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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: 30,406
    09-30-2005, 09:44 AM Go to last post
  1. Arrow Basic Probability

    6 Boys and 6 Girls sit in a row at random. Find the probability that the boys and girls sit alternately. Please help me with steps to calculate in...

    Started by sukumartenth‎, 10-29-2010 03:28 AM
    • Replies: 9
    • Views: 4,079
    10-29-2010, 03:58 PM Go to last post
  2. Question cdf and pdf

    consider the following cumulative distribution function F(x) = 0, x<0 =\frac{x+k}{5}, k\leq x<k+1, k=0,1,2 =1, x\geq3 find P(X=j) for all...

    Started by Sambit‎, 11-01-2010 09:53 AM
    • Replies: 9
    • Views: 3,367
    11-01-2010, 12:03 PM Go to last post
  3. Point (X,Y) is picked inside square

    I saw this problem and we have gone over joint probability but I searched all over my textbook and could not find a problem similar. A point (X,Y)...

    Started by gator78‎, 11-03-2010 11:37 AM
    • Replies: 9
    • Views: 6,566
    11-09-2010, 12:26 PM Go to last post
  4. Probability Homework(2)

    The deeper i go into the probability chapter, the more confused i get :(, here are sum questions. they might be really easy but i'm not getting them....

    Started by aisha00‎, 12-09-2010 12:14 PM
    • Replies: 9
    • Views: 16,974
    02-24-2012, 11:19 PM Go to last post
  5. A question on probability

    Let X_1, X_2, \ldots, X_{10} be a random sample from N(80, 3^2) distribution. Define S = \sum_{i=1}^{10} U_i T = \sum_{i=1}^{10}\left(...

    Started by kamekaze‎, 01-29-2011 10:25 AM
    • Replies: 9
    • Views: 2,911
    01-30-2011, 11:56 PM Go to last post
  6. cumulative distribution function for error

    Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

    Started by hammid1981‎, 03-03-2011 10:15 AM
    • Replies: 9
    • Views: 6,299
    03-04-2011, 12:06 AM Go to last post
  7. Maximum likelihood estimator question with discrete uniform distribution

    Q. A bag contains sequentially numbered lots (1,2...N). Lots are drawn at random (each lot has the same probability of being drawn). Two lots are...

    Started by languagelearner23‎, 03-06-2011 07:40 AM
    • Replies: 9
    • Views: 12,801
    03-06-2011, 01:15 PM Go to last post
  8. Question MLE of range of Uniform(a,b)

    So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

    Started by conundrum‎, 03-16-2011 06:47 PM
    mle, mvue, uniform
    • Replies: 9
    • Views: 10,971
    03-17-2011, 12:13 PM Go to last post
  9. probability problem

    Hi, First Thanks in advance. I am current studying distance education and struggle with some probability homework Qs. So glad I found this site. ...

    Started by fool‎, 03-18-2011 01:32 AM
    • Replies: 9
    • Views: 7,158
    03-21-2011, 10:35 PM Go to last post
  10. Expected Value calculation

    I have 2 random variables U and V uniformly distributed on . Their joint cumulative distribution function F(u, v) = min (u,v) on x . Therefore I...

    Started by 1stone‎, 03-30-2011 08:48 AM
    • Replies: 9
    • Views: 4,023
    06-07-2011, 04:17 PM Go to last post
  11. Prob. Question

    Hi, I have this question. A guy has to get to office early. There is a 40% chance he will wake late and 25% chance he will be stuck in traffic....

    Started by TransMogrifier‎, 06-21-2011 05:07 AM
    • Replies: 9
    • Views: 2,841
    06-22-2011, 11:38 AM Go to last post
  12. Probability of an event after combining (Union) two sample spaces

    Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

    Started by saleem‎, 06-23-2011 09:20 PM
    probability question
    • Replies: 9
    • Views: 5,347
    09-20-2012, 01:25 AM Go to last post
  13. Small problem, calculating probability.

    Ok so this was my problem on my last exam: NOTE that i am not asking you to solve this problem for me look bellow. Oke. I know how to solve...

    Started by nered‎, 07-06-2011 02:19 PM
    • Replies: 9
    • Views: 2,420
    07-07-2011, 11:27 AM Go to last post
  14. Thumbs down Stochastic Problem, any help greatly appreciated

    Admittedly I am a bit rusty with my stochastic modelling, but here is the question I have been given. I am just looking for a bit of a guide as to...

    Started by OToole‎, 09-25-2011 01:57 PM
    • Replies: 9
    • Views: 3,434
    10-04-2011, 12:27 PM Go to last post
  15. More education = less income?

    Years ago a guy from ESA told me that at his 50 year high school reunion the only millionaire was the only guy who didn't go to college. ...

    Started by Outlier‎, 10-06-2011 09:15 AM
    • Replies: 9
    • Views: 2,560
    10-06-2011, 05:58 PM Go to last post
  16. Probability question.

    suppose i have a population n=90386 where: typeA=46362, typeB=22012, typeC=22012 if i choose 145 items from the population (without returning...

    Started by screamingforanewday‎, 10-26-2011 07:34 PM
    • Replies: 9
    • Views: 2,398
    10-26-2011, 09:58 PM Go to last post
  17. Expectation of random vectors.

    Hi there. I'm trying to prove: Cov(X,Y) = E(XY') - E(X)(E(Y))' So i know the cov of 2 random vectors is written by Cov(X,Y) = E can...

    Started by c2q‎, 11-06-2011 02:25 PM
    • Replies: 9
    • Views: 5,038
    11-06-2011, 03:27 PM Go to last post
  18. Simple probability question

    I've been writing up some basic code for my own trading to show things like, if I have a 70% chance of losing, and each time I lose 5%, I would...

    Started by qwirky64‎, 01-27-2012 02:35 PM
    • Replies: 9
    • Views: 2,410
    01-30-2012, 05:00 AM Go to last post
  19. Proving some axioms about sigma algebra.

    I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

    Started by c2q‎, 02-04-2012 01:13 PM
    • Replies: 9
    • Views: 7,664
    02-05-2012, 10:32 PM Go to last post
  20. geometric prob

    hey there, I have a question. X is geometric random variable ~G(1/2) the question: calculate E( (5/4)^x ) = ? Thanks, Jim.

    Started by eyehawk‎, 02-16-2012 12:52 PM
    • Replies: 9
    • Views: 2,612
    02-17-2012, 11:08 AM Go to last post
  21. Question decimal answer need for probability

    Happy Meal Problem: McDonalds offers a little toy with its happy meals. They have 5 different toys and each toy has the same probability of appearing...

    Started by sasori‎, 02-27-2012 10:54 PM
    • Replies: 9
    • Views: 3,261
    02-28-2012, 08:39 AM Go to last post
  22. Binomial Distribution

    I really need help with this homework. I've been on one question for over an hour. The Question is The rates of on-time flights for commercial...

    Started by PitaTheGreat‎, 03-05-2012 06:33 PM
    binomial distribution, probability
    • Replies: 9
    • Views: 12,063
    03-05-2012, 07:24 PM Go to last post
  23. 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: 2,233
    06-25-2012, 09:00 PM Go to last post
  24. convergence in probability help

    Hey guys, I'm hoping that one of you smarter than me can help me with understanding the concept of convergence in probability. I'm currently using...

    Started by Link‎, 07-05-2012 12:18 PM
    • Replies: 9
    • Views: 2,748
    07-05-2012, 04:09 PM Go to last post
  25. Probability of Independent Events

    Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

    Started by yzhao5‎, 08-02-2012 04:17 PM
    • Replies: 9
    • Views: 2,407
    08-05-2012, 12:39 PM Go to last post
  26. 50-50 or just abusing the game?

    Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

    Started by otterman‎, 09-22-2012 12:56 AM
    gambling
    • Replies: 9
    • Views: 2,234
    09-25-2012, 02:12 PM Go to last post
  27. Find Densities for Exponential Distribution

    I am given a general problem: Suppose that X1, ..., Xn is a sample from the Exponential(theta) distribution. Find the densities fx(1) and fx(n). ...

    Started by simplemts‎, 09-26-2012 01:02 PM
    • Replies: 9
    • Views: 2,223
    09-26-2012, 02:35 PM Go to last post
  28. Problem involving selecting players from a Basketball team.

    Hi, I want to solve the following problem: Suppose a team of 5 guards and 6 forwards must be selected from a roster of 10 guards and 16 forwards....

    Started by S-C-3-1-3‎, 10-18-2012 07:59 PM
    • Replies: 9
    • Views: 2,152
    10-19-2012, 02:16 PM Go to last post
  29. GLS estimation in SAS or SHAZAM Econometrics

    I've spent a long time looking for this so I thought I'd post for some help. C1i = β1+β2Q1i+β3(Q1i)^2+β4(Q1i)^3+εi, Var(εi) = σ^2*Q1i there are 28...

    Started by alias‎, 11-26-2012 01:47 PM
    • Replies: 9
    • Views: 6,760
    11-27-2012, 09:08 AM Go to last post
  30. how to compare different normal distributions: chance of winning in a popular game

    A, B, C, and D play a game, in which scores follow a normal distribution A's mean score is 34 (sd 3), B mean 33 (sd 3.5), C mean 32 (sd 4), D mean...

    Started by caralee‎, 11-20-2012 12:35 PM
    • Replies: 9
    • Views: 2,182
    11-22-2012, 05:09 PM Go to last post
  31. How to compute the joint Probability distribution of the functions of random variable

    Hi all, I have a problem about joint CDF. X and Y are independent random variables with known Probability density functions. Now there are...

    Started by camnjv‎, 04-27-2013 05:39 AM
    • Replies: 9
    • Views: 2,375
    04-27-2013, 07:06 PM Go to last post
  32. Die throwing competition, probability of winning

    Suppose a friend and I are playing a game with a fair die. We throw alternatively and whoever rolls a 6 first wins. I get to roll first. What is the...

    Started by statsprobs‎, 02-26-2013 11:21 AM
    • Replies: 9
    • Views: 2,554
    02-26-2013, 08:16 PM Go to last post
  33. Need help with basic probability scenario (not hw)

    Rephrasing the scenario into a word problem for the sake of simplicity. I hope it doesn't get convoluted, but then again explaining the actual...

    Started by rw90‎, 05-11-2013 04:29 PM
    • Replies: 9
    • Views: 1,808
    10-23-2013, 01:12 AM Go to last post
  34. what's the chance that a number n is prime IF....?

    so... a compuer science friend of mine and myself were having lunch together and discussing whether or not studying number theory can be your one-way...

    Started by spunky‎, 06-10-2013 03:47 PM
    • Replies: 9
    • Views: 1,381
    06-11-2013, 02:33 AM Go to last post
  35. bio stats probability basic problem

    : Biostatistics problem. Probability of obtaining positive test results in a diagnostic method. Hello: I have a biostatistics/probability...

    Started by parsec2011‎, 05-29-2013 06:03 AM
    diagnostic
    • Replies: 9
    • Views: 2,167
    06-23-2013, 09:31 AM Go to last post
  36. Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

    Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

    Started by guerreiro74‎, 06-18-2013 07:34 AM
    approximation, bernoulli, clt, not iid
    • Replies: 9
    • Views: 2,465
    06-19-2013, 02:47 PM Go to last post
  37. Need help for an exercise about Roulette - Variance calculation

    Hello, i'm working on a theoretical Roulette exercise. There are 37 numbers on the roulette, 18 are Red. A player is playing an amount B (his...

    Started by mascip‎, 07-06-2013 10:56 AM
    • Replies: 9
    • Views: 2,390
    07-10-2013, 03:19 AM Go to last post
  38. 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: 2,198
    12-12-2013, 10:37 AM Go to last post
  39. Relating Type I and Type II Error to C-charts

    Hello, I am trying to figure out how to relate type I and type II error calcuations to c-charts. Ive already calculated the 3 sigma control...

    Started by math&science‎, 04-20-2014 09:49 PM
    • Replies: 9
    • Views: 2,464
    04-21-2014, 03:25 PM Go to last post
  40. Please help, need to find a book

    Dear friends, I need to find the textbook where the exercises on the photo (attached) come from. It's very urgent. Please help. Thank everybody.

    Started by East31‎, 06-25-2014 10:56 PM
    • Replies: 9
    • Views: 2,458
    06-26-2014, 10:26 PM Go to last post
  41. Probability based on multiple pieces of information

    It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

    Started by bobbytables‎, 07-20-2014 10:25 PM
    • Replies: 9
    • Views: 1,842
    07-22-2014, 12:57 PM Go to last post
  42. red balls and blue balls

    Hi there everyone I'm a complete newbie to probability and currently taking a foundation degree at Uni of which statistics is one of my modules. I...

    Started by timlazisa‎, 12-10-2014 01:01 PM
    • Replies: 9
    • Views: 2,533
    12-14-2014, 07:40 AM Go to last post
  43. 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: 1,991
    07-21-2015, 09:32 AM Go to last post
  44. Bivariate transformation?

    Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

    Started by Talik‎, 01-11-2016 06:53 PM
    • Replies: 9
    • Views: 1,737
    01-11-2016, 08:37 PM Go to last post
  45. Another game designer dice question...

    Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

    Started by hazard‎, 03-08-2016 10:20 PM
    • Replies: 9
    • Views: 2,767
    04-09-2016, 09:53 AM Go to last post
  46. Chebyshev's Inequality problem

    Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

    Started by greg6363‎, 09-27-2016 12:08 AM
    • Replies: 9
    • Views: 2,577
    09-27-2016, 09:46 PM Go to last post
  47. Which probability distribution do I use for this, and how?

    Hi all, Im not a statistitian, although I have some reasonable education in mathematics. This isn't a homework question (I'm 37 lol), its just...

    Started by danlightbulb‎, 05-25-2017 04:25 PM
    • Replies: 9
    • Views: 1,196
    05-30-2017, 05:02 PM Go to last post
  48. Probabilty problem for a Stock Market System

    Hi, I have a Probabilty problem for a Stock Market System. Assume I have backtested a system over say 1,000 historical trades. It wins say 40%...

    Started by pfpurcell‎, 01-05-2006 04:29 PM
    • Replies: 8
    • Views: 4,392
    01-09-2006, 09:59 AM Go to last post
  49. Thanks to John M & more questions

    Thanks to John M for all of his help! I have several more questions that I got wrong answers on and would like to know the correct answers if anyone...

    Started by orangeb‎, 02-08-2006 07:26 AM
    • Replies: 8
    • Views: 3,262
    04-27-2006, 01:42 PM Go to last post
  50. Probability of Death?

    Each patient that receives a particular drug has a 4% chance of dying because of the medication. If 200 patients receive this drug, what is the...

    Started by nickcherryjiggz‎, 10-15-2006 04:40 PM
    • Replies: 8
    • Views: 3,866
    10-19-2006, 12:05 PM Go to last post
  51. sample space

    ok, so in this question, there are 6 people, 2 out of 6 can win the prize in the raffle. People: a,b,c,d,e,f and here is the sample space:...

    Started by salsa9417‎, 03-06-2008 02:36 AM
    • Replies: 8
    • Views: 3,364
    03-09-2008, 08:00 PM Go to last post
  52. Moment Generating Functions

    The random variable X has a uniform distribution on (0,1). Find the moment generating function of Y=-aln(X), and hence find the probability...

    Started by statsrocks‎, 04-05-2008 04:33 PM
    • Replies: 8
    • Views: 3,824
    04-06-2008, 12:26 PM Go to last post
  53. Smile PDF and E(Y)

    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 02:40 AM
    • Replies: 8
    • Views: 5,487
    05-14-2008, 07:03 AM Go to last post
  54. Card Prob.

    A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

    Started by HikariT‎, 06-01-2008 02:26 PM
    • Replies: 8
    • Views: 3,890
    06-01-2008, 05:24 PM Go to last post
  55. need help with a couple questions

    1) The US Army requires women's height to be between 58 in. and 80 in. Find the percentage of women meeting that height requirement. Women's heights...

    Started by xUnderclassHero‎, 12-16-2008 03:14 PM
    • Replies: 8
    • Views: 6,897
    12-16-2008, 05:15 PM Go to last post
  56. Exclamation Powerball Question: Play To Win

    Alright, Tonight I got into an argument with one of my friends. I bought a powerball ticket, and we were talking about whether you should play...

    Started by I Am Right‎, 01-15-2009 01:20 AM
    • Replies: 8
    • Views: 3,711
    01-21-2009, 01:31 PM Go to last post
  57. Question on standard unit problem

    Mutual Fund A has an average return of $25,000 and Mutual Fund B has an average return of $5,000. The standard deviation for Fund A is $10,000 and...

    Started by rossini‎, 09-03-2009 12:23 AM
    • Replies: 8
    • Views: 4,255
    09-03-2009, 11:56 AM Go to last post
  58. probability problem

    can anyone help me with this problem? a boy finds that he can climb to a height of at least 1.85m once in five attempts, and to a height of at...

    Started by gorilla17‎, 02-03-2010 02:55 PM
    • Replies: 8
    • Views: 3,279
    02-03-2010, 09:54 PM Go to last post
  59. Statistics newb with poker questions

    Let's say I have a dozen variables for tens of thousands of players and I'm trying to figure out the formula using a symbolic regression program for...

    Started by barbiedoll‎, 02-02-2010 07:19 PM
    • Replies: 8
    • Views: 4,021
    02-03-2010, 04:59 PM Go to last post
  60. Conditional expectation question

    Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

    Started by busstud123‎, 03-01-2010 12:10 PM
    • Replies: 8
    • Views: 5,429
    03-06-2010, 02:46 AM Go to last post

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