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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: 30,374
    09-30-2005, 09:44 AM Go to last post
  1. Need some help understanding probability theory.

    Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

    Started by c2q‎, 09-19-2010 04:41 PM
    • Replies: 5
    • Views: 4,939
    09-19-2010, 10:02 PM Go to last post
  2. What is "countability" mean exactly.

    Hi, If a question said, S is uncountable, does that mean it is infinite? my professor said that: a set is countable if it can be put into a one...

    Started by c2q‎, 09-26-2010 08:32 PM
    • Replies: 2
    • Views: 3,995
    09-27-2010, 01:05 AM Go to last post
  3. Cumulative distribution help.

    Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

    Started by c2q‎, 10-10-2010 08:10 PM
    • Replies: 11
    • Views: 6,010
    10-11-2010, 06:25 PM Go to last post
  4. Help with an expectation.

    How do i determine: E(Y'Xb|X). I think this is the estimated variance covariance matrix but I'm not sure.

    Started by c2q‎, 11-05-2011 05:03 PM
    • Replies: 3
    • Views: 2,953
    11-06-2011, 03:10 PM Go to last post
  5. 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: 5,029
    11-06-2011, 03:27 PM Go to last post
  6. Help with a proof

    If x1...xk are random variables defined on a set omega, and B1...Bk C R^1, then prove that (x1,....,xk)^-1 (B1x,...,xBk) = x1^-1B1 n x2^-1B2 n ......

    Started by c2q‎, 01-31-2012 05:04 PM
    • Replies: 2
    • Views: 2,322
    02-04-2012, 03:41 PM Go to last post
  7. 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: 7,656
    02-05-2012, 10:32 PM Go to last post
  8. 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: 6,818
    02-05-2012, 04:22 PM Go to last post
  9. Gaussian process proof.

    I want to prove that the brownian bridge is a gaussian process. Before I start I just wanted to make sure of something. In my notes my...

    Started by c2q‎, 02-05-2012 04:29 PM
    • Replies: 0
    • Views: 2,956
    02-05-2012, 04:29 PM Go to last post
  10. Probability Distributions

    Hi all, I've got a question here, and i'm not sure if it's how it's written or what, but I'm not quite getting it. Consider an insurance policy...

    Started by c5load‎, 11-12-2009 12:33 PM
    • Replies: 1
    • Views: 4,586
    11-12-2009, 08:11 PM Go to last post
  11. Exclamation Homework Problem. Please Help!

    I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

    Started by ca91‎, 04-28-2013 12:45 AM
    homework, homework help
    • Replies: 6
    • Views: 2,893
    04-28-2013, 02:30 PM Go to last post
  12. Convolution and conditionning: S=X+Y X=two point distribution Y=Normal

    Hello, can anyone help to find the conditional distribution of X given S if S=X+Y X is a r.v. {0,1} 0 with probability p and 1 with probability...

    Started by cactusenok‎, 08-22-2011 09:39 AM
    • Replies: 1
    • Views: 3,041
    08-22-2011, 10:46 AM Go to last post
  13. Factorials

    How would I solve this problem? If I roll a fair die 4 times. X is the number of times 1 or 2 are observed in 4 rolls. What is the minimum number...

    Started by Caggy9702‎, 10-23-2011 07:06 PM
    math, probability, statistics
    • Replies: 6
    • Views: 2,034
    10-23-2011, 08:33 PM Go to last post
  14. Bivariate Normal + Max Transformation

    Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

    Started by caiohm‎, 02-01-2011 03:10 PM
    • Replies: 3
    • Views: 4,096
    02-02-2011, 05:25 PM Go to last post
  15. Help Please!

    Hi, I have a probability question for my Uni Stats course, and I'm having a bit of trouble figuring out what to do. If someone could help, that...

    Started by Caitlin‎, 01-10-2010 06:32 PM
    • Replies: 0
    • Views: 1,885
    01-10-2010, 06:32 PM Go to last post
  16. confidence interval

    Hi every one I have problem with this question . please help me if you can A research collected 17 observations of breakdown voltage with...

    Started by calamariss‎, 12-30-2012 03:50 AM
    • Replies: 2
    • Views: 1,683
    12-30-2012, 05:40 AM Go to last post
  17. help?

    11.32: To estimate the mean height u(mew) of male students on your campus, you will measure an SRS of students. You know from gov't data that the...

    Started by california7‎, 02-08-2009 07:22 PM
    • Replies: 2
    • Views: 6,522
    02-09-2009, 04:08 PM Go to last post
  18. Quetion Reffering to your keno probabilities

    Hello, I was googling about Keno probabilities and came across a thread in your forum about probability of hitting 5 numbers out of 80 with a draw...

    Started by calinut‎, 08-03-2007 11:06 PM
    • Replies: 0
    • Views: 3,152
    08-03-2007, 11:06 PM Go to last post
  19. 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: 4,414
    08-25-2010, 10:22 AM Go to last post
  20. 3D Random Walk

    Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

    Started by Callmesomething‎, 04-11-2008 07:54 PM
    • Replies: 1
    • Views: 4,631
    04-12-2008, 11:32 PM Go to last post
  21. Probability of 11 points first in a game? ** Simple **

    Hi all, I am a newbie here and has some simple probability, just would like to gauge how far i am... A match can be won with two ways: (1)...

    Started by calvtan‎, 05-16-2014 12:31 PM
    • Replies: 0
    • Views: 1,341
    05-16-2014, 12:31 PM Go to last post
  22. Simple Probability

    Years since I have done stats, just want to check I have done this correct: If amazon use 3 companies to deliver parcels, Royal Mail, City Link,...

    Started by calypso‎, 02-01-2015 12:56 PM
    • Replies: 2
    • Views: 1,307
    02-01-2015, 01:59 PM Go to last post
  23. Question Investing in funds

    Hello, maybe someone can help me here? That would be awesome. I have an exam coming up and need to understand this... Linda invests her money in...

    Started by Camana‎, 10-14-2013 01:33 PM
    • Replies: 0
    • Views: 3,715
    10-14-2013, 01:33 PM Go to last post
  24. Simple but convoluted probability help

    For my assignment, I'm working on producing a predictive model of probability based on "historic performance", for want of a better description. I...

    Started by cambleu‎, 11-27-2012 07:57 AM
    • Replies: 3
    • Views: 1,711
    11-27-2012, 10:10 AM Go to last post
  25. Exclamation P. distribution for Finan. Mkts

    Dear All, 1st of all, thanks for making this forum so interesting. I'm trying to find a prob. distrib. for financial mkts (like the stock...

    Started by camera.brera@gmail.com‎, 12-05-2010 03:48 PM
    • Replies: 4
    • Views: 3,825
    12-06-2010, 04:41 PM Go to last post
  26. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 1,506
    02-21-2017, 02:47 AM Go to last post
  27. Binomial distribution problem.

    I think this is a binomial distribution problem but I just don't know how to solve it. It gets a bit hard when I have to decide which is x, n or p ...

    Started by camilaberas‎, 03-31-2014 11:35 AM
    • Replies: 1
    • Views: 2,759
    03-31-2014, 11:54 AM Go to last post
  28. Continuous probabibility distribution.

    Please help me with this problem, I don't understand it pretty well. The management of bidding of a company understands that the low bid X in...

    Started by camilaberas‎, 04-15-2014 01:25 AM
    • Replies: 0
    • Views: 938
    04-15-2014, 01:25 AM Go to last post
  29. product of N normal distributions

    We are given N normal functions, with means \mu_i, and variances \sigma_i^2, i in 1...N. I need to find a formula for the product of the N...

    Started by Camilo‎, 08-25-2011 12:26 AM
    gaussian, gaussian distribution, normal curve
    • Replies: 2
    • Views: 5,010
    08-26-2011, 05:06 PM Go to last post
  30. Pr (10 and a heart) - Am I overthinking this?

    Hi guys, This may be way simplistic for this forum, so I apologise in advance. Drawing two cards from a standard 52 card deck. What is the...

    Started by camm91‎, 11-26-2013 06:43 AM
    • Replies: 3
    • Views: 1,801
    11-26-2013, 09:43 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: 2,368
    04-27-2013, 07:06 PM Go to last post
  32. Roulette Question

    I am really stuggling with this....please help The game of American Roulette is played on a whele which consists of 38 slots, each with its...

    Started by cannoli‎, 01-16-2007 12:00 PM
    • Replies: 4
    • Views: 3,167
    01-17-2007, 12:39 PM Go to last post
  33. Normal Curve

    Calculate the standard score of the given X value, X=61.6 where mu=66.7 and standard deviation is 65.2 I got a negative score of .078, that can't...

    Started by cannoli‎, 01-18-2007 12:15 PM
    • Replies: 1
    • Views: 4,254
    01-19-2007, 10:08 PM Go to last post
  34. Cool normal distribution help

    Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

    Started by canon14‎, 08-24-2009 07:15 PM
    • Replies: 6
    • Views: 2,118
    08-25-2009, 06:42 AM Go to last post
  35. Cool Need Solution Verified!

    Question: The income of junior executives in a large corporation are normally distributed with a standard deviation of $2000. A cutback is pending,...

    Started by canon14‎, 08-25-2009 06:38 AM
    • Replies: 4
    • Views: 2,804
    08-25-2009, 01:38 PM Go to last post
  36. Stuck again. Please advice.

    Question: A coffee company distributes boxes of coffee with a mixture of dark, light and roast. Suppose that the weight of each box is 1 kilogram,...

    Started by canon14‎, 08-25-2009 09:36 PM
    • Replies: 5
    • Views: 2,023
    08-27-2009, 06:59 AM Go to last post
  37. Need some guidance!!!

    I just need my work verified for the problem below. Any help/guidance is much appreciated. A faculty member can be either an assistant professor,...

    Started by canon14‎, 03-16-2010 12:08 PM
    • Replies: 0
    • Views: 3,632
    03-16-2010, 12:08 PM Go to last post
  38. Parametric Test on Ordinal Data

    Hi to everybody, can I used a parametric test to compare, for example, two independent samples when these samples contain ordinal data and are...

    Started by Canyon75‎, 11-12-2008 11:17 AM
    • Replies: 0
    • Views: 3,224
    11-12-2008, 11:17 AM Go to last post
  39. Unhappy problem with all laws...

    I have to pass a test on-line, but I really don't get it. I need to pass it at least 3 times without mistakes (knowing it does change every time i...

    Started by caora‎, 11-21-2005 02:07 PM
    • Replies: 3
    • Views: 4,763
    11-22-2005, 03:47 PM Go to last post
  40. Noob question about "combined" probabilities.

    Hello! Sorry for my poor english, Im from Argentina. And sorry too if Im in the wrong place. I need some knowledged about stats and this forum...

    Started by Capanegra‎, 07-27-2015 08:26 AM
    compare proportions
    • Replies: 10
    • Views: 1,756
    08-04-2015, 09:16 AM Go to last post
  41. 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: 2,876
    11-01-2011, 01:36 PM Go to last post
  42. CDF question

    It is proposed to model the annual salaries X (in $) paid to people in a particular occupation using the continuous cumulative distribution function:...

    Started by capo_mo‎, 11-03-2006 03:18 AM
    • Replies: 2
    • Views: 2,107
    11-06-2006, 05:49 PM Go to last post
  43. first timer

    hi guys, this is my first post here...i decided to come here cos i really am stuck with a bunch of question in an assignment for probabilities that i...

    Started by cappa‎, 04-19-2006 12:10 AM
    • Replies: 1
    • Views: 3,004
    04-19-2006, 09:50 AM Go to last post
  44. 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: 2,175
    11-22-2012, 05:09 PM Go to last post
  45. Basic Probability Question

    I have a question regarding basic proability. In the problem outlined below I am worried that I have calculated incorrectly. More specifically, I...

    Started by caransom‎, 10-21-2006 05:42 PM
    • Replies: 2
    • Views: 4,718
    10-22-2006, 02:53 PM Go to last post
  46. Time Independent Poisson Regression

    Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

    Started by CardiffCasual‎, 11-02-2012 12:02 PM
    • Replies: 5
    • Views: 4,658
    11-03-2012, 02:30 PM Go to last post
  47. Exclamation I need help please!!!

    A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving...

    Started by carebear70417‎, 10-09-2005 08:33 PM
    • Replies: 4
    • Views: 9,999
    10-09-2005, 08:51 PM Go to last post
  48. Births

    Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of an other...

    Started by carebear70417‎, 10-09-2005 09:08 PM
    • Replies: 1
    • Views: 15,885
    10-09-2005, 09:22 PM Go to last post
  49. Unhappy Poison or not Poison, that is the question.... (Shakespeare?)

    Hello, We are investigating vehicle delivery data - which we know if it was pretty random, the arrival intervals of the vehicles will follow a...

    Started by CarelBez‎, 01-26-2012 05:38 AM
    • Replies: 1
    • Views: 2,510
    01-26-2012, 10:41 AM Go to last post
  50. A problem using Bayes Inference

    This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

    Started by carfield‎, 11-13-2011 07:30 PM
    • Replies: 1
    • Views: 2,515
    11-14-2011, 12:27 AM Go to last post
  51. Statistics noob here, in need of help!

    I am doing my first stats assignment of the term and there is a question on which I need help. 1. 72% of students have text books. Among the...

    Started by caribou‎, 06-11-2008 10:27 AM
    • Replies: 2
    • Views: 2,319
    06-11-2008, 11:37 AM Go to last post
  52. Real life example for pairwise independent mutually dependent RVs

    Three or more pairwise independent variables may be mutually dependent. There are several mathematical examples like Bernsteins Paradox. I am...

    Started by carlfriedrich‎, 06-13-2013 02:19 PM
    • Replies: 0
    • Views: 2,416
    06-13-2013, 02:19 PM Go to last post
  53. Direction please

    What statisics to I need to use work out the probability of seeing a dolphin given that it has been seen before? i.e. If it was seen once, will it...

    Started by Carolinew77‎, 03-27-2010 10:12 PM
    • Replies: 1
    • Views: 2,509
    03-28-2010, 06:25 PM Go to last post
  54. a defective probability problem

    I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

    Started by carsont89‎, 10-27-2008 03:34 PM
    • Replies: 5
    • Views: 3,109
    10-28-2008, 08:47 AM Go to last post
  55. I have a real world problem and need some guidance in solving it.

    Hi, I was hoping someone more knowledgeable than myself might be able to help me out with this. I'd be happy just to be pointed in the right...

    Started by caseym‎, 10-28-2011 03:08 PM
    • Replies: 0
    • Views: 1,759
    10-28-2011, 03:08 PM Go to last post
  56. Redundancy probability in employment

    The idea of being made redundant after working so many years in a company is everyone's nightmare. I am currently working in a company employing...

    Started by casy‎, 04-17-2015 03:17 PM
    probability help
    • Replies: 2
    • Views: 1,476
    04-18-2015, 01:40 AM Go to last post
  57. SOA Exam-P Practice

    Anybody studying for the Society of Actuaries Exam-P? I am studying from the practice questions provided on the website. Any good study materials...

    Started by catamount‎, 12-16-2010 08:31 PM
    • Replies: 2
    • Views: 4,204
    12-17-2010, 04:58 PM Go to last post
  58. Uniform Dist.

    Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

    Started by catch22‎, 05-22-2006 06:51 PM
    • Replies: 2
    • Views: 2,621
    05-23-2006, 04:12 AM Go to last post
  59. Post multiple dice rolls where each dice has a different number of sides.

    Hi all, :) I would appreciate any and all help given. Abstract of the problem: How can I calculate the probability of any given number turning up...

    Started by cathalpaint‎, 07-04-2013 08:07 AM
    clueless, dice, probability, sides
    • Replies: 1
    • Views: 3,415
    07-05-2013, 12:14 AM Go to last post
  60. Help

    When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount or buy a large amount. In this situation, if...

    Started by cathy‎, 07-27-2007 10:09 AM
    • Replies: 1
    • Views: 3,381
    07-29-2007, 07:20 PM Go to last post

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