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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: 30,253
    09-30-2005, 09:44 AM Go to last post
  1. Question regarding draws from a box

    Hi, I'm a little confused about the following problem: You draw twice without replacement from a box containing four tickets, labeled '1', '1',...

    Started by jessk‎, 10-19-2012 10:33 AM
    • Replies: 2
    • Views: 1,622
    10-19-2012, 11:22 AM Go to last post
  2. Do u know a statistical distribution with exponential moment generating function

    Hi When I involve with a problem about limiting distribution of Gama, I encounter with below moment generating function:...

    Started by bahri719‎, 10-19-2012 02:01 AM
    • Replies: 1
    • Views: 1,060
    10-19-2012, 03:00 AM Go to last post
  3. Covariance of a linear comb. of independent variables

    U = y1 - 2y2 + y3 W = 3y1 + y2 E = 1, E = 2, E = -1, Var = 1, Var = 3, Var = 5 Var(U) = 12, Var(W) = 12 ;I hope y1, y2, y3 are Independent RV's...

    Started by alias‎, 10-18-2012 07:05 PM
    • Replies: 2
    • Views: 1,735
    10-18-2012, 10:48 PM Go to last post
  4. Probability & (possibly) Binomial Distribution

    Problem: A certain drug causes kidney damage in 1% of patients. Suppose the drug is to be tested on 50 patients. Find the probability that: (a)...

    Started by TwistedEsoterix‎, 10-18-2012 12:44 PM
    • Replies: 2
    • Views: 4,649
    10-18-2012, 06:11 PM Go to last post
  5. distributions of Markov Chain

    Hello!I am very confused with the terms initial distribution,limiting distribution and stationary distribution of a Markov Chain. Is initial...

    Started by violette‎, 10-18-2012 09:38 AM
    • Replies: 1
    • Views: 1,349
    10-18-2012, 12:37 PM Go to last post
  6. Can some one please solve part b and c of this probability question

    Can some one please solve part b and c of this probability question?? Thanks The Myers Briggs type indicator has been used to measure...

    Started by srksaloo‎, 10-18-2012 11:47 AM
    • Replies: 3
    • Views: 1,584
    10-18-2012, 12:00 PM Go to last post
  7. Probability & Binomial Distribution?!?!

    I just want to know if my line of thinking is correct: Observational unit: Fruitflies 30 % black mutated body color 70 % gray nonmutated body...

    Started by TwistedEsoterix‎, 10-18-2012 09:58 AM
    • Replies: 1
    • Views: 2,771
    10-18-2012, 10:07 AM Go to last post
  8. Horse Racing Problem

    I break down horse races into two horse races and my probabilities are fairly accurate. I have been wrestling with how to convert all these...

    Started by LemonDropKid‎, 09-20-2012 11:11 PM
    • Replies: 3
    • Views: 3,207
    10-17-2012, 10:02 PM Go to last post
  9. Exponential Distribution - Moment Generating Function

    I have a rate of .5, and three sample size scenarios (16,36,100). I am trying to find the exact distribution of the average time by using an MGF. ...

    Started by simplemts‎, 10-17-2012 04:33 PM
    • Replies: 3
    • Views: 3,806
    10-17-2012, 07:37 PM Go to last post
  10. Independency and flipping a coin that might be a biased coin

    Setup: There are two coins in an urn: A fair coin and a biased coin that lands Heads with probability q. At time 0, we choose a coin at random, and...

    Started by StatsBill‎, 10-17-2012 02:07 PM
    biased coin, independency
    • Replies: 0
    • Views: 1,075
    10-17-2012, 02:07 PM Go to last post
  11. Verification & Specification

    Hi, I've been given a bunch of problems for homework and I'm stumped on the last one, any assistance will be greatly appreciated. Verify that: ...

    Started by dots‎, 10-16-2012 08:13 PM
    • Replies: 2
    • Views: 1,479
    10-17-2012, 12:21 PM Go to last post
  12. Need help with contingency tables

    I'll do all the math in the contingency tables but I got this question and I'm stumped on how I should set the tables up, any advice would help a...

    Started by brody134‎, 10-16-2012 09:38 PM
    contingency tables, help please, probability
    • Replies: 0
    • Views: 1,285
    10-16-2012, 09:38 PM Go to last post
  13. convergence in probability and strong convergence in the discrete case

    Show that if you have convergence in probability, then you also have strong convergence in the discrete case. I know that the discrete case means...

    Started by phychoflip29‎, 10-15-2012 07:48 PM
    • Replies: 4
    • Views: 2,263
    10-16-2012, 03:52 AM Go to last post
  14. Bayesian probability question about Dirichlet prior distributions

    Hi there, I have a question about Bayesian probability. I have a list of the starting times of journeys. I binned the data into 15 minute...

    Started by bradyj2‎, 10-15-2012 12:03 PM
    • Replies: 2
    • Views: 1,698
    10-16-2012, 03:38 AM Go to last post
  15. Uniform Distribution with Convergence

    I am trying to Prove that {Wn} converges in distribution to W. Wn has the following density: (1 + x/n) / (1 + 1/2n) In essence, I am trying to...

    Started by simplemts‎, 10-16-2012 01:34 AM
    • Replies: 8
    • Views: 1,876
    10-16-2012, 02:32 AM Go to last post
  16. Post Find the Probability that the system fails

    The figure below is a representation of two subsystems operating in parallel. Each subsystem has two components that operate in series. Subsystem A...

    Started by Rkaur‎, 10-15-2012 10:26 PM
    failure, probability, statistics
    • Replies: 1
    • Views: 1,782
    10-16-2012, 02:19 AM Go to last post
  17. Gamma, Exponential, Oh My!

    I have the answer already, but I wan't to understand how this actually works. "Suppose that X, given Y = y, is distributed Gamma(a, y) and that...

    Started by simplemts‎, 10-15-2012 09:32 PM
    • Replies: 1
    • Views: 1,744
    10-15-2012, 09:57 PM Go to last post
  18. Unhappy Need help with Uniform probability distribution

    Hey guys... I'm sort of confused about these two problems. If you guys can help me out that would be great. Problem: Suppose X is a random...

    Started by alex123‎, 10-15-2012 12:07 PM
    distribution, probability, random variable, unifrom
    • Replies: 2
    • Views: 2,549
    10-15-2012, 12:22 PM Go to last post
  19. Bayesian conclusion scale with uneven data distribution. Possible?

    I have two sets of data distribution between 0 to 100%. I was thinking of using the Bayes theorem of explaining the data distribution. More info on...

    Started by mystvearn‎, 10-15-2012 04:25 AM
    • Replies: 4
    • Views: 1,860
    10-15-2012, 06:11 AM Go to last post
  20. Central Limit Theorem and Exponential Distribution

    Exponential Distribution with lambda = 1/2. Use the central limit theorem to estimate the probability that the average service time of the first n...

    Started by simplemts‎, 10-15-2012 02:30 AM
    • Replies: 1
    • Views: 3,883
    10-15-2012, 02:33 AM Go to last post
  21. Computing pobabilities for any normal probability Dist.

    Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

    Started by 1Moretime‎, 10-14-2012 11:23 AM
    • Replies: 2
    • Views: 4,712
    10-14-2012, 03:23 PM Go to last post
  22. Independent events occurring simultaneously

    Hey guys, I saw a similar question on the site, but still need some help with my own. Here it is: Consider a double computer intruder detection...

    Started by deutscherhoff‎, 10-13-2012 11:55 PM
    alarm, events, independent, intruder, simultaneous
    • Replies: 2
    • Views: 2,714
    10-14-2012, 02:32 PM Go to last post
  23. Conditional Expectation

    I will keep it simple... Suppose the Joint PMF is: 1/2 x = -4, y = 1 1/2 x = 6, y = 7 I have already computed several actual values for...

    Started by simplemts‎, 10-13-2012 06:10 PM
    • Replies: 1
    • Views: 1,296
    10-14-2012, 12:04 PM Go to last post
  24. sampling - distribution of sample mean

    How do I solve this? I'm a little confused by the question itself too. A student's performance is equally good in both subjects. The marks she might...

    Started by manman‎, 10-14-2012 06:04 AM
    probability distribution, sampling distribution
    • Replies: 1
    • Views: 1,321
    10-14-2012, 11:53 AM Go to last post
  25. Help with question in combinatorics

    Hi, Got the following question, I'm sure it's pretty simple but can't get to a solution :( There's a monthly employment survey, conducted by...

    Started by Giladr‎, 10-14-2012 03:36 AM
    combinatorics
    • Replies: 1
    • Views: 1,459
    10-14-2012, 11:49 AM Go to last post
  26. Deciding how many averages are sufficient

    Hi, I am performing the following operations: All vectors have the same length. Step 1. Define a vector of constants X Step 2. Create a...

    Started by sigma‎, 10-11-2012 03:08 PM
    • Replies: 3
    • Views: 1,791
    10-13-2012, 10:13 AM Go to last post
  27. Binomial distributions

    A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a)...

    Started by klsybrns‎, 10-12-2012 01:33 PM
    • Replies: 1
    • Views: 4,443
    10-12-2012, 09:25 PM Go to last post
  28. estimating population from hash table fill rate

    Apologies if this is the wrong forum, but it looks reasonably close. I have a practical problem to estimate the number of actual entries in a...

    Started by gbuchana‎, 10-11-2012 12:27 PM
    • Replies: 3
    • Views: 1,851
    10-12-2012, 08:13 PM Go to last post
  29. Need help showing my work

    A new study by Square Trade indicates that smartphones are 50% more likely to malfunction than simple phones over a 3 year period. Of smartphone...

    Started by Kayla<3‎, 10-11-2012 03:57 PM
    • Replies: 1
    • Views: 1,940
    10-12-2012, 04:40 AM Go to last post
  30. Probabilty of Hard Drive Failure

    Thank you in advance. It's been a while since I've engaged in any probability problems, so I appreciate your help. Problem: I have two hard drives...

    Started by Saltjunkie‎, 10-11-2012 11:24 PM
    • Replies: 1
    • Views: 3,583
    10-12-2012, 04:39 AM Go to last post
  31. Maximum Likelihood Estimate For A Poisson Mass Function ...

    with mean μ is ((μ ^ x) * ((exp) ^ -μ)) / x! The log likelihood is x * log(μ) − μ. (Answer) How do I arrive at the log likelihood provided? ...

    Started by dorkboy‎, 10-11-2012 02:36 PM
    mle, poisson mass function
    • Replies: 2
    • Views: 1,449
    10-11-2012, 03:00 PM Go to last post
  32. Please help me to judge if a 'random' draw was fixed !

    40 teams are taking place in a knock-out competition in which there is no seeding. They all have rankings determined by previous performance. The...

    Started by mazza47‎, 10-11-2012 03:49 AM
    • Replies: 1
    • Views: 1,117
    10-11-2012, 09:26 AM Go to last post
  33. Post how can i calculated the expected duration?

    hi, my name is ghder alshreef, i'm a searcher from Egypt and my intersted about stochastic process specially random walk models, and i need to...

    Started by ghder‎, 10-11-2012 03:58 AM
    • Replies: 0
    • Views: 2,290
    10-11-2012, 03:58 AM Go to last post
  34. Probability Question- Positive/Negative Disease

    One percent of all individuals in a certain population are carriers of a particular disease. A diagnostic test for this disease has a 97 % detection...

    Started by Lley‎, 10-10-2012 08:18 PM
    • Replies: 4
    • Views: 4,577
    10-10-2012, 11:58 PM Go to last post
  35. Tricky question on probability?!

    A fair dice with 6 sides is rolled a certain number of times and the numer 1-6 is recorded each time it is rolled. Which of the following sequences...

    Started by nyo‎, 10-10-2012 05:40 PM
    • Replies: 13
    • Views: 3,215
    10-10-2012, 08:35 PM Go to last post
  36. Expected Value - Multiplication

    Given the following input: (E + E) * (E+E) Is my output: EE + EE + EE + E^2 I know if I multiply INSIDE the expected value ( E = E + E),...

    Started by simplemts‎, 10-10-2012 07:15 PM
    • Replies: 2
    • Views: 3,992
    10-10-2012, 07:19 PM Go to last post
  37. Poisson distribution help please! :)

    I can't figure this one out. Can someone help me please? Thanks! One model for plant competition assumes that there is a zone of resource depletion...

    Started by Kayla<3‎, 10-10-2012 06:13 PM
    • Replies: 1
    • Views: 3,280
    10-10-2012, 06:34 PM Go to last post
  38. What is variance of X-bar^2, if X ~ N(theta, sigma^2), sigma is known?

    I want to calculate variance of X-bar^2, (mean of X)^2, when Xi ~ Normal(theta, sigma^2) and sigma is known. plz help.

    Started by Yihyunsoo‎, 10-09-2012 12:09 PM
    • Replies: 3
    • Views: 6,885
    10-10-2012, 10:02 AM Go to last post
  39. Help...

    I'm not sure how to set up this binomial probability problem. I hope there is a good probability that someone can point me in the right direction. ...

    Started by allan‎, 10-09-2012 02:54 AM
    • Replies: 4
    • Views: 6,114
    10-09-2012, 09:55 PM Go to last post
  40. Probability of selecting buckets with items

    Given n buckets, each bucket containing m items, we want to select k items. Selecting an item means that the corresponding bucket is selected too. ...

    Started by RandomVariable‎, 10-08-2012 09:55 PM
    combinatorics, probability
    • Replies: 7
    • Views: 1,931
    10-09-2012, 09:05 AM Go to last post
  41. Probability after being given an initial condition

    This is a question I have received on my test and I am not sure whether or not my answer is correct. question: you are given 3 bags. First bag...

    Started by alaboudi‎, 10-08-2012 08:55 PM
    probability, sequential probability
    • Replies: 1
    • Views: 1,590
    10-08-2012, 11:44 PM Go to last post
  42. Elementary probability question (combinations)

    A set of plastic picnic cutlery is mixed in a bag. There are 4 brown spoons, 5 green forks, 6 brown knives, 3 blue forks and 7 pink spoons. ...

    Started by Nellen2222‎, 10-08-2012 01:45 PM
    • Replies: 2
    • Views: 1,811
    10-08-2012, 04:51 PM Go to last post
  43. Poisson distribution question on lambda

    An office printer has a paper jam on average 2 times in 3 weeks. THe number of paper jamsfollows a poisson distribution Findd the probabilitythat...

    Started by Nellen2222‎, 10-07-2012 08:31 PM
    • Replies: 5
    • Views: 2,689
    10-08-2012, 06:32 AM Go to last post
  44. Bionomial distribution:expected value problem question

    : The FBI Standard survey of crimes shows that for about 80% of all property crimes, the criminals arenever found and the case is never solved....

    Started by Nellen2222‎, 10-07-2012 06:19 PM
    • Replies: 3
    • Views: 4,695
    10-08-2012, 04:48 AM Go to last post
  45. Moment Generating Function (DISCRETE)

    P(X = 2) = 1/2 P(X = 5) = 1/3 P(X = 7) = 1/6 Compute Mx(s) for s an element of Real Numbers. I am under the impression that the Moment...

    Started by simplemts‎, 10-08-2012 12:41 AM
    • Replies: 3
    • Views: 2,012
    10-08-2012, 01:42 AM Go to last post
  46. Will two Independent Variables transformed into two functions remain independent?

    X & Y are independent variables. X ~ Bernoulli(1/2), Y ~ Bernoulli(1/3). Let Z = X + Y and W = X - Y. Compute Cov(Z,W) and Corr(Z,W). Am I...

    Started by simplemts‎, 10-07-2012 05:56 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,045
    10-07-2012, 11:36 PM Go to last post
  47. Hi Probability experts..... Can you solve this problem.

    Hi lads, I'm looking to solve this probability problem. Nobody i've given it to has solved it yet, and I'm a maths teacher, and I can't solve it....

    Started by NualaJ‎, 10-05-2012 09:33 AM
    higher level, leaving cert, probability
    • Replies: 2
    • Views: 2,386
    10-07-2012, 11:23 AM Go to last post
  48. Expected Value - Binomial and Poisson

    EDIT: I have confirmed the answer is correct, help is no longer needed. Thank you. I think I have this right and am just looking for a 2nd set of...

    Started by simplemts‎, 10-07-2012 12:59 AM
    • Replies: 1
    • Views: 1,735
    10-07-2012, 01:11 AM Go to last post
  49. Math Symbols - R1 --> R2

    What does the symbol R mean in the following description: "Let X be a discrete random variable, and let g : R^1 -> R^1 be some function ... " ...

    Started by simplemts‎, 10-07-2012 12:11 AM
    • Replies: 4
    • Views: 11,404
    10-07-2012, 12:34 AM Go to last post
  50. Question about mutually exclusive probability

    How do i find mutually exclusive probability? it says in my book that if p(A or B) = p(a) + p(b) then the events are mutualy exclusive. Or does it...

    Started by Nellen2222‎, 10-05-2012 08:26 PM
    • Replies: 14
    • Views: 6,784
    10-06-2012, 08:19 PM Go to last post
  51. Probability help sovling a problem.

    When the child is between 29 and 53 months, for each hour of TV watched per week, waist circumference increases by a mean of 0.43 mm. This increase...

    Started by Nellen2222‎, 10-05-2012 03:51 PM
    • Replies: 1
    • Views: 1,253
    10-05-2012, 03:53 PM Go to last post
  52. What test can predict the outcome of two teams with different win percentages?

    There are two teams in a ten team league. Team A has an overall win percentage of .688 Team B has an overall win percentage of .523 In...

    Started by TI-83‎, 10-05-2012 12:33 PM
    • Replies: 2
    • Views: 978
    10-05-2012, 02:51 PM Go to last post
  53. JaVale McGee

    Hey friends. I decided that being an NBA all-star, author, rapper, actor, father, role model, PhD, and Nobel Prize winner wasn't enough. So I...

    Started by Shaq's Left Nut‎, 10-03-2012 08:17 PM
    • Replies: 7
    • Views: 1,724
    10-05-2012, 01:10 PM Go to last post
  54. Question on probabiltiy terminology

    Just wondering, Does "Neither" In probability always mean p( a and b)? Consider the following non-mutually-exclusive event A basket of 14...

    Started by Nellen2222‎, 10-05-2012 03:44 AM
    • Replies: 1
    • Views: 1,036
    10-05-2012, 08:49 AM Go to last post
  55. comparing pass/fail rates among teachers

    Suppose there are 1,050 students all age 15 and each student is randomly assigned to one of seven different teachers. However, teachers are allowed...

    Started by greg30043‎, 10-01-2012 10:20 PM
    • Replies: 6
    • Views: 4,866
    10-05-2012, 08:15 AM Go to last post
  56. Statistics normal distribution question

    It has been found that to much TV increases a childs waist size When the child is between 29 and 53 months, for each hour of tv watched per week,...

    Started by Nellen2222‎, 10-04-2012 01:23 PM
    • Replies: 1
    • Views: 1,205
    10-04-2012, 02:17 PM Go to last post
  57. smarties

    Hi there, You have a bag of 20 smarties(chocolate candies), the smarties have 8 different colours. We know that the fill process of the bag in the...

    Started by Topper‎, 10-04-2012 06:00 AM
    • Replies: 1
    • Views: 1,106
    10-04-2012, 07:35 AM Go to last post
  58. pop quiz

    Shaq is studying for a nursing qualifying exam that will consist of 20 distinct questions selected at random from a list of 40 that the professor has...

    Started by Shaq's Left Nut‎, 10-04-2012 12:10 AM
    • Replies: 1
    • Views: 1,457
    10-04-2012, 02:52 AM Go to last post
  59. a discrete RV pdf

    The pdf of a discrete random variable is the following: f(x) = 36/(49x^2), for x = 1,2,3 What is the cdf of x? I'm not sure but I think...

    Started by Shaq's Left Nut‎, 10-03-2012 10:43 PM
    • Replies: 1
    • Views: 892
    10-03-2012, 10:58 PM Go to last post
  60. Some Help

    Please. I think I am having a mental cramp right now. I want to know when are the times you subtract 1-so and so? The examples are below. Mean...

    Started by PSG‎, 10-02-2012 11:34 PM
    • Replies: 1
    • Views: 4,541
    10-03-2012, 09:14 PM Go to last post

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