206
    06-30-2016, 02:31 PM Go to last post
  12. What is chance performance cut-off for a 2-part dichotomous response?

    If subjects had to give 2-alternative forced choice responses for a task (Y/N) and then rate the certainty of their response (also 2-alternative...

    Started by ginaj‎, 06-30-2016 04:57 AM
    binomial test, chance level, chance performance
    • Replies: 1
    • Views: 138
    06-30-2016, 02:02 PM Go to last post
  13. New to probability

    Can someone help me solve the following P(0.55≤ z ≤ 1.28). How does one determine a left side vs right side table?

    Started by Cdoss‎, 06-28-2016 09:39 PM
    • Replies: 1
    • Views: 209
    06-29-2016, 12:01 AM Go to last post
  14. 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: 265
    06-26-2016, 11:19 AM Go to last post
  15. 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: 296
    06-20-2016, 08:48 AM Go to last post
  16. 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: 272
    06-20-2016, 03:20 AM Go to last post
  17. 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: 157
    06-17-2016, 03:26 PM Go to last post
  18. 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: 105
    06-17-2016, 11:55 AM Go to last post
  19. 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: 511
    06-16-2016, 07:16 PM Go to last post
  20. 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: 314
    06-16-2016, 01:59 PM Go to last post
  21. 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: 331
    06-15-2016, 10:43 AM Go to last post
  22. 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: 232
    06-15-2016, 06:47 AM Go to last post
  23. 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: 252
    06-14-2016, 04:12 PM Go to last post
  24. 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: 243
    06-10-2016, 03:02 PM Go to last post
  25. 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: 284
    06-10-2016, 10:58 AM Go to last post
  26. 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: 670
    06-09-2016, 11:24 PM Go to last post
  27. 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: 190
    06-09-2016, 03:27 PM Go to last post
  28. 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: 169
    06-08-2016, 09:57 AM Go to last post
  29. 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: 340
    06-04-2016, 11:55 PM Go to last post
  30. 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: 190
    06-02-2016, 01:14 PM Go to last post
  31. 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: 134
    06-02-2016, 03:08 AM Go to last post
  32. 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: 200
    05-31-2016, 01:56 PM Go to last post
  33. 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: 348
    05-26-2016, 01:41 AM Go to last post
  34. 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: 165
    05-25-2016, 06:06 PM Go to last post
  35. 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: 160
    05-25-2016, 05:27 PM Go to last post
  36. 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: 165
    05-25-2016, 11:25 AM Go to last post
  37. Probability problem - descrete Random variable

    post deleted...

    Started by lalous‎, 05-25-2016 08:32 AM
    random variable
    • Replies: 0
    • Views: 138
    05-25-2016, 08:32 AM Go to last post
  38. 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: 112
    05-25-2016, 06:20 AM Go to last post
  39. 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: 535
    05-18-2016, 01:54 PM Go to last post
  40. 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: 265
    05-17-2016, 08:21 PM Go to last post
  41. 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: 176
    05-17-2016, 05:32 PM Go to last post
  42. 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: 215
    05-17-2016, 08:43 AM Go to last post
  43. 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: 163
    05-16-2016, 08:52 AM Go to last post
  44. 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: 161
    05-15-2016, 03:13 PM Go to last post
  45. 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: 263
    05-15-2016, 06:41 AM Go to last post
  46. 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: 182
    05-12-2016, 06:29 AM Go to last post
  47. 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: 429
    05-10-2016, 10:59 AM Go to last post
  48. 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: 323
    05-10-2016, 06:32 AM Go to last post
  49. 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: 245
    05-08-2016, 02:03 PM Go to last post
  50. 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: 267
    05-08-2016, 10:59 AM Go to last post
  51. 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: 216
    05-07-2016, 02:21 AM Go to last post
  52. 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: 152
    05-06-2016, 10:43 AM Go to last post
  53. 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: 215
    05-03-2016, 02:31 AM Go to last post
  54. 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: 182
    05-02-2016, 10:01 PM Go to last post
  55. 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: 682
    05-02-2016, 06:58 AM Go to last post
  56. 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: 223
    05-02-2016, 05:26 AM Go to last post
  57. 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: 243
    04-30-2016, 01:36 PM Go to last post
  58. 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: 184
    04-30-2016, 11:52 AM Go to last post
  59. 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: 543
    04-26-2016, 02:50 PM Go to last post
  60. 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: 239
    04-26-2016, 01:31 AM Go to last post

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