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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: 31,141
    09-30-2005, 09:44 AM Go to last post
  1. Markov Chains state classification

    Just learning about Markov Chains and the classification of states. We were told \displaystyle\sum_{n=1}^\infty p_{ij} (n)=\infty if the state is...

    Started by Prometheus‎, 01-21-2014 07:10 AM
    • Replies: 0
    • Views: 1,559
    01-21-2014, 07:10 AM Go to last post
  2. best ebook for daily life probability problems

    Hi, can any one tell me please best ebook for daily life problems of probability.I have done a search but not found yet...

    Started by sara b‎, 01-17-2014 11:28 PM
    • Replies: 4
    • Views: 1,695
    01-20-2014, 04:14 PM Go to last post
  3. Quirky question about F-distribution.

    Hi We can create an F-distribution if we have two independent chi-squared random variables, and we divide them by their own degress of freedom,...

    Started by Tarly‎, 01-20-2014 01:32 PM
    • Replies: 2
    • Views: 1,483
    01-20-2014, 02:12 PM Go to last post
  4. Probability of two random uniform variables

    Suppose X is uniform and Y is uniform . We want to find the pdf of the X+Y for the general uniform random variables. Using the characteristic...

    Started by stephanie‎, 01-18-2014 12:58 AM
    • Replies: 2
    • Views: 1,660
    01-20-2014, 06:02 AM Go to last post
  5. probability of a game of drawing balls

    I am new to probability :D, I do one question and stuck for days. Would you all can give me a hint on it? There are (n \geq 1) balls in a bin. n-1...

    Started by henrycwk11‎, 01-17-2014 12:20 PM
    probability
    • Replies: 0
    • Views: 1,461
    01-17-2014, 12:20 PM Go to last post
  6. Disjoint events

    Hello, my task is this: The asociation of two disjoint events A and B is the certain event. From the event X and the Events A and B are known,...

    Started by ksx‎, 01-17-2014 04:26 AM
    • Replies: 0
    • Views: 1,234
    01-17-2014, 04:26 AM Go to last post
  7. Probability help

    Hey guys I'm new to this site, and I could really use some help! I am currently in a stats class and I'm so terrible with numbers it's not even...

    Started by cthurman‎, 01-15-2014 07:27 PM
    • Replies: 2
    • Views: 1,889
    01-16-2014, 09:35 AM Go to last post
  8. Method of sampling

    If 25 people sign up for a workshop which has room for only 10, the naive way to select 10 is to put 25 numbers in a hat and choose 10 (assuming each...

    Started by Akrodon‎, 01-14-2014 08:45 PM
    • Replies: 2
    • Views: 1,681
    01-15-2014, 01:30 AM Go to last post
  9. unconditional expectation for GARCH model with normal inovations

    Hi i have been asked to find unconditional expectations and then a recursive relation. I think I have started well but i am confused at how the...

    Started by grj1‎, 01-14-2014 04:52 PM
    expectation, models, probability, recursive functions
    • Replies: 2
    • Views: 2,230
    01-14-2014, 10:42 PM Go to last post
  10. Expectation of a density function

    Hi guys, I have a question about the calculation of the expectation based on a density function where the integral is NOT 1. Is it okay to...

    Started by Stats_Newbie‎, 01-14-2014 10:23 AM
    • Replies: 4
    • Views: 2,551
    01-14-2014, 02:07 PM Go to last post
  11. Conditional Distribution over the unit Disk

    Suppose the Random Variables U and V are uniform (-1,1). How can I show that their conditional distribution, given U^2+V^2 <1 , is ...

    Started by JohnK‎, 01-13-2014 08:37 AM
    • Replies: 2
    • Views: 1,624
    01-14-2014, 09:28 AM Go to last post
  12. Help please

    An Olympic archer is able to hit a bull's-eye 80%of the time. Assume each shot is independent. If she shoots 6 arrows, what's the probability of her...

    Started by hopelessly requires help‎, 01-11-2014 03:50 PM
    • Replies: 1
    • Views: 1,125
    01-14-2014, 02:27 AM Go to last post
  13. Permutations involving additional chances

    I am attempting to calculate the probabilities of a simple dice game. I have actually calculated the perfect score, and the additional permutations...

    Started by Absinthe‎, 07-08-2012 06:44 PM
    • Replies: 6
    • Views: 2,950
    01-13-2014, 09:44 AM Go to last post
  14. What is the probability of an event occurring when the compliment ~1 does not occur?

    Theoretically lets suppose under a certain assumption that an event 'e' has the probability of being labelled 'A' as a function of time t by a...

    Started by Eddy‎, 01-12-2014 08:08 AM
    • Replies: 0
    • Views: 1,178
    01-12-2014, 08:08 AM Go to last post
  15. A game with two dices

    Imagine a game with two players and referee. The referee rolls two unbiased dices: one of the dices outcome is a score and the other dice outcome...

    Started by lgon‎, 01-11-2014 09:06 AM
    dices, game
    • Replies: 3
    • Views: 1,335
    01-11-2014, 10:38 AM Go to last post
  16. Throwing a ball

    Imagine a game where you throw a ball in to a box where are three sticks; the probability of the ball to throw down one stick is 75%, two sticks is...

    Started by lgon‎, 01-10-2014 10:23 AM
    game
    • Replies: 8
    • Views: 2,378
    01-11-2014, 04:18 AM Go to last post
  17. Reliability and Regularity

    Hello, I'm looking for a textbook that has worked examples on reliability and regularity. I think something similar to a Schaum's outline would be...

    Started by ishihara‎, 01-10-2014 01:09 AM
    • Replies: 0
    • Views: 978
    01-10-2014, 01:09 AM Go to last post
  18. Game scenario (expected value)

    You're in a game with 20 peers. You roll a die. Rolling a one -> 1 point & choose if you want to roll again Rolling a two -> 2 points &...

    Started by mathfreak33‎, 01-08-2014 07:27 PM
    • Replies: 3
    • Views: 2,130
    01-08-2014, 10:50 PM Go to last post
  19. Odds & Probabilities

    My 8 year old grandson is fascinated by the NFL playoffs. We were looking at a website that showed the odds of winning the Super Bowl for each of 12...

    Started by Jennifer Murphy‎, 01-07-2014 01:18 PM
    • Replies: 11
    • Views: 2,049
    01-08-2014, 04:29 AM Go to last post
  20. Fantasy Football - Projecting Team Scores

    I am frankly embarrassed to be asking this but my searches on the forum for “fantasy football” haven’t yielded many useful results. Or at least not...

    Started by LH13‎, 01-07-2014 02:57 PM
    • Replies: 3
    • Views: 1,252
    01-07-2014, 11:48 PM Go to last post
  21. Standard deviation of a set of random odds

    Imagine I have n mutually exclusive events whose probabilities are perfectly random. The sum of their probabilities is 1 of course. What is their...

    Started by giacecco‎, 01-07-2014 01:10 PM
    odds, probability, standard deviation, variance
    • Replies: 2
    • Views: 1,553
    01-07-2014, 01:24 PM Go to last post
  22. Indepedence mutually exclusiveness

    I'm working my way through my ACTEX study guide for the probability exam, and a question is really tripping me up. It goes like this: You are...

    Started by seedofwinter‎, 01-06-2014 01:21 PM
    • Replies: 2
    • Views: 1,480
    01-06-2014, 02:35 PM Go to last post
  23. Video Forensics; Pattern recognition and extrapolation

    I'll just start from the beginning. The police edited an arrest video and the regional FBI office is acting like they can't prove it. Wish I was...

    Started by AwsedreswA‎, 01-06-2014 11:39 AM
    • Replies: 0
    • Views: 1,226
    01-06-2014, 11:39 AM Go to last post
  24. Need help

    hey guys, I found this forum using google. and I really hope you guys can help me. This is the question: Every box of a smartphone has a coupon...

    Started by zekit‎, 01-03-2014 08:37 AM
    • Replies: 4
    • Views: 1,767
    01-03-2014, 03:16 PM Go to last post
  25. Binomial question

    Hi, I have attached a binomial question in excel (question & solution). In part (e), the question asks for the P(between 5 and 15 inclusive)...

    Started by pcampin‎, 12-30-2013 09:52 PM
    • Replies: 1
    • Views: 1,363
    01-03-2014, 12:01 AM Go to last post
  26. Chi squared probability

    If W/4 ~ Chi-Squared with some degrees of freedom and hence we find that: P(a/4 < W/4< b/4 ) = 0.056 then is it correct to say that:...

    Started by spairos‎, 01-02-2014 10:51 PM
    • Replies: 1
    • Views: 1,999
    01-02-2014, 11:42 PM Go to last post
  27. Expectation of variance

    Trying to figure out the expectation of the population variance, i.e. Egetting stuck on what I'm sure will turn out to be some simple algebra. I...

    Started by Prometheus‎, 12-29-2013 08:03 AM
    • Replies: 6
    • Views: 3,697
    01-02-2014, 02:42 PM Go to last post
  28. Complex probability relating to NYC taxi cabs

    There are 13,000 taxi cabs in New York City. Let's say I have taken 600 rides (each one in a random cab). What are the chances that I have...

    Started by mattcaps‎, 06-04-2013 09:57 PM
    • Replies: 5
    • Views: 2,645
    12-30-2013, 10:21 AM Go to last post
  29. Bivariate random variable problem

    Hello I am trying to solve this problem: A coin is given with probability 1/3 for head (H) and 2/3 for tail (T). The coin is being drawn N...

    Started by Yankel‎, 12-30-2013 02:18 AM
    • Replies: 1
    • Views: 2,449
    12-30-2013, 07:16 AM Go to last post
  30. uses or ways to understand the 5th order moment of a distribution?

    hello forum, as much as i'd like to believe it's not true, winter break is coming to an end which means i'm slowly getting back to my uni stuff....

    Started by spunky‎, 12-29-2013 02:10 PM
    • Replies: 0
    • Views: 1,576
    12-29-2013, 02:10 PM Go to last post
  31. Help solving a probability problem

    I encountered the following problem. I am not very sure on how to solve it. Can someone help me solve the problem. Problem: A dart is thrown onto...

    Started by Sujeeth Kumaravel‎, 12-27-2013 01:28 PM
    • Replies: 0
    • Views: 1,428
    12-27-2013, 01:28 PM Go to last post
  32. Multivariate Survival and Distribution Functions

    Hello, I would like to confirm if the attached relationship between the multivariate survival and the distribution functions is correct. I read...

    Started by bacalfa‎, 12-24-2013 01:56 PM
    • Replies: 2
    • Views: 1,442
    12-25-2013, 01:35 PM Go to last post
  33. Expected value in a triangular distribution

    Hi All, I'm struggling to understand following problem. It says, Demand follows a triangular distribution. Minimum 500 Mode 6,000 ...

    Started by PremNath‎, 12-24-2013 12:30 AM
    expected value, triangular distribution
    • Replies: 1
    • Views: 3,992
    12-24-2013, 01:22 AM Go to last post
  34. Help with 3D Gaussian Distribution Formula in Excel?

    Hi Everyone, I am looking for some help! I am not a statistician but use 3 Gaussian distributions in my work which is all Excel based. I...

    Started by Felix‎, 12-21-2013 06:48 PM
    • Replies: 2
    • Views: 4,934
    12-23-2013, 11:22 AM Go to last post
  35. factor analysis

    i can u plz tell me. as i am management student and not strong in econometrics.... kindly if u can reply my question...would be appretiabale . i...

    Started by saira‎, 12-22-2013 04:42 AM
    • Replies: 3
    • Views: 1,817
    12-22-2013, 06:26 AM Go to last post
  36. Privacy vs safety, please critique

    Feel free to put in your own reasonable numbers. AT&T says US citizens value their privacy at $350/year. My chance of being killed by some...

    Started by Outlier‎, 12-18-2013 05:34 PM
    • Replies: 6
    • Views: 2,082
    12-20-2013, 09:23 AM Go to last post
  37. Probability question

    In a certain family, the four children take turns washing dishes. Out of a total of four breakages, three were caused by the youngest child, who...

    Started by ishihara‎, 12-19-2013 10:22 PM
    • Replies: 1
    • Views: 1,755
    12-20-2013, 02:51 AM Go to last post
  38. Apartment vacancy question

    My friend is in this exact situation and we are having trouble figuring out the probability - please help! She is looking for a top-floor...

    Started by Colryk‎, 12-18-2013 11:16 PM
    probability help
    • Replies: 2
    • Views: 1,401
    12-19-2013, 05:52 PM Go to last post
  39. Distribution of continuous random variable

    Hi all, I have been struggling with this problem for quite a while now and I am getting nowhere:( The problem is this: I have been given a...

    Started by frodo‎, 12-17-2013 04:19 PM
    • Replies: 1
    • Views: 1,289
    12-18-2013, 05:25 AM Go to last post
  40. Probability Proportion Question

    Hello I am having a bit of difficulty understanding how to go about this question. A very large airline claims that 90% of their flight departures...

    Started by aaron7058‎, 12-17-2013 04:07 PM
    • Replies: 1
    • Views: 1,694
    12-18-2013, 12:22 AM Go to last post
  41. Expectation-Maximization-Algorithm: example exponential family

    Hi everyone! I’m in desperate need of an example (one with actual numbers!) for the EM-algorithm concerning exponential families. I spend a lot of...

    Started by statisticskipper‎, 12-17-2013 05:53 PM
    em-algorithm, expectation-maximization, exponential
    • Replies: 0
    • Views: 2,580
    12-17-2013, 05:53 PM Go to last post
  42. Simple probability problem

    A glass jar contains 55 red and 25 blue marbles. What's the probability of choosing a red marble 16 times in a row. After a pick the marbles don't go...

    Started by probs‎, 12-15-2013 05:16 AM
    probability, statistics
    • Replies: 1
    • Views: 1,843
    12-15-2013, 09:32 AM Go to last post
  43. Total probability formula on conditional probability

    Hi, i'm studying one mathematical model for game theory and there is a formula that i'm not sure it is correct. It says: p(z/Y)=p(z,cs/Y) +...

    Started by kdzekov‎, 12-14-2013 12:18 PM
    • Replies: 1
    • Views: 2,059
    12-15-2013, 06:58 AM Go to last post
  44. lizards probability question

    Note: This is not homework, I am a Biologist trying to learn basic statistics. Hi, I am trying to learn basic probability and I would like to get...

    Started by mazatlan‎, 12-14-2013 11:42 PM
    • Replies: 0
    • Views: 1,809
    12-14-2013, 11:42 PM Go to last post
  45. Resolution of your sample size and Confidence Intervals

    I'm look for some generalized guidance. Let's say I have 200 stores. I test 10 of these for a month doing some sort of specialized promotion. I...

    Started by cmorin‎, 12-13-2013 07:30 PM
    • Replies: 0
    • Views: 1,649
    12-13-2013, 07:30 PM Go to last post
  46. Odds in random sampling

    Hello, I need help figuring out odds of a random sampling. If you have a pool of 1600 numbers, and you draw two numbers a day for 90 days, what are...

    Started by keda69‎, 12-13-2013 03:37 PM
    • Replies: 0
    • Views: 1,775
    12-13-2013, 03:37 PM Go to last post
  47. This doesn't make sense to me

    Can anyone please help me make sense of the following: "Just because something is the most probable outcome doesn’t mean it is the most likely...

    Started by The Game‎, 12-10-2013 04:56 PM
    • Replies: 9
    • Views: 2,425
    12-12-2013, 10:37 AM Go to last post
  48. Hi, please help me this one Statistic question for test tomorrow?

    1. Subway Sandwiches wishes to introduce a new condiment, carrot, to its sandwiches. To test whether "carrots" will be well-received by its...

    Started by christianivan‎, 12-11-2013 02:07 PM
    • Replies: 1
    • Views: 1,281
    12-12-2013, 02:17 AM Go to last post
  49. Transform random variables to uniforms using their CDF

    Hello, I researching the Joint Normal Transform methodology. I only have a basic statistics. How would you transform a random variable to its...

    Started by bradyj2‎, 04-02-2012 05:53 AM
    • Replies: 2
    • Views: 2,371
    12-11-2013, 07:09 PM Go to last post
  50. Please explain logic behind a given solution

    The following example is from Ryser's book Combinatorial Mathematics: "The number of 12-letter words that can be formed from 4 A's, 4 B's, 2 C's...

    Started by X-man‎, 12-05-2013 09:19 PM
    • Replies: 4
    • Views: 1,896
    12-10-2013, 03:19 PM Go to last post
  51. the likehood fonction for Log-periodic-power-law ?

    can anyone help me to found the the likehood fonction for Log-periodic-power-law ? log(y(t))=A+(B(t-tc)^beta )(1+Ccos(wlog(tc-t)+phi))...

    Started by opuntia‎, 12-09-2013 06:08 PM
    estimate, likelihood, lppl
    • Replies: 0
    • Views: 2,107
    12-09-2013, 06:08 PM Go to last post
  52. Is the answer to this problem correct?

    Q. You have an examination where there are multiple-choice questions. You have a choice of five answers, one is correct. If you had no idea of any of...

    Started by vasuchopra‎, 12-09-2013 10:02 AM
    • Replies: 2
    • Views: 2,608
    12-09-2013, 12:43 PM Go to last post
  53. Geometric Brownian Motion with Markov Switching Volatility

    Hi all, Suppose dx_{t}/x_{t}=\mu dt+\sigma_{t}dB_{t} where B is the standard brownian motion, and where ...

    Started by gzm‎, 12-06-2013 07:05 PM
    • Replies: 1
    • Views: 1,817
    12-07-2013, 01:34 PM Go to last post
  54. Difference between mean and expected value

    Could someone please explain as simply as possible the difference between mean and expected value? Here is my problem: This is for my math stats...

    Started by defrost‎, 12-06-2013 09:58 PM
    • Replies: 2
    • Views: 5,097
    12-07-2013, 11:06 AM Go to last post
  55. Dice probability question - Settlers of Catan

    Hello everyone, Let me begin by saying that this isn't a homework question. Rather, this is a question that relates to a personal inquiry into...

    Started by PrettyCities‎, 12-06-2013 08:26 PM
    • Replies: 3
    • Views: 5,167
    12-07-2013, 06:40 AM Go to last post
  56. P-Value

    Problem sovled

    Started by ianhirst‎, 12-06-2013 06:21 PM
    • Replies: 1
    • Views: 1,877
    12-06-2013, 06:27 PM Go to last post
  57. MLEs help!

    I meet a problems when doing my statistics homework! The question is, Let X and Y be independent exponential random variables with f(\mathbf{x} |...

    Started by lyb2012‎, 12-05-2013 06:07 AM
    • Replies: 2
    • Views: 3,321
    12-05-2013, 10:29 AM Go to last post
  58. Conditional distribution

    Let X be a random variable. Given: -P(X = 1) = 1/2 -P(X = 2) = 1/2 -The conditional distribution of Y given X is an exponential with rate X. ...

    Started by asdfman‎, 12-05-2013 05:14 AM
    • Replies: 1
    • Views: 1,173
    12-05-2013, 06:14 AM Go to last post
  59. Probability

    Solved thankyou

    Started by ianhirst‎, 12-04-2013 08:04 PM
    • Replies: 1
    • Views: 1,747
    12-05-2013, 12:05 AM Go to last post
  60. Binomial probability question

    Hi all, I have been stumped on this binomial probability question and was wondering if anyone can help me get started: I was thinking...

    Started by cyanogen1024‎, 12-01-2013 10:50 PM
    • Replies: 2
    • Views: 2,074
    12-04-2013, 02:48 PM Go to last post

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