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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: 13,043
    09-30-2005, 09:44 AM Go to last post
  1. Noob question about "combined" probabilities.

    Hello! Sorry for my poor english, Im from Argentina. And sorry too if Im in the wrong place. I need some knowledged about stats and this forum...

    Started by Capanegra‎, 07-27-2015 08:26 AM
    compare proportions
    • Replies: 9
    • Views: 188
    Today, 01:31 AM Go to last post
  2. Help in solving a question

    Hello everyone, I am working on some exercise questions from probability. I am stuck at this question. Can somebody help me to solve this. I would...

    Started by Aleem‎, Yesterday 04:09 PM
    • Replies: 0
    • Views: 40
    Yesterday, 04:09 PM Go to last post
  3. Hypergeometric distribution appears to have hidden problems

    When I was writing a computer program to calculate hypergeometric distributions probabilities I had some funny results. This is because I just used...

    Started by Swayseker‎, Yesterday 12:57 PM
    conditions, hypergeometric, probability
    • Replies: 1
    • Views: 54
    Yesterday, 01:34 PM Go to last post
  4. Probability of an accident

    Looking for help with this problem: A train will pass the same point every 7.5 minutes everyday of the week from 4am to 8am. There are 3380...

    Started by JacQue DuBois‎, 07-28-2015 03:29 PM
    • Replies: 6
    • Views: 215
    Yesterday, 12:24 PM Go to last post
  5. Expectation of truncated normal X conditional on truncated normal Y

    I am trying to derive: E(X|a \leq Y \leq b) where c \leq X \leq d , X and Y are (doubly truncated) Gaussians with the same mean and different...

    Started by CLP_PS‎, 07-27-2015 06:35 PM
    • Replies: 2
    • Views: 180
    07-28-2015, 10:37 AM Go to last post
  6. Layperson with a question

    Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

    Started by Phi618‎, 07-20-2015 07:11 PM
    • Replies: 11
    • Views: 449
    07-27-2015, 07:44 PM Go to last post
  7. Help with Bayesian question please

    Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

    Started by jamessuh36‎, 07-22-2015 08:31 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 48
    • Views: 913
    07-27-2015, 09:48 AM Go to last post
  8. Need help with 2x2 table

    Hey guys, Struggling to put this question into a 2x2 table. Any help would be appreciated. A new drug has been developed to manage early...

    Started by Hark‎, 07-26-2015 08:29 PM
    • Replies: 1
    • Views: 123
    07-27-2015, 05:35 AM Go to last post
  9. Probability of 20 people drawing the same card 9 or more times in a deck of cards.

    Hello! This is my first post so apologies if I'm out of line :-S! I've looked EVERYWHERE and haven't found a problem that I an use as a model... I've...

    Started by imackenzie‎, 07-25-2015 12:35 PM
    • Replies: 2
    • Views: 155
    07-26-2015, 06:58 AM Go to last post
  10. Help is needed for a probability question

    Homework needs to be done during the weekends. Question is A box contains 2 red balls and 4 yellow balls. If a ball is randomly drawn from the...

    Started by lcaine96‎, 07-24-2015 11:51 AM
    • Replies: 2
    • Views: 109
    07-24-2015, 12:29 PM Go to last post
  11. Book for stochastic processes

    I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

    Started by askazy‎, 07-07-2015 05:58 PM
    • Replies: 4
    • Views: 274
    07-22-2015, 01:23 PM Go to last post
  12. Counting problem?

    NOW SOLVED. SPECIAL THANKS TO rogojel and con-tester. This is probably a simple problem, but I have been through my 8 counting rules about different...

    Started by Swayseker‎, 07-22-2015 07:41 AM
    • Replies: 3
    • Views: 108
    07-22-2015, 10:55 AM Go to last post
  13. Random numbers

    Hello, let me go direct to point: Let's say i have a total of 60 numbers (1-60) and i can generate 6 random numbers among them, in this case: 5,...

    Started by msw‎, 06-01-2015 01:28 AM
    • Replies: 12
    • Views: 550
    07-22-2015, 08:00 AM Go to last post
  14. Binomial question?

    I have this question that I think is binomial probability. Bananas that are almost ripe to pick carry the chance of being 15% rotten. What would be...

    Started by chrismyers1‎, 04-23-2015 09:42 AM
    • Replies: 4
    • Views: 390
    07-21-2015, 12:32 PM Go to last post
  15. Poisson and binomial distributions

    I composed this question: A hospital has 20 ambulances and on average 2 break down a day. There are five ambulances in reserve and if more then five...

    Started by Swayseker‎, 07-21-2015 10:33 AM
    binomial, poisson
    • Replies: 2
    • Views: 116
    07-21-2015, 10:57 AM Go to last post
  16. A little help with choosing tests?

    Hello, I am new here. A little background, I am a Masters of Forensic Science student with a little statistics knowledge. I am currently working...

    Started by blpierce76‎, 07-15-2015 09:39 AM
    • Replies: 9
    • Views: 511
    07-21-2015, 09:32 AM Go to last post
  17. Probabilistic models - clarification on separation of model and solver

    Almost all of the material I read on probabilistic models/ probabilistic programming mentions separating solver and the model, thus stating the...

    Started by optimist‎, 07-20-2015 08:38 AM
    probabilistic sampling, probability model
    • Replies: 0
    • Views: 87
    07-20-2015, 08:38 AM Go to last post
  18. Calculating a stochastic matrix with multiple states

    I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

    Started by Codetemplar‎, 07-12-2015 07:42 AM
    • Replies: 1
    • Views: 258
    07-14-2015, 11:02 AM Go to last post
  19. variance of a function of random variables

    Hi all, I'm trying to calculate the variance of a function of two continuous random variables and could do with a nudge in the right direction...

    Started by james92‎, 07-11-2015 11:14 AM
    • Replies: 1
    • Views: 160
    07-11-2015, 11:58 AM Go to last post
  20. Trying to calculate confidence intervals

    Hi everyone. The numbers below are the annual maintenance costs of a program I am working on. I'd like to use the data set to estimate future costs...

    Started by costgeek‎, 07-08-2015 09:11 AM
    cdf, confidence, distribution, probability
    • Replies: 2
    • Views: 250
    07-08-2015, 10:02 AM Go to last post
  21. Probabiilities help

    The question I am trying to answer is: What is the probability of dealing three black cards from a standard deck when dealing them from a standard...

    Started by klee04268‎, 07-05-2015 01:00 PM
    • Replies: 4
    • Views: 286
    07-05-2015, 05:22 PM Go to last post
  22. Probability Ideas in the monty Hall problem Stats class assignment help!

    Watch a YouTube video that explains the problem: "Monty Hall Problem with Ron Clarke", this video starts with "Hello and welcome to the Monty Hall...

    Started by notastatswizard‎, 06-30-2015 02:36 AM
    • Replies: 2
    • Views: 357
    06-30-2015, 04:48 PM Go to last post
  23. Help Please...

    I have no idea how to solve this problem A survey of undergraduate calculus and physics students showed that 58% of them had donated blood at...

    Started by Solodolo7‎, 06-29-2015 05:32 PM
    • Replies: 0
    • Views: 243
    06-29-2015, 05:32 PM Go to last post
  24. how to find MGF ?

    E(X^r)=(r+1)!* (2^r). we have to find MGF of random variable X.

    Started by Avnish29‎, 06-29-2015 02:38 PM
    • Replies: 0
    • Views: 81
    06-29-2015, 02:38 PM Go to last post
  25. Please help!

    I am a 58 yr old Grandpa looking to see if there is Shananagan's are going on at my work. I want to find out the probability in this scenario. You...

    Started by geades‎, 06-29-2015 12:15 PM
    • Replies: 2
    • Views: 111
    06-29-2015, 01:19 PM Go to last post
  26. Expected value of absolute value without replacement

    I'm trying to figure something out for as a curiosity of mine, and I apparently can't remember enough of my college statistics class to solve it. If...

    Started by Akolas‎, 06-29-2015 10:54 AM
    • Replies: 1
    • Views: 79
    06-29-2015, 11:31 AM Go to last post
  27. Crying inside 😖 just can't quite get probability

    I'm taking stats online and this unit is on probability. I'm having a terrible time understanding it. The conditional probability rule is where I'm...

    Started by notastatswizard‎, 06-29-2015 03:03 AM
    • Replies: 0
    • Views: 175
    06-29-2015, 03:03 AM Go to last post
  28. Mapping a pdf to peaky pdf

    Hi All, From past few days I am trying to model this mapping function. I want to map a distribution(uniform/non-uniform) to a more peaky...

    Started by praj_7‎, 06-27-2015 12:44 PM
    • Replies: 0
    • Views: 175
    06-27-2015, 12:44 PM Go to last post
  29. Analysis of Squash Match

    I've been stuck on this problem for days. Any help, solutions or just pointers would be very welcome. A squash match is composed of a number of...

    Started by pvm‎, 06-25-2015 07:32 AM
    • Replies: 0
    • Views: 208
    06-25-2015, 07:32 AM Go to last post
  30. Lightbulb Higher standard deviation than the mean

    HI ! Excuse me for my english, my writing is not very good. I want to know what implies or what explains in an excercise when the standard deviation...

    Started by alvaroiv‎, 06-22-2015 06:55 PM
    • Replies: 3
    • Views: 329
    06-23-2015, 07:42 AM Go to last post
  31. Non parametric distribution

    Hello everyone, I have the following problem I could not solve (I published it before but it seem it did not get through. The authors is making a...

    Started by ndm905‎, 06-21-2015 07:39 PM
    • Replies: 0
    • Views: 18
    06-21-2015, 07:39 PM Go to last post
  32. Post WANT Theoretical Probabilities theory books suggestion

    Hello, I am reading a theoretical probability theory book " Probability Theory: The Logic of science " by E.T.Jaynes. But, this book is very advanced...

    Started by ansh23898‎, 06-20-2015 09:35 AM
    book, probability theory, theory
    • Replies: 1
    • Views: 265
    06-21-2015, 01:50 AM Go to last post
  33. Probability of completing multiples of objects

    Hey Guys! I'm struggling with a posed question about completing a set of objects and would really appreciate some direction. EX: There are 10...

    Started by Sigbog‎, 06-16-2015 07:45 PM
    • Replies: 3
    • Views: 289
    06-18-2015, 01:52 PM Go to last post
  34. Book recommendations for distributions?

    Hi everyone, I'm relatively new to stats (have done two beginner courses on it), and I feel like I learn best when I have an engaging book by my...

    Started by curious_notes‎, 06-17-2015 05:13 PM
    • Replies: 2
    • Views: 194
    06-17-2015, 10:15 PM Go to last post
  35. Monty Hall with Bayes Theorem

    hi, I just ran across a strange statement in the solution of the MH problem with Bayes as it is described here for instance...

    Started by rogojel‎, 06-17-2015 12:05 AM
    • Replies: 0
    • Views: 152
    06-17-2015, 12:05 AM Go to last post
  36. Calculating observed probability

    Can anyone point me towards the formula and extra reading I would need to calculate how many observations I would need to make in order to calculate...

    Started by ThomasCNot‎, 06-10-2015 08:41 AM
    confidence interval, observed probability
    • Replies: 3
    • Views: 324
    06-12-2015, 06:15 AM Go to last post
  37. hi every body

    hi everybody I'm new here I'm doing a research I have a questionnaire with 3 scales positive neutral negative which i want to do statics using...

    Started by hragaey‎, 06-10-2015 06:45 PM
    • Replies: 2
    • Views: 293
    06-11-2015, 09:21 AM Go to last post
  38. Getting standard deviation given probability

    Hi all If you have a mean of 2 and you want to get standard deviation with probability of 90% that the new mean will lie between 1.5 and 2.5. I...

    Started by Ahmed Arnous‎, 06-10-2015 01:08 PM
    • Replies: 4
    • Views: 172
    06-10-2015, 03:31 PM Go to last post
  39. CHI^2 test for binomial variables which are not normally distributed

    Hello, Assume that you have X_1\cdot X_n independant random variables. If they are normally distributed we can use the Chi^2 statistical test to...

    Started by CBW‎, 06-10-2015 07:59 AM
    • Replies: 0
    • Views: 129
    06-10-2015, 07:59 AM Go to last post
  40. Conditional density, bivariate normal

    Let Z=X+Y where X \sim N(\mu,\sigma^2) and Y \sim N(0,1) are independent. What is the conditional density of X given Z, f_{X|Z}(x|z)? I already...

    Started by askazy‎, 06-09-2015 09:26 PM
    bivariate normal, conditional density
    • Replies: 3
    • Views: 213
    06-10-2015, 05:51 AM Go to last post
  41. Probability Applications - Drawing from a Deck of Cards

    Hi! I am having trouble figuring out how to go about solving the following problem: "Find the probability of obtaining the given 5-card poker...

    Started by punky3295‎, 06-06-2015 12:04 PM
    cards problem, probability, statistics
    • Replies: 1
    • Views: 305
    06-06-2015, 12:35 PM Go to last post
  42. What is the probability of not drawing a club from a deck of cards

    Hi, Can someone help me with this please? You draw 40 playing cards, 1 at a time, with replacement from a standard deck. What is the probability...

    Started by pawilliams‎, 06-05-2015 03:53 AM
    • Replies: 2
    • Views: 270
    06-05-2015, 07:43 AM Go to last post
  43. Probability of solder ball inside a sealed package able to cause a failure

    I have a hermetically sealed semiconductor package, NAND. And I have some foreign object debris (FOD), solder balls to be exact, inside this device....

    Started by ChootarLaal‎, 06-04-2015 09:21 AM
    • Replies: 0
    • Views: 167
    06-04-2015, 09:21 AM Go to last post
  44. Probability of default

    What is the probability of default in 2 years? The probabilit of default year 1= 10% The probability of default year 2 = 10%

    Started by kronofogdn‎, 06-04-2015 02:03 AM
    • Replies: 0
    • Views: 124
    06-04-2015, 02:03 AM Go to last post
  45. My program TARGETS

    I used a Monte Carlo method of finding probabilities of collisions between a randomly tossed circular block and non-overlapping randomly placed...

    Started by ArtK‎, 06-03-2015 02:42 PM
    • Replies: 0
    • Views: 194
    06-03-2015, 02:42 PM Go to last post
  46. Probability

    This is not part of any homework, but an odd occurrence that happened within our family and I'd just like to find out what the chances/odds of this...

    Started by NOTamathguy‎, 05-29-2015 07:22 AM
    • Replies: 4
    • Views: 378
    05-29-2015, 09:54 PM Go to last post
  47. Generate simulation data with PDF and ACF

    Dear I'am trying to model a wireless channel based on throughput measurements. I've processed the measurements and approximated the PDF of the...

    Started by Pieter Cardoen‎, 05-27-2015 03:53 AM
    • Replies: 4
    • Views: 370
    05-27-2015, 09:30 AM Go to last post
  48. Probability to win

    Hello, I would like to calculate the probability to win 3 times in a lottery considering the following: 1 - the chance to win 1 time is 1 in...

    Started by Marcus5800‎, 05-24-2015 07:21 PM
    • Replies: 11
    • Views: 438
    05-25-2015, 01:54 PM Go to last post
  49. probability of 8 successes out of 256 events

    Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line...

    Started by censura‎, 05-21-2015 02:44 AM
    • Replies: 5
    • Views: 413
    05-25-2015, 06:12 AM Go to last post
  50. probability of choosing number

    I have a question related to probability of choosing numbers. If there is 5 people picking numbers from 1 to 5, there is 5^5 ways to pick...

    Started by ikemen‎, 05-24-2015 01:03 AM
    • Replies: 1
    • Views: 221
    05-25-2015, 05:47 AM Go to last post
  51. Question Bayes's Theorem

    Hi! Say there is a deck of 100 cards: Red w/ numbers = 40 Red w/ figures=15 Black w/ numbers=35 Black w/ figures=10 The only information...

    Started by DrAnthonyRodriguez‎, 05-22-2015 07:42 AM
    bayes' theorem
    • Replies: 4
    • Views: 292
    05-23-2015, 03:22 AM Go to last post
  52. Probability definition

    Hi stats guys, I had a heated discussion about the following situation today: Lets say I have a function f(x) producing values between 0 and...

    Started by Stats_Newbie‎, 05-22-2015 09:48 AM
    • Replies: 6
    • Views: 265
    05-22-2015, 10:40 AM Go to last post
  53. A little help

    I know that a event with two outcomes such as making a three throw in basketball doesn't necessarily have a probability of 0.50, it could range...

    Started by misterx‎, 05-16-2015 08:41 AM
    • Replies: 1
    • Views: 324
    05-18-2015, 07:42 AM Go to last post
  54. differential distribution frequency

    Hi there. pls I'm studying the production of energy from sawdust.So I need a firm grip in powder technology.Can anyone pls show me mathematically how...

    Started by PSDman‎, 05-14-2015 03:26 PM
    • Replies: 0
    • Views: 216
    05-14-2015, 03:26 PM Go to last post
  55. Bayesian Convergence

    I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

    Started by hlsmith‎, 05-10-2015 10:04 PM
    • Replies: 7
    • Views: 420
    05-13-2015, 03:26 AM Go to last post
  56. Combination of families of fragility curves (cumulative probability functions)

    Hi guys, I am a geotechnical engineer and currently involved in a project for risk calculation of an embankment dam. It's my first post here, I am...

    Started by sandreev‎, 05-11-2015 09:42 AM
    conditional probability, engineering, fragilities, uni-modal limits theorem
    • Replies: 0
    • Views: 242
    05-11-2015, 09:42 AM Go to last post
  57. Wink Probability on Roulette. Just curious!

    Hello all. Could you help me? I have been discussing the following topic with my work teammates; We were talking about statistics and...

    Started by thenewone‎, 05-08-2015 07:30 PM
    bayers theorem, chaos, random, roulette
    • Replies: 2
    • Views: 305
    05-11-2015, 09:26 AM Go to last post
  58. Probability of relations in a network

    Imagine i have a predicate $friends(p_1, p_2)$ and I know that $p(friends(p_1, p_2)) = p_1$. If I generate a world of $n$ people, I expect there to...

    Started by d.hammer‎, 05-08-2015 07:29 AM
    graph, probability
    • Replies: 0
    • Views: 192
    05-08-2015, 07:29 AM Go to last post
  59. Google Earth circles probability

    Hi everyone. Not sure if this is the right forum but I'll give it a go. Q: If you draw a circle on a sphere, what are the odds that a randomly...

    Started by BedrockGeometry‎, 05-07-2015 05:27 AM
    • Replies: 3
    • Views: 275
    05-07-2015, 08:58 AM Go to last post
  60. dice rolling odds. please help!

    Suppose you have a FIVE sided dice. One of the sides has a star on it, the other four sides are blank. Suppose you rolled it 10 times. What are the...

    Started by ospreyx‎, 05-06-2015 06:59 PM
    dice, odds, probability, statistics
    • Replies: 1
    • Views: 200
    05-06-2015, 08:38 PM Go to last post

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