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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: 30,307
    09-30-2005, 09:44 AM Go to last post
  1. 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

    Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

    Started by cridex‎, 12-29-2011 12:08 PM
    2 Pages
    1 2
    probability question
    • Replies: 16
    • Views: 7,238
    12-30-2011, 02:39 PM Go to last post
  2. Moment Generating Function

    If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

    Started by Darktranquillity‎, 02-22-2012 02:26 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,734
    02-23-2012, 01:13 PM Go to last post
  3. Difficulty setting up double integrals for Joint Distributions

    I'm struggling to set up the correct range when calculating probabilities of joint distributions....anyone have any recommended reading or sites that...

    Started by hedgie‎, 09-27-2012 02:17 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,016
    09-30-2012, 03:24 AM Go to last post
  4. 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: 3,049
    10-07-2012, 11:36 PM Go to last post
  5. Removing an outlier DECREASES correlation??

    Here's my data. Note the "outlier" X LN(X) Y 4 1.386294361 0.107543212 6 1.791759469 3.289563593 7 1.945910149 2.058949066...

    Started by MrGibbage‎, 04-19-2010 01:38 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 37,264
    04-24-2010, 07:17 PM Go to last post
  6. counting rule?

    20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

    Started by SadieKhan‎, 09-19-2010 11:51 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,171
    09-20-2010, 10:52 AM Go to last post
  7. Question problem on gamma distribution

    let X_1,X_2,......,X_n be 'n' i.i.d random variables, each following gamma (1,3) distribution. show that P(X_1+X_2+.....X_n > 3(n-\sqrt{n}) ) >...

    Started by Sambit‎, 10-31-2010 08:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,793
    11-01-2010, 07:15 AM Go to last post
  8. Normal distribution problems

    I'm having some issues with a few questions on my practice final. Let X be a normally distributed random variable with expectation = -1 and...

    Started by player‎, 12-14-2010 10:37 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,638
    12-20-2010, 02:38 PM Go to last post
  9. Proof of covariance of a weak stationary stoch. process.

    Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

    Started by c2q‎, 02-05-2012 02:43 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,797
    02-05-2012, 04:22 PM Go to last post
  10. Can't seem to solve this p(x+y>1)

    Given f(x,y) = 3x/2 for 0<x<1 , -x<y<x Find P(x+y>1) .

    Started by saternal‎, 03-31-2012 04:43 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,476
    04-01-2012, 07:13 PM Go to last post
  11. [SOLVED] Probability problem help(how to do)

    A gardener has a bag with 12 wildflower seeds saved from wildflowers in summer. She plants 4 of them at random in a pot to see if they will grow...

    Started by Neelo‎, 09-22-2012 05:53 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,264
    09-22-2012, 08:21 PM Go to last post
  12. True odds vs Bookmaker odds?

    Hello, I'm new to the forum and very excited to be here. However I have a question that brought me here. i attach a picture to show more clearly what...

    Started by VaBanque‎, 11-06-2014 02:01 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,267
    11-24-2014, 01:55 AM Go to last post
  13. An odd payout question...Please Help!

    I have a problem that I am trying to solve. I think my answer is correct, but I am not 100% sure. Any help you could provide would be greatly...

    Started by NCSUStudent‎, 11-03-2015 07:16 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,733
    11-05-2015, 01:16 AM Go to last post
  14. Probabilistic Graphical Model

    I created a data frame from what the instructor gave me for my homework: > cbind(Person.ID, Lerner.Alum, KJ, R) Person.ID Lerner.Alum KJ R...

    Started by DV Man‎, 11-06-2016 05:40 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,840
    11-09-2016, 02:32 PM Go to last post
  15. Overlaping Normal Curves

    Folks, In an ecological model, I must compute the overlap of two standardized normal curves (correct term? ... areas of 1, but means and...

    Started by Rboone2020‎, 09-28-2006 05:14 PM
    • Replies: 14
    • Views: 4,755
    10-05-2006, 11:03 AM Go to last post
  16. Need help on problem BIG TIME!

    Each trading day the value of a particular stock goes up one unit with probability 0.3, stays the same with probability 0.5 or else goes down one...

    Started by JoeyStorm‎, 03-18-2008 02:29 AM
    • Replies: 14
    • Views: 3,556
    03-18-2008, 11:16 PM Go to last post
  17. Hopefully an easy 'first post'!

    Hi All. I'm a newbie to the forums, and will hopefully introduce myself with an eay-enough question on probability! OK, here goes: I have...

    Started by madnesstiger‎, 09-05-2008 07:28 AM
    • Replies: 14
    • Views: 5,130
    09-09-2008, 03:01 PM Go to last post
  18. Question Help with A HOMEWORK PROBLEM

    Hello to all Daryl shuffles a standard deck of cards (13 cards in each of four suits) and draws one card. Then Daryl replaces the card, shuffles...

    Started by Lyly‎, 01-09-2009 08:38 PM
    • Replies: 14
    • Views: 4,417
    01-12-2009, 10:36 AM Go to last post
  19. X=0 almost surely => E(X)=0

    Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

    Started by kingwinner‎, 07-07-2009 10:05 PM
    • Replies: 14
    • Views: 4,541
    07-20-2009, 12:59 AM Go to last post
  20. E[MSE] simple linear regression

    Hi All- I am trying to figure out how to prove that MSE = SSE/n-2 is an unbiased estimator of sigma^2 in simple linear regression. I have that...

    Started by B_Miner‎, 10-01-2009 07:42 PM
    sigma^2, unbiased estimator
    • Replies: 14
    • Views: 41,659
    02-02-2013, 03:44 AM Go to last post
  21. need help with proof issues

    1) given: (1+x)^n =SUM nCk X^k, prove that SUM nCk p^k q^n-k =1,where p+q=1 2)prove the general law of addition:P(E1 U E2 U......U En)=SUM...

    Started by sajee3a‎, 09-13-2010 02:28 PM
    • Replies: 14
    • Views: 4,873
    09-14-2010, 04:04 PM Go to last post
  22. Question Confused About Probability?

    Hey all, I'm currently a stats student and i have run into confusion about some questions pertaining to probability. I have attempted the following...

    Started by Jeff_McD18‎, 01-19-2011 10:26 PM
    probability question
    • Replies: 14
    • Views: 4,684
    01-20-2011, 12:06 PM Go to last post
  23. Probability question

    I read the sticky in this section about trying the problem before posting the question but I don't know where to begin on this problem. Any help...

    Started by USMstudent85‎, 04-03-2011 12:47 PM
    • Replies: 14
    • Views: 11,656
    04-03-2011, 04:15 PM Go to last post
  24. r-value > Probability

    I have two wrestlers who are going to arm-wrestle. I want to try to predict who will win based on their previous fights against other opponents....

    Started by cmarkc‎, 08-19-2011 08:37 AM
    • Replies: 14
    • Views: 7,047
    08-24-2011, 06:14 AM Go to last post
  25. need help to calculate variance of sales

    Hi, I'm trying to calculate numerical value of the variance of sales, and the probability of a sale greater than 6300 cans. but it seems wrong...

    Started by meriksso‎, 09-19-2011 10:46 PM
    probability question, variance, z-table
    • Replies: 14
    • Views: 6,781
    09-21-2011, 07:18 PM Go to last post
  26. Three shooters, probability that two of them hits

    I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

    Started by 8Julio‎, 10-20-2011 01:26 PM
    • Replies: 14
    • Views: 5,238
    10-24-2011, 01:18 AM Go to last post
  27. probability of winning with every failed attempt

    Hello, I am trying to figure out what the probability of "losing" on a task is after every failed attempt, where each time there is no evidence of...

    Started by capn‎, 11-01-2011 10:59 AM
    • Replies: 14
    • Views: 2,863
    11-01-2011, 01:36 PM Go to last post
  28. Binomial

    machine has 3 wheels each with 40different numbers, the problem need to find the probabilty of have 3 apples in the case where 1) 3 times in...

    Started by Matt‎, 12-06-2011 09:28 AM
    • Replies: 14
    • Views: 2,815
    12-07-2011, 07:02 AM Go to last post
  29. Post Random Variable X

    So this question is on my practice final, and the professor provided the work for how to solve it and I cannot figure it out. Suppose that the...

    Started by iain08‎, 12-13-2011 07:34 PM
    random variable, standard deviation, stats
    • Replies: 14
    • Views: 6,553
    12-13-2011, 09:03 PM Go to last post
  30. Bayesian updating over multiple distributions

    Say I believe a basketball player's likelihood distribution of making a shot is affected by his distance from the hoop, how well he is being...

    Started by statsanimal‎, 01-17-2012 06:10 PM
    • Replies: 14
    • Views: 3,214
    01-22-2012, 04:00 PM Go to last post
  31. 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: 6,795
    10-06-2012, 08:19 PM Go to last post
  32. Independent die roll

    Hi i have this problem, where a fair die is rolled until the same number occurs 2 successive times. Let X be the trial on which the repeat occurs,...

    Started by ITman95‎, 11-20-2013 05:09 PM
    • Replies: 14
    • Views: 2,227
    11-22-2013, 08:59 AM Go to last post
  33. Bayesian and Probability

    A certain disease has infected 2% of the population. The firm has annoucned that 90% of those infected will show a postive test result , while 95% of...

    Started by xenovia‎, 03-17-2015 07:26 PM
    • Replies: 14
    • Views: 2,562
    03-18-2015, 03:39 PM Go to last post
  34. Urgent: Probability of having Lyme Disease and Bayes theorem

    I recently found a deer tick on me (had been there for several days). I have no symptoms. My Dr. says I could ignore it or take a course of...

    Started by ihf‎, 03-13-2017 09:44 AM
    bayes
    • Replies: 14
    • Views: 1,852
    03-13-2017, 06:02 PM Go to last post
  35. Question Probability

    Ok I am very new to stats and am very confused. I went to the examples board and now am even more confused. Here is the problem. Ok they offer a...

    Started by jaben‎, 11-15-2005 11:35 AM
    • Replies: 13
    • Views: 5,894
    11-15-2005, 03:11 PM Go to last post
  36. Red face Determining Joint PDFs, and Marginal PDFs

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:50 AM
    • Replies: 13
    • Views: 12,886
    05-15-2008, 01:04 AM Go to last post
  37. stupid question sample variance

    Hi there, I have a rather stupid question suppose I have the values of the random variable X: for example. (That's right the third...

    Started by leo nidas‎, 12-13-2008 08:13 AM
    • Replies: 13
    • Views: 5,359
    12-15-2008, 11:44 AM Go to last post
  38. Method of Moments, MLEs, and Standard Errors

    Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random...

    Started by sweetpotatofry‎, 02-05-2010 01:13 PM
    • Replies: 13
    • Views: 14,019
    02-07-2010, 04:13 PM Go to last post
  39. Please help me with this problem

    The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and...

    Started by davidmav19‎, 10-27-2010 06:21 PM
    • Replies: 13
    • Views: 6,320
    10-27-2010, 09:12 PM Go to last post
  40. How to get this number?

    a) Variant P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27 P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4 P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33 expected value ( I do not know how...

    Started by Aauusteja‎, 11-22-2010 10:51 AM
    • Replies: 13
    • Views: 3,589
    11-24-2010, 12:16 PM Go to last post
  41. Cumulative Beta Distribution Function Help

    Hi everyone, I was wondering if someone could help me figure out how this function works. My problem is not that I need homework help, it's that...

    Started by idkstats14‎, 12-22-2010 02:21 PM
    • Replies: 13
    • Views: 12,633
    05-05-2014, 04:07 AM Go to last post
  42. conditional binomial is a poisson distribution

    Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

    Started by exuberant‎, 12-24-2010 09:28 AM
    • Replies: 13
    • Views: 22,197
    10-21-2015, 04:01 PM Go to last post
  43. A question about sampling

    Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

    Started by BigBugBuzzz‎, 11-11-2011 10:51 PM
    sampling, variance
    • Replies: 13
    • Views: 3,740
    04-27-2012, 09:52 AM Go to last post
  44. Monte carlo conditioning

    I am trying to learn how to reduce variance with conditioning. page 15 in these lecture notes: http://www.columbia.edu/~mh2078/MCS_Var_Red1.pdf ...

    Started by alf‎, 11-23-2011 04:02 PM
    • Replies: 13
    • Views: 3,044
    11-26-2011, 10:43 AM Go to last post
  45. *Rate of Ruin & Optimal N

    For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

    Started by coolcat‎, 11-26-2011 02:53 AM
    • Replies: 13
    • Views: 3,881
    11-28-2011, 12:21 PM Go to last post
  46. hi, can anyone please help me with this question?

    An insurance company's records suggest that experienced drivers (those aged over 21) submit claims at a rate of 0.1 per year, and inexperienced...

    Started by navaniDW‎, 01-16-2012 11:04 PM
    • Replies: 13
    • Views: 2,900
    01-17-2012, 10:31 PM Go to last post
  47. 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: 3,221
    10-10-2012, 08:35 PM Go to last post
  48. Two Random Variables Normal Distribution

    X1 ~ N(3,2^2), X2 ~ N(-8, 5^2) Let U = X1 - 5X2 Let V = -6X1 + CX2, where C is constant. (a) What are the distributions of U and V? I know U ~...

    Started by simplemts‎, 10-19-2012 03:37 PM
    • Replies: 13
    • Views: 4,615
    10-19-2012, 11:00 PM Go to last post
  49. Cool Odds of a certain 5 character string occurring in a random string of 512.

    I work in security and recently had a false positive happen where a certain word that was being tested occurred in the session id. Matching is not...

    Started by johnebgood‎, 11-15-2012 02:55 PM
    occurrence, odds, security, string, substring
    • Replies: 13
    • Views: 2,982
    11-16-2012, 09:51 PM Go to last post
  50. is the dice average?- theory discussion

    i throw a dice 300times. attahced picture is the result. the question is whether the dice is average? if i do not use any tool, the 5points face is...

    Started by nicegirl‎, 09-27-2014 10:33 PM
    • Replies: 13
    • Views: 2,369
    09-28-2014, 10:40 PM Go to last post
  51. Simple Bernoulli question

    I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It...

    Started by noetsi‎, 10-10-2014 04:54 PM
    • Replies: 13
    • Views: 3,447
    10-13-2014, 03:24 PM Go to last post
  52. Estimating a distribution

    Hi, Suppose I had some bags containing a large number of black and white marbles. Each bag has a uniform distribution, but I don't know in advance...

    Started by dryguy‎, 12-07-2006 12:46 PM
    • Replies: 12
    • Views: 5,015
    08-08-2011, 02:36 AM Go to last post
  53. Probabilty of picking higher number

    I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

    Started by coolant‎, 07-23-2008 06:49 PM
    • Replies: 12
    • Views: 3,545
    08-28-2008, 12:02 AM Go to last post
  54. Binomial Formula ?

    Hi everyone, I'm absolutely going crazy trying to figure this problem out, and I know the answer LOL..I just can't figure out how they got it. Using...

    Started by desmoface‎, 10-18-2008 11:54 AM
    • Replies: 12
    • Views: 3,578
    10-19-2008, 10:25 PM Go to last post
  55. Help! First time taking Stats and soooo confused!

    I'm taking Statistics online and every week I can barely get through the assigned problems. I'm not sure how to even begin figuring out this...

    Started by Midnightedge21‎, 10-19-2008 01:05 PM
    • Replies: 12
    • Views: 5,447
    11-06-2008, 09:53 AM Go to last post
  56. I still need help please

    Ok, so I am still working on this freaking problem. Can someone help me please. It states that the scenario is normally distributed with a mean price...

    Started by BestNurse‎, 12-12-2009 08:42 PM
    • Replies: 12
    • Views: 22,995
    12-14-2009, 09:10 PM Go to last post
  57. Probability of an Event

    There is probably a very simple answer to this, but please help a stats novice. I am trying to determine the probability of an event occurring in...

    Started by jwindebank‎, 02-02-2010 08:52 PM
    • Replies: 12
    • Views: 9,307
    02-03-2010, 09:00 PM Go to last post
  58. Expected Value Problem

    The heights of all male students in a university have mean 170 centimetres and standard deviation 10 centimetres. Three male students are randomly...

    Started by vegluv‎, 10-09-2010 08:41 PM
    • Replies: 12
    • Views: 6,911
    10-17-2010, 10:23 PM Go to last post
  59. Probability of 2 Heads Question

    I came across an interesting and counter-intuitive problem in my statistics course recently and wanted to share it with you guys to see if you could...

    Started by Link‎, 10-26-2010 10:59 AM
    • Replies: 12
    • Views: 3,019
    10-26-2010, 03:14 PM Go to last post
  60. Correlation of the product of 2 multivariate normal variables...

    hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

    Started by spunky‎, 07-25-2011 11:16 PM
    • Replies: 12
    • Views: 5,966
    07-28-2011, 01:33 AM Go to last post

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