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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: 30,184
    09-30-2005, 09:44 AM Go to last post
  1. Stochastic Process a martingale

    Hey guys I posted here a couple months ago and everyone was really helpful. I am reaching out tonight to make sure I am doing a problem correctly. I...

    Started by LED2127‎, 07-01-2012 08:01 PM
    • Replies: 0
    • Views: 1,770
    07-01-2012, 08:01 PM Go to last post
  2. Point me in the right direction on a game probability

    This is my third time typing this grrrr. Let's hope my login holds this time. I have written a dice game for the computer and now I am trying to...

    Started by Absinthe‎, 05-26-2012 08:21 PM
    • Replies: 3
    • Views: 1,927
    06-30-2012, 07:52 PM Go to last post
  3. Whats the probability the parameters of my random sample match those of the whole?

    I have been posed a problem, which i am struggling with: If I have a box of 2,808 lottery style tickets with winning ticket /denominations as...

    Started by RAWUK‎, 05-09-2012 11:17 AM
    • Replies: 2
    • Views: 1,876
    06-29-2012, 12:19 PM Go to last post
  4. Generate Random Correlated Variable

    I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For...

    Started by cisaak‎, 01-15-2012 11:18 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 15,186
    06-29-2012, 09:43 AM Go to last post
  5. Density function from discrete time values?

    Hello, I have a set of times achieved by an agent and want to determine if a probability density function can be derived from that set. Being a...

    Started by JayBee‎, 06-29-2012 04:14 AM
    • Replies: 1
    • Views: 1,836
    06-29-2012, 08:30 AM Go to last post
  6. Determining if a bag of coins contains fair coins

    This is actually a problem from a specific biological dataset, but can be more generally described as follows: I have a bag containing n coins....

    Started by Sunnymilk‎, 06-28-2012 05:26 PM
    • Replies: 1
    • Views: 1,126
    06-28-2012, 07:06 PM Go to last post
  7. Probability of 3 out of 4 Independent Events Occurring in Golf Foursome

    I have 4 golfers playing together in a foursome. I know the probability of each making a par or better on a given hole: A-player: 60% ...

    Started by hunt68‎, 06-28-2012 07:55 AM
    • Replies: 6
    • Views: 2,928
    06-28-2012, 10:11 AM Go to last post
  8. Determining the probability of an electric car charging station being available?

    Hi there, I'm just wondering if anybody would know of a way of determining the probability of an event. I trying to figure out how I could...

    Started by bradyj2‎, 06-27-2012 09:29 AM
    • Replies: 0
    • Views: 1,011
    06-27-2012, 09:29 AM Go to last post
  9. poisson distribution

    1)A car hire firm has 2 cars which it hires out day by day.The number of demands for a car on each day is distributed as a poisson distribution with...

    Started by prashant007‎, 06-27-2012 05:39 AM
    • Replies: 0
    • Views: 1,251
    06-27-2012, 05:39 AM Go to last post
  10. Polyp probability

    some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

    Started by intric8‎, 06-25-2012 09:17 AM
    • Replies: 12
    • Views: 2,430
    06-27-2012, 12:15 AM Go to last post
  11. Please Help: Finding a probability that is "at least" and "at most"

    Hi all, I have been working on this problem for a few days now and I think I am on the right track but not 100% sure. " ... If times are...

    Started by jennab‎, 06-26-2012 02:06 PM
    • Replies: 1
    • Views: 1,620
    06-26-2012, 09:30 PM Go to last post
  12. Adjusting ranges of probabilities based on a single variable

    Hi everyone, I've been trying to solve this problem for a few weeks now, but can't think of any solutions. I can't think of how to generalize...

    Started by Duke Silver‎, 06-26-2012 10:34 AM
    • Replies: 2
    • Views: 1,588
    06-26-2012, 10:43 AM Go to last post
  13. Field Assignment

    Please help me in finalizing all the sets in this event space. I am creating a field generated by script B: {{2,4},{6,8}}.

    Started by statisticsnewbie‎, 06-25-2012 10:14 PM
    field
    • Replies: 6
    • Views: 2,063
    06-26-2012, 12:29 AM Go to last post
  14. Need help to understand basic probability problem

    This thread is rather a continuation of http://www.talkstats.com/showthread.php/26030-Meanings-of-a-set-of-data/page3 Let consider following 2...

    Started by ngungo‎, 06-18-2012 01:39 PM
    • Replies: 9
    • Views: 2,206
    06-25-2012, 09:00 PM Go to last post
  15. Scrabble probability question

    I was playing Scrabble with my Dad earlier today. To decide who would play first we each drew a tile - the person with the tile closest to A would...

    Started by rbarker82‎, 06-25-2012 01:15 PM
    • Replies: 2
    • Views: 2,263
    06-25-2012, 01:21 PM Go to last post
  16. probability

    If 4 distinct balls are distributed over 4 distinct boxes. Each ball has a 90% probability of being seen in the box that it is in. Then what is the...

    Started by mark27‎, 06-25-2012 01:20 AM
    probability
    • Replies: 0
    • Views: 1,394
    06-25-2012, 01:20 AM Go to last post
  17. Conditional probability Question

    Hello, I'm trying to work out a conditional probability. I have two measurements of two variables (1) Start Time and (2) Distance. I've...

    Started by bradyj2‎, 06-22-2012 07:21 AM
    • Replies: 1
    • Views: 1,338
    06-22-2012, 10:31 AM Go to last post
  18. Seeking help with a condition probability question

    Hello, I have measurements of 3 variables (1) Journey start time (2) Distance travelled (3) Journey Time. I am looking to work out the...

    Started by bradyj2‎, 06-22-2012 05:48 AM
    • Replies: 0
    • Views: 1,187
    06-22-2012, 05:48 AM Go to last post
  19. How to generate a certain number of random numbers from a gamma distribution that sum

    Hello, Would anybody be able to advise me or tell me how you could generate a certain number of random numbers from a gamma distribution that sum...

    Started by bradyj2‎, 06-21-2012 03:42 PM
    • Replies: 1
    • Views: 2,009
    06-21-2012, 05:57 PM Go to last post
  20. skewness of a sum of correlated Bernoulli distributed variables

    Hello everybody, I've got n bernoulli distributed variables. Each of the variables is an indicator 1(Di) in another function L(i), representing...

    Started by thamisat‎, 06-21-2012 12:39 PM
    • Replies: 2
    • Views: 3,409
    06-21-2012, 05:25 PM Go to last post
  21. Homework problem, help me!

    Circuit boards are produced by a machine. Each board may turn out to be defective (Outcome D) with probability 0.1, good (Outcome D') with...

    Started by aimanR‎, 09-27-2010 06:10 PM
    • Replies: 4
    • Views: 4,577
    06-20-2012, 06:10 AM Go to last post
  22. Another joint density problem

    it seems that i cant understand the boundaries... the joint density function: f(u,v)= a , u^2 <= v <= 1 0 , else find a i...

    Started by wuid‎, 06-20-2012 02:57 AM
    • Replies: 2
    • Views: 1,353
    06-20-2012, 04:21 AM Go to last post
  23. find expected value problem

    Hi all i have problem with my h.w , i think the question is related more to math than to probability, but i'm sure someone here will find how to...

    Started by wuid‎, 06-19-2012 10:55 AM
    • Replies: 0
    • Views: 1,397
    06-19-2012, 10:55 AM Go to last post
  24. Have a probability question that's too complex for me to figure out :(

    I have 6 numbers randomly generated at the same time whose min and max will always be between 1 and 19, though the min may be higher and the max may...

    Started by Ravel‎, 06-18-2012 06:05 PM
    • Replies: 1
    • Views: 923
    06-18-2012, 06:12 PM Go to last post
  25. Which distribution to use?

    I think we should use the exponential distribution - can you confirm if I am right: A light bulb manufacturer advertises that "the average life of...

    Started by ramirez‎, 06-17-2012 12:46 PM
    • Replies: 0
    • Views: 2,326
    06-17-2012, 12:46 PM Go to last post
  26. Joint distribution ... Help!

    I have 1 previous exam sample question: (X,Y) has the following joint probability density function f(x,y)= 3(x+y) when ...

    Started by lenhhoxung‎, 06-16-2012 05:51 AM
    • Replies: 1
    • Views: 1,637
    06-16-2012, 12:19 PM Go to last post
  27. Probability from Z-score for a given population?

    Hi there, Apologies in advance for my lack of stats knowledge. We are using some predictive models that do assume a normal distribution but...

    Started by agro‎, 06-16-2012 01:48 AM
    • Replies: 0
    • Views: 1,386
    06-16-2012, 01:48 AM Go to last post
  28. Hypergeometric distribution - expected value derivation

    Hello, I just had a question regarding deriving the expected value of the Hypergeometric(N,M,n) distribution. I know that the expected value is...

    Started by GTaiko‎, 05-22-2012 06:40 PM
    • Replies: 3
    • Views: 4,450
    06-16-2012, 01:30 AM Go to last post
  29. Probability Help.

    Im not sure why I can't figure out these 2 problems. I got the first one right, and I'm using the same thought process to do the other 2, I just...

    Started by weedy1990‎, 06-15-2012 01:23 PM
    • Replies: 8
    • Views: 10,486
    06-15-2012, 06:22 PM Go to last post
  30. expectation of the distance between two points in a square

    Hi all, how can I find the expectation of the distance between any two points uniformly distributed in a square of side L. I need a mathematical...

    Started by nounuo‎, 06-07-2012 09:05 AM
    • Replies: 1
    • Views: 3,758
    06-15-2012, 05:17 PM Go to last post
  31. Mixed continuous / discrete probability question

    Dear forum, I am having a dreadful time making progress with the following problem, and would greatly appreciate any pointers you had. The...

    Started by s195404‎, 06-12-2012 01:40 PM
    • Replies: 1
    • Views: 1,607
    06-14-2012, 05:02 PM Go to last post
  32. Conditional expectation

    Good afternoon, I have to calculate the expected value of a logistic distribution given that the values are above a given constant (lets say 0). So...

    Started by bizan‎, 06-12-2012 08:06 AM
    conditional expectation, expected value, logistic
    • Replies: 1
    • Views: 3,910
    06-14-2012, 04:58 PM Go to last post
  33. Birthday Problem

    This is not the traditional birthday problem. Lets say I have 657 friends. What are the odds that none of them have a birthday today? This...

    Started by gagnonca‎, 06-13-2012 08:00 PM
    birthday problem
    • Replies: 3
    • Views: 1,788
    06-13-2012, 09:00 PM Go to last post
  34. Related Failures

    I need help classifying this problem. If you know how to go about it, I'd love to hear it, but I mainly need keywords to conduct careful research. ...

    Started by nik.shornikov‎, 05-27-2012 08:35 PM
    random process
    • Replies: 1
    • Views: 1,719
    06-11-2012, 11:29 AM Go to last post
  35. Help with Exponential Dist Problem.

    I'm questioning whether to use PDF or CDF for the following problem. The time in days between breakdowns of a machine is exponentially distributed...

    Started by skystreak‎, 06-10-2012 12:05 PM
    • Replies: 3
    • Views: 3,062
    06-10-2012, 09:17 PM Go to last post
  36. Poisson distribution- when lambda given as a %

    Hello! I'm new to this forum, and let me tell ya, stats as a summer class is not fun! Anyways, I think I know the answer to my question, but I...

    Started by free_radicals‎, 06-10-2012 08:12 PM
    • Replies: 4
    • Views: 3,461
    06-10-2012, 08:54 PM Go to last post
  37. Probabilities and variable Z

    The question was asked... For standard normal random variable Z, find the following probability P(Z=0.74). I looked in my book's table and found...

    Started by jessica1983‎, 06-09-2012 09:07 PM
    • Replies: 4
    • Views: 7,289
    06-10-2012, 05:31 PM Go to last post
  38. poisson question

    OK here is an exercise that i don't understand how to solve: imagine a balcony that attends client. For every 10 min. the number of people getting...

    Started by jumpydad‎, 06-03-2012 12:40 PM
    poisson distribution, probability
    • Replies: 1
    • Views: 1,535
    06-10-2012, 12:20 PM Go to last post
  39. Measure Variability of data points

    I'm struggling to find the appropriate solution to a project that I'm working on. I am trying measure the variability of lead time on products that...

    Started by mschweinzger‎, 06-06-2012 03:29 PM
    • Replies: 7
    • Views: 2,934
    06-08-2012, 08:17 AM Go to last post
  40. Basic Probability Question

    If I have the following data set, Event - Failure Frequency (failures/yr) 1 - 0.12 2 - 0.50 3 - 0.50 4 - 0.29 5 -...

    Started by mjm8110‎, 06-06-2012 06:16 PM
    • Replies: 0
    • Views: 1,315
    06-06-2012, 06:16 PM Go to last post
  41. Formula for determining # times to repeat an event to get Y % probability of success

    OK, I know, the title leaves a lot to be desired but it's the best I could do in the space allowed. It's been a while since I did any statistics,...

    Started by Richard2‎, 06-05-2012 03:13 PM
    • Replies: 2
    • Views: 1,767
    06-05-2012, 04:16 PM Go to last post
  42. Adding normal distribution - z-scores

    Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

    Started by kurt9090‎, 06-05-2012 07:36 AM
    • Replies: 5
    • Views: 8,549
    06-05-2012, 09:21 AM Go to last post
  43. Using a copula function when one of the correlations is not significant

    Hello, I have 4 variables: 1. Departure Time from Home 2. Distance travelled during the day 3. The number of trips made during the day 4....

    Started by bradyj2‎, 06-04-2012 12:15 PM
    • Replies: 4
    • Views: 2,320
    06-05-2012, 04:07 AM Go to last post
  44. Distribution of |X|/|Y|

    Hello I would like some help on this question: a)If X and Y are independent r.v.'s N(0,1) find the pdf of |X|/|Y|. My problem is working with...

    Started by Kol‎, 06-02-2012 01:55 PM
    • Replies: 1
    • Views: 2,178
    06-02-2012, 04:59 PM Go to last post
  45. hypothesis testing: car top speed vs two aerodynamic configurations

    but varying wind speed confounds results. I'm looking for a significant difference between designs. What keywords should I be searching on for...

    Started by Outlier‎, 12-02-2011 11:33 AM
    • Replies: 3
    • Views: 1,973
    06-02-2012, 10:57 AM Go to last post
  46. help with binomial distribution

    Hello, I have a problem with this binomial question..I will try to make it short a machine makes on average 1 error per hour and needs to be...

    Started by blaah‎, 06-01-2012 04:28 PM
    • Replies: 0
    • Views: 1,369
    06-01-2012, 04:28 PM Go to last post
  47. Larger Probability

    Hello all. I just have a question regarding larger probabilities. Small probabilities I understand are fairly straight forward: Eg: 65% of...

    Started by howzat_out‎, 06-01-2012 12:07 PM
    • Replies: 2
    • Views: 2,355
    06-01-2012, 02:43 PM Go to last post
  48. I need helpf with this one, for probability - binomial distribution

    According to a recent study, 38% of all women will suffer a hip fracture because of osteoporosis by the age of 85. If six women aged 85 are randomly...

    Started by miriam‎, 06-01-2012 09:26 AM
    • Replies: 4
    • Views: 8,578
    06-01-2012, 12:04 PM Go to last post
  49. Bayesian inference

    Hello, I am having trouble understanding Bayesian inference (all those parameters, data, prior/posterior distributions). It's all a little bit...

    Started by john83‎, 05-31-2012 03:07 PM
    • Replies: 0
    • Views: 2,154
    05-31-2012, 03:07 PM Go to last post
  50. Exponential or Lognormal: which distribution should I use?

    Hi! Which distribution should I use if my set of data is divided into subgroups and each subgroup is either lognormal or exponential? Please help,...

    Started by whattodo‎, 05-30-2012 05:38 AM
    • Replies: 0
    • Views: 4,207
    05-30-2012, 05:38 AM Go to last post
  51. About sigma field

    Can someone give some tips to prove the statement: C and D are two sets. If C belongs to D, then \sigma(C) belongs to \sigma(D). where...

    Started by egpivo‎, 05-30-2012 05:00 AM
    • Replies: 1
    • Views: 1,652
    05-30-2012, 05:17 AM Go to last post
  52. Probability in my exam

    Here is the scenario for my practice exam: "You have been hired by a firm which produces customised engineering machinery to provide some...

    Started by newbiestats‎, 11-13-2011 09:10 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 22,858
    05-30-2012, 01:34 AM Go to last post
  53. Is independence indpendent on measure?

    Is it possible that 2 sigma-algebras could be independent under one measure but not independent under another? Many thanks.

    Started by tuna‎, 05-25-2012 11:53 AM
    • Replies: 5
    • Views: 1,979
    05-25-2012, 04:16 PM Go to last post
  54. Why is a Dynkin system not a Pi-system?

    This appears to be the only difference between a sigma-algebra and a Dynkin system: Sigma-algebra is closed under countable union Dynkin system...

    Started by tuna‎, 05-25-2012 08:59 AM
    algebra, dynkin, pi-system, sigma
    • Replies: 0
    • Views: 1,602
    05-25-2012, 08:59 AM Go to last post
  55. Basic Question

    Ok the answer might be really obvious here but I am getting a blank at the moment. If there is a 20% chance of a child getting a disease from...

    Started by Wicket‎, 05-23-2012 11:35 PM
    • Replies: 2
    • Views: 1,474
    05-25-2012, 12:23 AM Go to last post
  56. Probability of winning analysing combinations

    Hello, this is my first post in this forum, so Im not sure if this question belongs to this topic. Well, here goes my problem: I have to know the...

    Started by tingo‎, 05-20-2012 09:01 PM
    • Replies: 0
    • Views: 1,235
    05-20-2012, 09:01 PM Go to last post
  57. Joint Probability of sum exponential random variables

    Thank you for help

    Started by tsobrian‎, 05-19-2012 12:12 PM
    • Replies: 1
    • Views: 1,866
    05-19-2012, 12:14 PM Go to last post
  58. Probability on 2 random events combined

    event A and B are not related but : if A happens then the event C has a probability W of happening. if B happens then the event C has a probability...

    Started by noobstats‎, 05-18-2012 02:45 PM
    combination, events, random
    • Replies: 2
    • Views: 2,113
    05-19-2012, 05:12 AM Go to last post
  59. expectation and integral

    Hi maybe a stupid question: Let X be a random variable depending on a parameter \xi . Further let f : \mathbb{R} \rightarrow \mathbb{R} be a...

    Started by statsdonkey‎, 05-18-2012 08:35 AM
    • Replies: 4
    • Views: 2,284
    05-18-2012, 02:05 PM Go to last post
  60. Branching process question

    Hi I have attached my question, I needed help on part ii). I don't know how compute P(N=n) Thanks

    Started by cjones‎, 05-17-2012 09:34 AM
    • Replies: 1
    • Views: 2,005
    05-18-2012, 12:52 AM Go to last post

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