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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: 30,322
    09-30-2005, 09:44 AM Go to last post
  1. Sum of Poisson Distribution

    Hi everyone. Let X and Y be independent, with X~Poi(lambda) and Y~Poi(mu). Put Z = X + Y as their sum. Find the distribution X | Z = z.

    Started by woody198403‎, 08-18-2009 07:07 AM
    • Replies: 8
    • Views: 19,429
    02-13-2012, 07:50 PM Go to last post
  2. help with 2 r.v. normal distribution problem

    Hi all, so my question has to do with 2 r.v. and normal distribution. X: mean = 5000, standard deviation = 100 Y: mean = 5200, standard...

    Started by pww‎, 03-08-2010 04:15 PM
    • Replies: 8
    • Views: 5,571
    04-06-2010, 08:54 PM Go to last post
  3. Figure out if there is any statistical significance

    Hi - I have some data on the internal temperature of cooked meat. The meat patty is a failure if the temperature obtained is below a certain...

    Started by mulamootil‎, 05-19-2010 07:13 PM
    • Replies: 8
    • Views: 11,649
    06-10-2010, 01:27 PM Go to last post
  4. Simple probablility question

    A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

    Started by c2q‎, 06-08-2010 12:51 AM
    • Replies: 8
    • Views: 8,064
    06-08-2010, 05:53 PM Go to last post
  5. Writing a book - need help!

    I am writing a book on double deck pinochle and need to get accurate percentages. I am hoping this forum is willing and able to help me! If I am in...

    Started by rakbeater‎, 08-01-2010 08:31 PM
    • Replies: 8
    • Views: 3,984
    08-05-2010, 12:21 AM Go to last post
  6. Hypergeometric distribution problem

    A purchaser receives small lots (N = 25) of a high precision device. She wishes to reject the lot 95% of the time if it contains as many as seven...

    Started by pearl‎, 09-13-2010 09:46 AM
    • Replies: 8
    • Views: 6,709
    09-13-2010, 02:49 PM Go to last post
  7. unfair coin problem

    im stuck with a part of a problem which is : An unfair coin (p{h}=p=0.6) is tossed n=20 times. FIND the probability that the number of heads k is...

    Started by sajee3a‎, 09-13-2010 03:41 PM
    • Replies: 8
    • Views: 6,642
    09-14-2010, 01:46 AM Go to last post
  8. random variables

    compute xbar=integral xf(x)dx for the continous distribution: exponential:f(x)=u(x)lambda e^-lambdax. compute x^2bar

    Started by sajee3a‎, 09-15-2010 11:12 PM
    • Replies: 8
    • Views: 3,792
    09-18-2010, 02:38 AM Go to last post
  9. Question Probability Distribution

    The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

    Started by SadieKhan‎, 09-21-2010 02:28 PM
    • Replies: 8
    • Views: 4,085
    09-22-2010, 01:01 PM Go to last post
  10. System of 5 independent components

    I have done problems similar to this one with 4 components but im getting stumped with this one. The probability of FAILURE for each components is...

    Started by gator78‎, 10-11-2010 05:42 PM
    • Replies: 8
    • Views: 4,437
    10-12-2010, 09:25 AM Go to last post
  11. A little help with distributions

    I have been assigned a project that involves statistics and i have no idea about it. I was suppose to capture online game traffi and then using the...

    Started by saeen‎, 10-13-2010 12:39 AM
    • Replies: 8
    • Views: 3,435
    10-18-2010, 01:07 PM Go to last post
  12. Question Cumulative Distribution Function

    Please help me, I have 2 cases: 1. n is positive constant and defined by function f(x)=1/2.n.e^(-n.x) if x>=0 and f(x)=1/2.n.e^(-n.x) if x<0....

    Started by statjunior‎, 10-19-2010 10:59 PM
    • Replies: 8
    • Views: 10,207
    10-26-2010, 01:37 AM Go to last post
  13. CDF problem

    Problem - Let X be a random variable with c.d.f. F(x). Find the c.d.f. of aX + b first for a > 0, then for a < 0. (for a > 0) F(x) = P(X <= x) ...

    Started by StatStudent3‎, 10-30-2010 04:59 PM
    • Replies: 8
    • Views: 8,094
    11-02-2010, 04:24 PM Go to last post
  14. question about independent variables

    Hi, all – So, my daughter just came to me with a homework problem. She already has the answer from the back of the book, but doesn't understand...

    Started by mzimmers‎, 12-06-2010 10:11 PM
    • Replies: 8
    • Views: 2,930
    12-06-2010, 11:14 PM Go to last post
  15. Question question about a normal distribution probability homework

    hello everyone ; glad to be here with you :D i hope you'll help me to resolve this problem exercise : we inform you that's 84,13% of the...

    Started by Moorish‎, 12-11-2010 08:49 AM
    • Replies: 8
    • Views: 4,498
    12-12-2010, 06:14 PM Go to last post
  16. Difference of two Gaussian RV's

    Haven't done stats in awhile and now im stuck in a class and im the only undergrad. :confused: If I could get some guidance I could probrabaly...

    Started by HHB‎, 01-11-2011 06:18 PM
    • Replies: 8
    • Views: 10,445
    01-11-2011, 09:28 PM Go to last post
  17. Unhappy Independence of Bivariate Continuos RV's.

    By the two definitions of independence for bivariate continuous RVs: (1) F(x,y)=F_X(x)F_Y(y) and (2) f(x,y)=f_X(x)f_Y(y). Prove that these two are...

    Started by Actuarial_Deepika‎, 01-30-2011 03:01 AM
    bivariate random variable, continuous, independent
    • Replies: 8
    • Views: 3,568
    01-30-2011, 11:44 PM Go to last post
  18. Lottery probability. What if a friend wins?

    As a programmer I've worked a little bit with statistics, but not much with probability. An interesting question has come to mind this week, and it...

    Started by donkeyhotay‎, 03-01-2011 09:35 AM
    • Replies: 8
    • Views: 5,701
    03-03-2011, 04:53 PM Go to last post
  19. Lightbulb What is the chance to have a mutual friend with a random person ?

    We have a social network say facebook. We know that it is composed by 500 milion of users. We know that each user have an average of 135 friend. ...

    Started by giudf‎, 03-14-2011 04:11 AM
    mutual friend, six degree, social network
    • Replies: 8
    • Views: 9,979
    09-02-2011, 06:35 PM Go to last post
  20. what test shoud I use?

    hi! I have a problem, I don't know which test should I use... So here it goes: Let's assume we are observing a population of students on a...

    Started by little_stats‎, 03-19-2011 06:34 AM
    • Replies: 8
    • Views: 3,062
    03-20-2011, 09:10 AM Go to last post
  21. Probability of a player winning a best-of-n contest with a given current scoreline...

    Many sports are played over a best-of-n format, where the first player to reach a specified number games won wins the overall contest. An example...

    Started by marcolan‎, 05-02-2011 10:29 AM
    • Replies: 8
    • Views: 4,791
    01-16-2012, 10:24 AM Go to last post
  22. Question finding MLE

    f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

    Started by Sambit‎, 05-11-2011 12:15 PM
    • Replies: 8
    • Views: 4,384
    05-13-2011, 08:05 AM Go to last post
  23. Probability Question

    This is not for homework or class. Only research can make me post such a specific question. I've tried different things, and searched a lot online,...

    Started by monkeyD‎, 06-17-2011 10:41 AM
    • Replies: 8
    • Views: 3,588
    06-18-2011, 06:15 PM Go to last post
  24. probability question

    a council of a town consist of 5 members: Member Gender 1 M 2 M 3 F 4 F 5 ...

    Started by Yankel‎, 06-23-2011 09:48 AM
    • Replies: 8
    • Views: 2,078
    06-24-2011, 07:56 AM Go to last post
  25. six digit no.

    a no. of six digit is written down at random. the probability that the sum of the digit of the no. is even is

    Started by juantheron‎, 07-26-2011 11:09 PM
    • Replies: 8
    • Views: 3,222
    07-30-2011, 03:15 AM Go to last post
  26. Need a Probability Answer

    hello , i read a bit from the forum and i saw that i still do not have a answer to my propability question. The situation is like this How to...

    Started by k_rukov‎, 07-28-2011 07:11 PM
    • Replies: 8
    • Views: 4,944
    08-21-2011, 03:57 PM Go to last post
  27. 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: 10,559
    06-15-2012, 06:22 PM Go to last post
  28. Conditional Probability

    In order to be qualified for a job, a candidate need to pass 3 exams. If a candidate fail an exam, he can't take the next one. A random candidate...

    Started by Yankel‎, 11-26-2011 04:06 PM
    • Replies: 8
    • Views: 3,087
    12-06-2011, 08:13 PM Go to last post
  29. Question Conditional Mean & Variance

    I always get into trouble when dealing problems of conditional distribution:( please help :wave: Let Y be the number of heads obtained by tossing...

    Started by TYW‎, 12-05-2011 07:00 AM
    • Replies: 8
    • Views: 3,426
    12-06-2011, 11:15 AM Go to last post
  30. What distribution is this?

    Hi, Looks like a nice forum here, hope you guys help me with this question, this is not a homework one since I am a coder, need to verify it for my...

    Started by tommyle‎, 01-12-2012 06:32 AM
    • Replies: 8
    • Views: 3,036
    01-13-2012, 05:54 AM Go to last post
  31. please help me with this question?

    the time it takes for me to reach the university from my home has a normal distribution with mean 45 minutes and standard deviation 15 minutes. I...

    Started by navaniDW‎, 01-18-2012 12:33 AM
    • Replies: 8
    • Views: 2,573
    01-18-2012, 01:30 AM Go to last post
  32. coin toss

    I have a coin that lands heads with probability p1; you have a coin that lands heads with probability p2. I toss my coin until I get a head. Each...

    Started by meena‎, 02-23-2012 06:39 AM
    coin toss probability
    • Replies: 8
    • Views: 3,450
    02-26-2012, 05:35 AM Go to last post
  33. Probability question:??

    If I have 2 coins the first coin is a fair coin and sec one is two head. I randomly pick one and toss it twice, the result are both head for two...

    Started by Adam.‎, 02-29-2012 01:16 PM
    • Replies: 8
    • Views: 2,375
    02-29-2012, 06:09 PM Go to last post
  34. Bayesian vs. Frequentist

    Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

    Started by whomp‎, 05-06-2012 04:01 PM
    • Replies: 8
    • Views: 4,485
    07-03-2012, 03:43 PM Go to last post
  35. Question Please Help :(

    I been trying to figure this out for so long, i just dont get it. if anyone can explain the answer it'd be very much appreciated. A box of 100...

    Started by statshead‎, 05-11-2012 08:26 AM
    • Replies: 8
    • Views: 2,209
    05-12-2012, 01:37 AM Go to last post
  36. Die probabilistic

    i am reading Mostellers book on 50 difficult probability questions. the question I am struggling with is on the average, how many times must a die be...

    Started by gibbspr@yahoo.co.uk‎, 08-02-2012 07:28 AM
    • Replies: 8
    • Views: 1,951
    08-02-2012, 04:57 PM Go to last post
  37. How many different combinations can a user make?

    I would like to figure how many different ways a report can be filtered. The report shows how many different units were sold. Filter 1: Allows...

    Started by Marshall‎, 08-18-2012 01:16 PM
    permutation combination
    • Replies: 8
    • Views: 4,045
    08-20-2012, 08:55 PM Go to last post
  38. Sampling Probability Question

    Hi Folks. i have a probability question. Actually, it's more of a sampling question. I have a population that contains 6 different conditions. ...

    Started by John Sigma‎, 09-03-2012 09:21 AM
    • Replies: 8
    • Views: 1,713
    09-05-2012, 06:05 AM Go to last post
  39. Trouble understanding a specific Uniform transformation

    This is homework.... Q: The RV X has U~(0,1). Find the CDF of Y=max(X,1/2). I am struggling to set this up. I understand (I think) that...

    Started by hedgie‎, 09-23-2012 10:34 PM
    • Replies: 8
    • Views: 2,588
    09-25-2012, 09:16 AM Go to last post
  40. Conditional Probability using Bayes' Theorem

    Hello, I am trying to solve this conditional probability question: A certain college has observed that 20% of its freshmen are unqualified and drop...

    Started by S-C-3-1-3‎, 09-23-2012 10:36 PM
    • Replies: 8
    • Views: 5,771
    09-24-2012, 02:33 PM Go to last post
  41. Probability help solving problem

    A hopeful TV Talent Show contestant claims to be able to predict the result of tossing a coin. To check this out, a fair coin is flipped 24 times,...

    Started by Nellen2222‎, 09-27-2012 11:44 PM
    • Replies: 8
    • Views: 2,151
    09-29-2012, 02:24 PM Go to last post
  42. Probability Question

    Hi I have tried tooth and nail to try and get this question done but cant seem to solve it. I have just started university and am coming to terms...

    Started by masamoah23‎, 10-17-2012 01:47 PM
    • Replies: 8
    • Views: 2,016
    10-20-2012, 05:23 AM Go to last post
  43. 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: 1,881
    10-16-2012, 02:32 AM Go to last post
  44. R^2=0

    How can I show that R^2 can be equal to or less than zero? I can't find an example.

    Started by alias‎, 11-01-2012 10:17 PM
    • Replies: 8
    • Views: 2,182
    11-02-2012, 12:48 AM Go to last post
  45. Duplicate sample probability

    I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

    Started by emmental‎, 11-26-2012 06:46 PM
    duplication, sample
    • Replies: 8
    • Views: 4,481
    11-28-2012, 07:37 AM Go to last post
  46. moment generating functions

    Stuck on homework question: I need to show the m.g.f. of an exponential distribution is: M_x(t)=\frac{\beta}{\beta-t} for t<\beta First i...

    Started by Prometheus‎, 01-12-2013 10:16 AM
    • Replies: 8
    • Views: 2,004
    01-19-2013, 07:39 AM Go to last post
  47. Probability Question from Boss

    We received this question from our boss, he said there would be a prize to the first person to answer it. I submitted my response and he said I was...

    Started by senorpi‎, 02-14-2013 11:04 AM
    • Replies: 8
    • Views: 1,294
    03-14-2013, 09:59 AM Go to last post
  48. Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms.

    Wigan V City Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms. Please advise how to proceed with this question...

    Started by Poisson1‎, 01-10-2013 10:54 AM
    • Replies: 8
    • Views: 1,929
    01-14-2013, 06:46 PM Go to last post
  49. The sample covariance matrix is ALWAYS nonsingular... Right?

    Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

    Started by will22‎, 04-30-2013 11:04 PM
    • Replies: 8
    • Views: 9,249
    05-03-2013, 01:27 PM Go to last post
  50. Probability help

    Hello! I am a complete novice with all things related to statistics and/or probabilities (as my name suggests). I need to answer this question for a...

    Started by StatNoob101‎, 02-24-2013 09:54 PM
    • Replies: 8
    • Views: 2,253
    02-24-2013, 11:16 PM Go to last post
  51. Finding UNcondintional Mean and Variance of U

    Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

    Started by S-C-3-1-3‎, 02-01-2013 02:57 AM
    • Replies: 8
    • Views: 5,954
    02-03-2013, 09:43 AM Go to last post
  52. Use Normal Distribution and Chi-square distribution

    My question is as follows: If X and Y are independent random variables, X has a normal distribution with mean 2 and variance 4, and Y has a...

    Started by siope1kd‎, 03-07-2013 11:55 PM
    chi-square, normal distribution, probability
    • Replies: 8
    • Views: 1,963
    03-08-2013, 01:41 AM Go to last post
  53. Need help figuring this out...

    Three gentlemen, Prof. Plum, Mr. Green, and Col. Mustard, have offended each others' honor. They will settle their dispute with a duel truel with...

    Started by nipatel‎, 05-07-2013 08:28 PM
    • Replies: 8
    • Views: 2,465
    05-24-2013, 10:26 PM Go to last post
  54. Binomial probability

    A number of trials were run with a high success rate, n = 1700 & 99.9% success How can I calculate (with 95% confidence) the lowest probability of...

    Started by George Bea‎, 05-07-2013 04:11 AM
    • Replies: 8
    • Views: 1,881
    05-15-2013, 06:24 AM Go to last post
  55. Show that a stochastic variable is allmost this expression.

    Hi We have a binomial situation where the p value is: p=\frac{2}{a}, our end goal is to find an estimator for a, and an estimate for this...

    Started by Samwell‎, 06-08-2013 10:45 AM
    • Replies: 8
    • Views: 1,670
    06-09-2013, 11:05 AM Go to last post
  56. Outcomes of coin toss with restrictions?

    Hey guys, Apologies if this is in the wrong area. I'm busy with a non academic project at the moment, and I need to determine the number of...

    Started by GTG‎, 08-08-2013 06:37 AM
    • Replies: 8
    • Views: 2,191
    08-10-2013, 10:49 AM Go to last post
  57. Chance of an Occurance

    ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

    Started by cdurta‎, 07-28-2013 06:46 PM
    • Replies: 8
    • Views: 2,980
    07-30-2013, 11:49 PM Go to last post
  58. Bayesian prediction interval

    Started by TrueTears‎, 08-14-2013 06:57 AM
    • Replies: 8
    • Views: 2,767
    08-14-2013, 09:37 AM Go to last post
  59. Proving the equality of two expressions

    Started by TrueTears‎, 08-27-2013 07:48 AM
    • Replies: 8
    • Views: 2,009
    08-27-2013, 11:06 AM Go to last post
  60. Prob distribution

    The roulette wheel has 38 “pockets”. The “pockets” are numbered 1, 2, …, 36; 0 and 00. Half of the “pockets” 1, 2, …, 36 are coloured red, the...

    Started by lemon_kaka‎, 09-20-2013 10:38 PM
    • Replies: 8
    • Views: 1,794
    09-22-2013, 07:02 AM Go to last post

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