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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: 30,326
    09-30-2005, 09:44 AM Go to last post
  1. What is meant by mod

    X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here?

    Started by sajee3a‎, 09-18-2010 02:05 AM
    • Replies: 2
    • Views: 4,399
    09-21-2010, 02:27 AM Go to last post
  2. Profit and Probability

    Given a game with a probability of 1/x and a payout of y:1 where y=x/2 and a number of players n, where n>x and n%x=0. Build a distribution of...

    Started by calleo‎, 08-24-2010 06:30 AM
    • Replies: 3
    • Views: 4,397
    08-25-2010, 10:22 AM Go to last post
  3. can you get probability simply from a percentage?

    I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

    Started by Joia‎, 02-14-2009 05:35 PM
    • Replies: 5
    • Views: 4,396
    02-14-2009, 10:50 PM Go to last post
  4. Stats Homework

    I am getting ready for my test in a couple of hours actually, but I have a practice test I am attempting now. Their are 2 problems I can't seem to...

    Started by Lysolchip‎, 03-21-2006 05:59 PM
    • Replies: 1
    • Views: 4,393
    03-21-2006, 09:01 PM Go to last post
  5. PDF problem

    Suppose X has uniform distribution on (-1, 1). Find the PDF of Y = X^2. OK, without putting all the details... I got for F(y)...P(-square root...

    Started by StatStudent3‎, 10-31-2010 02:29 PM
    • Replies: 1
    • Views: 4,391
    10-31-2010, 03:42 PM Go to last post
  6. sealed bid problem

    Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

    Started by trbbls‎, 02-26-2008 03:15 PM
    • Replies: 1
    • Views: 4,388
    02-26-2008, 05:27 PM Go to last post
  7. How to determine data has Poisson Distribution

    Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

    Started by Mandeep‎, 05-08-2009 10:52 PM
    • Replies: 0
    • Views: 4,388
    05-08-2009, 10:52 PM Go to last post
  8. Odds question

    A newspaper article preceeding the 1994 World Cup semifinal match between Italy and Bulgaria stated that "Itality is favored 10-11 to beat Bulgaria,...

    Started by jamesmartinn‎, 02-12-2010 01:05 AM
    • Replies: 2
    • Views: 4,386
    02-12-2010, 06:05 PM Go to last post
  9. 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
  10. Multiple poisson versus one poisson for different arrival types

    I am trying to model guest arrivals at a restaurant with exponentially distributed times between arrivals. Arrivals can consist of different party...

    Started by patl‎, 01-05-2007 01:20 PM
    • Replies: 1
    • Views: 4,381
    01-12-2007, 06:47 PM Go to last post
  11. need help with set-up

    Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

    Started by megs915‎, 11-20-2005 01:44 PM
    • Replies: 1
    • Views: 4,375
    11-20-2005, 06:31 PM Go to last post
  12. 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: 4,375
    01-09-2006, 09:59 AM Go to last post
  13. Exponentially Distributed Random Variable

    Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

    Started by Bloodshot‎, 07-19-2007 05:41 PM
    • Replies: 1
    • Views: 4,372
    07-20-2007, 07:11 AM Go to last post
  14. Can you check my answers please?

    Hi, Can you please check my answers? Thanks 1) In examining borrower characteristics versus loan delinquency, a bank has collected the following...

    Started by SadieKhan‎, 01-09-2011 06:27 AM
    • Replies: 0
    • Views: 4,372
    01-09-2011, 06:27 AM Go to last post
  15. Help needed

    Hi, not sure how to resolve the following: An airplane as a capacity of 23 passengers. The airline knowning that 10% of passengers who have...

    Started by qbjc4300‎, 10-11-2005 05:50 AM
    • Replies: 2
    • Views: 4,371
    10-11-2005, 12:20 PM Go to last post
  16. Geometric Distribution question

    probability of raining each day = p = 0.01 q = 0.99 What is the expected number of days until we see a rainy day? I think the answer is ...

    Started by shrek‎, 07-17-2008 02:23 PM
    • Replies: 3
    • Views: 4,371
    08-17-2012, 05:31 AM Go to last post
  17. Joint Probability question

    Hi, I am stuck on this question. I can do part (a) (I think!) by just multiplying the two pdfs to give: f(x,y)= 8xy if 0<y<x<1 or 0 otherwise....

    Started by neild‎, 08-10-2010 09:08 AM
    • Replies: 3
    • Views: 4,367
    08-11-2010, 09:34 AM Go to last post
  18. two way tables

    Maybe there is no way to do this on this format. However, I am a bit stuck on a question about showing proportions on a two way table....probably...

    Started by greenatstats‎, 11-04-2005 01:11 AM
    • Replies: 7
    • Views: 4,366
    11-06-2005, 04:51 PM Go to last post
  19. Random Variables and CDF

    The problem: A transmission channel is noisy and a binary bit (assume it is a 0 or a 1) has probability of .11 of being incorrectly transmitted. ...

    Started by swuster‎, 02-24-2010 12:49 AM
    • Replies: 4
    • Views: 4,364
    02-24-2010, 11:16 AM Go to last post
  20. Estimating proportion

    A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six into a package. Twenty packages are inserted in a box...

    Started by bbrown79‎, 12-02-2009 09:43 PM
    • Replies: 0
    • Views: 4,361
    12-02-2009, 09:43 PM Go to last post
  21. Calculating Probability of Cyber Attack Data

    Folks, need some help, maybe this question is incomplete and needs more data but let me know if thats the case as well: I have a tool that...

    Started by jhingi‎, 02-17-2012 08:42 PM
    • Replies: 0
    • Views: 4,360
    02-17-2012, 08:42 PM Go to last post
  22. Two discrete random variables

    Can anyone tell how to find the variance in this problem? The random variables X and Y are normally and independently distributed with means...

    Started by Stitch‎, 03-24-2008 10:46 PM
    • Replies: 10
    • Views: 4,356
    04-09-2008, 08:23 AM Go to last post
  23. mixing distributions

    Hi there, Suppose I have the following situation (specifically I simulate the following situation): X follows Exponential(lam1) with...

    Started by leo nidas‎, 01-18-2009 06:03 PM
    • Replies: 7
    • Views: 4,351
    01-19-2009, 05:39 AM Go to last post
  24. Normal approximation to the Binomial probability

    Having a hard time figuring this out... can someone help me? Suppose that there is a 1 in 10000 (0.0001) chance that a randomly chosen star is...

    Started by mr_milano‎, 10-22-2009 12:14 AM
    • Replies: 1
    • Views: 4,350
    10-23-2009, 01:26 PM Go to last post
  25. Unhappy Urgent help needed :(

    Hey guys, its my first time in this forum and I am quite desperate. This task is totally confusing me: It is believed that as many as 25% of...

    Started by wannabe‎, 02-28-2010 03:49 PM
    • Replies: 1
    • Views: 4,350
    02-28-2010, 06:12 PM Go to last post
  26. PDF/CDF of population proportion when sampling without replacement?

    Hi Apologies if this is mathematically trivial, but I'm trying to find the probability density function and cumulative distribution function of...

    Started by simshef‎, 06-10-2009 08:20 AM
    • Replies: 2
    • Views: 4,348
    06-10-2009, 11:21 AM Go to last post
  27. expected value, uniform distribution

    Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

    Started by anavia‎, 07-11-2010 05:55 AM
    • Replies: 1
    • Views: 4,348
    07-11-2010, 11:27 AM Go to last post
  28. Basketball probability

    a basketball player has a 40% chance of making a 3 point shot. if the player tries n=12 three pintshots, what is the probability that he makes...

    Started by yoleven‎, 02-05-2011 12:16 AM
    • Replies: 1
    • Views: 4,344
    02-05-2011, 01:59 AM Go to last post
  29. Question Fitting joint distribution to empirical data

    I have a dataset of two correlated poisson variables X1 ~ Poisson(my1) X2 ~ Poisson(my2) Pr(X1,X2)<>Pr(X1)*Pr(X2) I would like to specify...

    Started by betso‎, 10-08-2008 10:02 AM
    • Replies: 0
    • Views: 4,342
    10-08-2008, 10:02 AM Go to last post
  30. Probability Density function table

    given the pdf table for function pxy(x,y) for 2 discrete random variables X and Y which take values 0,1. What do E and Cov(X,Y) equal and what is the...

    Started by marley.grace‎, 08-24-2011 07:17 AM
    • Replies: 4
    • Views: 4,338
    08-24-2011, 09:45 AM Go to last post
  31. Show that X+Y has a finite second moment

    Prove that if X and Y have finite second moments, then X+Y has a finite second moment. Attempt: (X+Y)^2 ≤ X^2 + Y^2 + 2|XY| => E ≤ E(X^2) +...

    Started by kingwinner‎, 07-14-2009 11:23 PM
    • Replies: 3
    • Views: 4,335
    07-15-2009, 09:00 AM Go to last post
  32. help!!!

    An investor holds two stocks, each of which can rise (R), remain unchanged (U), or decline (D) on any particular day. Assume that for the first...

    Started by duykhanh992‎, 01-28-2013 01:35 AM
    • Replies: 3
    • Views: 4,333
    01-29-2013, 05:58 AM Go to last post
  33. Question In a certain town....

    40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

    Started by mayday‎, 03-19-2006 10:21 PM
    • Replies: 0
    • Views: 4,332
    03-19-2006, 10:21 PM Go to last post
  34. Exam Review Question: Poisson Probability

    I have gone over my exam review and I understand most of the questions on the review, but here is a question I am not sure how to solve. I know the...

    Started by iLLogic‎, 07-23-2006 06:56 PM
    • Replies: 0
    • Views: 4,331
    07-23-2006, 06:56 PM Go to last post
  35. Expected value

    I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

    Started by brainfried78‎, 01-25-2017 12:10 AM
    • Replies: 4
    • Views: 4,331
    01-25-2017, 09:31 PM Go to last post
  36. Probability of faulty part

    Hi, The question that i am currently working on is; A company uses three machines (A,B and C) to produce electronic components. Machine A...

    Started by gisler‎, 02-24-2009 06:23 AM
    • Replies: 6
    • Views: 4,327
    03-02-2009, 09:41 AM Go to last post
  37. Exponential Family

    Hi! I'm trying to demonstrate that the following distribution is a member of the exponential family. Theta * x^(Theta-1) * exp (-x^Theta) ...

    Started by jamesmartinn‎, 11-03-2011 05:55 PM
    • Replies: 4
    • Views: 4,325
    11-04-2011, 08:29 AM Go to last post
  38. Good Probability Theory Text Book

    Hello, I am wondering if someone, preferably a graduate student, instructor, or professor, could recommend a good textbook about probability. ...

    Started by divinityofnumber‎, 05-17-2010 12:24 PM
    • Replies: 3
    • Views: 4,324
    05-17-2010, 06:43 PM Go to last post
  39. Distribution of xy/z

    Hi can someone please help me find the distribution for xy/z where x,y,z are uniform from 0 to 1 and independent. Having trouble with my set up...

    Started by nubyra‎, 01-02-2012 02:16 PM
    • Replies: 4
    • Views: 4,321
    01-03-2012, 03:42 AM Go to last post
  40. product of sequences converging in probability

    Hi, I'm stuck on the following problem: Show that if X_n -> X in probability and Y_n -> Y in probability then (X_n)(Y_n) -> XY in probability. ...

    Started by mnt‎, 03-21-2010 09:53 PM
    • Replies: 1
    • Views: 4,314
    03-22-2010, 10:40 AM Go to last post
  41. Angry help with beta distribution

    for this question How do i show that X1~Beta(a1,a2+a3) whats a hint to show this?

    Started by omega‎, 11-01-2010 09:20 PM
    • Replies: 5
    • Views: 4,313
    11-02-2010, 06:35 PM Go to last post
  42. Expected value of X

    R.V. X, given E(x+4)=10 and E=116, determine: Var(X+4); E(X)=mu Var(X)=sigma^2

    Started by landofsong‎, 11-20-2006 09:08 PM
    • Replies: 2
    • Views: 4,310
    11-22-2006, 05:58 AM Go to last post
  43. sampling normal distributions

    Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

    Started by toronto416‎, 06-19-2008 11:34 AM
    • Replies: 5
    • Views: 4,308
    06-20-2008, 12:25 PM Go to last post
  44. Need Help With Joint Density Problem Please!

    I got the problem

    Started by Porter1‎, 11-25-2009 09:15 PM
    • Replies: 5
    • Views: 4,305
    11-26-2009, 10:35 AM Go to last post
  45. Exclamation Almost sure convergence

    Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

    Started by Amelia‎, 11-22-2009 10:31 AM
    • Replies: 1
    • Views: 4,302
    11-22-2009, 11:05 AM Go to last post
  46. Average probability and empirical probability

    This is probably very simple. The problem I have relates to a far more complex calculation, but if I can understand the maths it will be easy enough...

    Started by rancid98‎, 09-19-2006 08:27 PM
    • Replies: 2
    • Views: 4,299
    09-24-2006, 09:08 PM Go to last post
  47. Ratio of uniforms is Cauchy

    Hi all! I have U is uniform(0,1) and V is uniform(-1,1) such that U^2 + V^2 <= 1. Furthermore, let X=V/U. Show that X is Cauchy. I tried to...

    Started by JennySton‎, 02-16-2010 07:40 PM
    • Replies: 4
    • Views: 4,297
    02-17-2010, 02:21 PM Go to last post
  48. Another difficult Gaussian integral

    Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

    Started by sven svenson‎, 02-04-2011 04:12 PM
    • Replies: 3
    • Views: 4,296
    04-07-2011, 11:28 AM Go to last post
  49. Hypergeometric distribution sample size

    Dear all, I have come across a couple of formulae to calculate the sample size (n) needed to detect a given level of prevalence of a condition in...

    Started by kika18‎, 12-03-2008 06:50 AM
    • Replies: 0
    • Views: 4,294
    12-03-2008, 06:50 AM Go to last post
  50. Probability Question

    You randomly pick 10 marbles from a large bag containing 1/6 red marbles. a. What are the chances that you pick exactly 4 red marbles? b. If 10...

    Started by stats_junkie‎, 10-14-2010 11:28 AM
    • Replies: 9
    • Views: 4,293
    10-14-2010, 03:10 PM Go to last post
  51. Arranging letters

    What is the probability that an arrangement of a, b, c, e, f, g begins and ends with a vowel.

    Started by iwonde‎, 10-08-2008 01:42 AM
    • Replies: 1
    • Views: 4,291
    10-08-2008, 02:13 AM Go to last post
  52. help finding the poisson probabilities in this problem

    ive got a word problem a need verification and help with the last part with, here it is: the number of flaws on a magnetic VHS tape produced at a...

    Started by subopolois‎, 02-04-2009 11:12 PM
    • Replies: 3
    • Views: 4,291
    02-06-2009, 07:00 PM Go to last post
  53. sum of normal distribution help

    X~N(3,5) Y~N(-7,2) What is the distribution of Z=4X-Y/3 ? is it just =- Y/3 + 4X =- Y~N(-7/3,2/3) + X~N(-7/3 + 3,2/3 + 5) = X~N(-7/3 + 3,2/3...

    Started by omega‎, 11-21-2010 12:35 PM
    • Replies: 2
    • Views: 4,290
    11-21-2010, 02:01 PM Go to last post
  54. Sigma Algebra Proof

    Hello, I am having trouble with the following probability question, and I would be grateful for some assistance with it. (I have attached it to the...

    Started by AdvoTDV‎, 09-02-2010 08:49 AM
    • Replies: 2
    • Views: 4,288
    09-02-2010, 01:48 PM Go to last post
  55. Probability Noob

    Hey guys, Im a noob im taking Prob & Stats for Eng. Im only familiar with probability of getting a 4 by rolling a die. Anyway I just wanted to run...

    Started by bigbob‎, 09-21-2013 09:51 PM
    • Replies: 0
    • Views: 4,288
    09-21-2013, 09:51 PM Go to last post
  56. almost sure convergence

    Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

    Started by chchamp‎, 01-12-2012 01:38 PM
    • Replies: 5
    • Views: 4,285
    01-13-2012, 04:20 AM Go to last post
  57. is causal & invertible Gaussian ARMA(p,q) process strictly stationary?

    I have the definition of strict stationary, and causal/invertible ARMA(p,q) process. However, I'm having trouble connecting the dots. We know that...

    Started by hanelliot‎, 08-12-2010 03:57 PM
    • Replies: 0
    • Views: 4,284
    08-12-2010, 03:57 PM Go to last post
  58. [SOLVED] New to Probability

    Hello! I am taking my first stats course in University, and I am normally pretty good with number (finished with A+s in linear algebra, and...

    Started by HHPS‎, 02-01-2012 09:58 PM
    • Replies: 5
    • Views: 4,280
    02-01-2012, 11:17 PM Go to last post
  59. Video Game Probability Stats

    First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

    Started by Bugg5287‎, 06-01-2008 01:55 AM
    • Replies: 0
    • Views: 4,279
    06-01-2008, 01:55 AM Go to last post
  60. exponential distribution: funtional system

    Problem: The system is functional if all 3 of its components are in working condition. If lifetime of each components is distributed...

    Started by jwxie518‎, 07-06-2011 08:07 PM
    • Replies: 4
    • Views: 4,278
    07-09-2011, 12:08 PM Go to last post

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