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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. What is the meaning of kurtosis?

    I found in Wikipedia that kurtosis is measurement of peakiness of the famous bell curve. If kurtosis is more than 3, it is kind of peaky, if kurtosis...

    Started by insight‎, 12-04-2007 05:30 AM
    • Replies: 10
    • Views: 25,292
    11-09-2011, 12:39 PM Go to last post
  2. Christmas Present Problem

    May be this is a simple problem for the professionals but its driving me mad. Here is the problem: At Christmas time a group of people at work,...

    Started by elko‎, 01-12-2008 09:03 AM
    • Replies: 10
    • Views: 3,122
    01-17-2008, 02:01 PM Go to last post
  3. Success by chance?

    I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

    Started by meglovestulips‎, 02-21-2008 10:48 AM
    • Replies: 10
    • Views: 3,763
    02-27-2008, 11:27 AM Go to last post
  4. 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: 4,381
    04-09-2008, 08:23 AM Go to last post
  5. Type II error

    I'm currently doing a statistics assigment. In one of the questions, i've been asked to "discuss" what the probability of a Type II error, what i...

    Started by resonance‎, 10-09-2008 07:00 PM
    • Replies: 10
    • Views: 7,418
    10-12-2008, 10:47 AM Go to last post
  6. Question Please Help Me Out (I'm Desperate)

    I can't figure these 2 problems out. I'm not very good at stats, so they might be easy. Please answer, even if you only know one of them or part of...

    Started by DrPepper1‎, 10-27-2008 10:24 PM
    • Replies: 10
    • Views: 6,513
    10-28-2008, 03:06 AM Go to last post
  7. Hopelessly stuck! Please help!

    An electronic switching device occasionally malfunctions and may need to be replaced. It is known that the device is satisfactory if it makes, on...

    Started by ankitj‎, 08-11-2009 06:23 PM
    • Replies: 10
    • Views: 3,985
    08-12-2009, 10:03 AM Go to last post
  8. Law of Total Expectation

    The law of total expectation states that: E(X) = E and E = Eg(X)|Y)] 1) Now, is it correct to say that E(XY)=EXY|Y)] ? I don't think the above...

    Started by kingwinner‎, 11-16-2009 02:09 AM
    • Replies: 10
    • Views: 12,839
    11-18-2009, 02:28 AM Go to last post
  9. find the expected value of continuous random vaiable

    Hi, To find the expected value of a continous random variable I normally integrate the pdf multiplied by the random variable over the range of the...

    Started by PeterVincent‎, 11-17-2009 04:13 PM
    • Replies: 10
    • Views: 14,202
    11-20-2009, 07:05 AM Go to last post
  10. How do you multiply a probability times a probability?

    Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

    Started by cpaavola‎, 01-19-2010 09:38 PM
    • Replies: 10
    • Views: 5,368
    01-20-2010, 01:05 PM Go to last post
  11. PhD student after an equation

    Hi all, I am looking at a statistics problem at the moment and I can't figure out the analytical expression for a curve that I get with my...

    Started by tremebundo‎, 02-22-2010 07:56 PM
    • Replies: 10
    • Views: 3,703
    03-01-2010, 11:06 PM Go to last post
  12. Sampling Probability

    Hi, Can anyone help with this problem: If i have a given volume (v) that contains a number of discrete particles (p) randomly distributed...

    Started by PresterJohn‎, 06-22-2010 07:18 AM
    • Replies: 10
    • Views: 7,735
    06-29-2010, 07:29 AM Go to last post
  13. Gambler's fallacy

    Hi everybody. I have a question about the gambler's fallacy application. I have this board game called "Talisman", where each player has an attribute...

    Started by joseph0000‎, 07-11-2010 11:45 AM
    • Replies: 10
    • Views: 3,880
    07-11-2010, 11:44 PM Go to last post
  14. True or false?

    Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

    Started by Cookie‎, 08-23-2010 09:08 PM
    • Replies: 10
    • Views: 5,343
    08-24-2010, 11:26 PM Go to last post
  15. Combining two different normal distributions.

    I have done the following question: In a hospital, 1/3 of the people who use a particular elevator are adults and 2/3 are children. The weight of...

    Started by univariate‎, 11-21-2010 09:55 PM
    • Replies: 10
    • Views: 15,912
    11-23-2010, 10:41 PM Go to last post
  16. Uniform distribution on a triangle

    Hi All! So happy to find this site! If (x,y) is the value of the random vector (X,Y) and is uniformly distributed over the triangle with vertices...

    Started by ladyluck‎, 12-01-2010 07:50 PM
    • Replies: 10
    • Views: 12,131
    12-03-2010, 03:38 PM Go to last post
  17. Random probability distribution for demand

    Hi All, I have a sample of 100 items with a specific daily expected demand probability. Average demand for a day is 4 (without repetition). I have...

    Started by sach_83‎, 12-28-2010 07:43 AM
    • Replies: 10
    • Views: 10,313
    12-29-2010, 12:22 PM Go to last post
  18. 19 lowercase letters + 1 single digit number = possible combinations ?

    Hi everybody and happy new year too all :tup: I've just discovered this forum today and I have one thing to say : AWESOME ! :) I have trouble...

    Started by frederic1‎, 01-17-2011 01:23 PM
    • Replies: 10
    • Views: 7,400
    01-20-2011, 03:42 AM Go to last post
  19. Joint density function question

    let X and Y be a continuous random variables having joint density function of f(x,y)=c(x^2 + y^2), 0<=x<=1, 0<=y<=1 1) Determine the constant c.

    Started by ARCHCOS‎, 03-09-2011 02:34 PM
    • Replies: 10
    • Views: 4,021
    03-09-2011, 04:52 PM Go to last post
  20. Normal approximation

    Given n=200 and p = 0.01 (probability that you will find a customer spending less that $100). Find the probability that you won't find any that spend...

    Started by raamaak‎, 03-20-2011 07:26 AM
    • Replies: 10
    • Views: 5,763
    03-20-2011, 04:05 PM Go to last post
  21. another question....

    In order for a device to work properly, part A should work, AND, at least one of parts B,D and F (see diagram). All parts are independent, and the...

    Started by Yankel‎, 06-23-2011 09:58 AM
    • Replies: 10
    • Views: 2,729
    06-24-2011, 08:01 AM Go to last post
  22. birthday coincidence

    Hi, I'm wondering if anyone can help with something that's been puzzling my family for years. I have 3 sons, 2 from my first marriage and one from...

    Started by AngieT‎, 08-15-2011 10:34 AM
    • Replies: 10
    • Views: 2,751
    08-17-2011, 02:24 PM Go to last post
  23. Joint Probability

    Hi everyone, For any generic continuous joint CDF, what is the probability of Pr(X=z,Y=z) where X and Y are two random variables on the support of...

    Started by sangiobbe‎, 09-03-2011 11:18 AM
    • Replies: 10
    • Views: 3,219
    09-05-2011, 12:36 PM Go to last post
  24. Coin toss question

    How about a hint about how to approach the following problem. If you toss a fair coin X number of times, what would be the probability that the...

    Started by Mike H.‎, 09-21-2011 07:35 AM
    • Replies: 10
    • Views: 3,460
    09-28-2011, 03:45 PM Go to last post
  25. Find E(X) and VAR (X)

    Question is: There is one error in one of five blocks of program. To find the error, we test three randomly selected blocks. Let X be the number of...

    Started by smske‎, 01-15-2012 08:21 AM
    • Replies: 10
    • Views: 26,771
    04-10-2016, 03:54 AM Go to last post
  26. Probability Involving a Variation on Poker

    Hey everyone, I've been experimenting with probability lately, and I've been creating various games for fun and analyzing the math behind them. On...

    Started by SDRS‎, 08-21-2012 05:57 PM
    combinations, poker, probability
    • Replies: 10
    • Views: 1,960
    08-24-2012, 12:49 AM Go to last post
  27. probablility of a sampling giving a results

    Let's say I know the mean value of a population I do I calculcate the the probablity to find a different value for the mean after x amount of...

    Started by han_solo82‎, 09-20-2012 03:05 PM
    • Replies: 10
    • Views: 2,186
    09-26-2012, 11:09 AM Go to last post
  28. Question Probability involving college admissions

    Here is the question: College admissions: For high school students graduating in 2010, college admissions to the nation’s most selective schools...

    Started by somethingclever‎, 10-20-2012 07:37 PM
    • Replies: 10
    • Views: 4,228
    10-21-2012, 11:55 AM Go to last post
  29. My professor and I disagree on a test's answer. would love to get a second opinion.

    The question is as follows: " In a certain country: 10% of the families have no children 20% of the families have 1 child 30% of the families...

    Started by arielk‎, 02-17-2013 08:07 AM
    random sample, random variable, tests
    • Replies: 10
    • Views: 1,897
    02-25-2013, 01:01 PM Go to last post
  30. Probability of occurance-I don't understand my instructor's solution

    Hello: I am in a statistical process control class and we are studying control charts. My instructor gave the following problem: For the...

    Started by sspillane‎, 05-21-2013 11:09 AM
    • Replies: 10
    • Views: 1,765
    05-23-2013, 03:40 PM Go to last post
  31. Dice probability problem

    2 defending dice do battle with a attacking dice, where a can be any positive integer. The highest scoring defender die is paired with the highest...

    Started by GameGod‎, 05-25-2013 08:46 AM
    • Replies: 10
    • Views: 2,742
    05-28-2013, 06:41 PM Go to last post
  32. Probability on a normal curve

    Hey all - It's been a long time since I was in school looking at probability and statistics. i have a bit of a difficult question for me. I have...

    Started by AJ Laura‎, 06-07-2013 08:42 AM
    curve, normal, probability, statistics
    • Replies: 10
    • Views: 1,643
    06-07-2013, 01:47 PM Go to last post
  33. are mixture of Gaussian distributions still elliptical distributions?

    basically what the title of the thread says, lol. most of my google searches point towards a 'yes' (which is good) but i just wanted to run it...

    Started by spunky‎, 07-01-2013 03:39 AM
    • Replies: 10
    • Views: 2,325
    07-01-2013, 03:07 PM Go to last post
  34. Another Die question

    If one was to roll a fair day and if the outcome is 2 then select a number at random in and other wise select a number at random in . if the number...

    Started by ITman95‎, 11-21-2013 04:39 PM
    • Replies: 10
    • Views: 2,073
    11-27-2013, 08:37 AM Go to last post
  35. Homework exercise

    I have a homework which can not be fully resolved with my knowlage: Firm has 10 employees, 2 womens and 8 mens. The Management Board will randomly...

    Started by epicVoid‎, 05-23-2014 09:38 AM
    • Replies: 10
    • Views: 3,754
    05-23-2014, 01:14 PM Go to last post
  36. Distribution

    Hello, I having doubts on this issue 1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that γ <= B. Which...

    Started by askazy‎, 11-21-2014 09:11 AM
    • Replies: 10
    • Views: 2,173
    11-22-2014, 04:56 PM Go to last post
  37. Noob question about "combined" probabilities.

    Hello! Sorry for my poor english, I´m from Argentina. And sorry too if I´m 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: 1,758
    08-04-2015, 09:16 AM Go to last post
  38. Question Probability for Dice Game

    Hi, i´m programming a little dice game (Android&Windows). As you can see on the screenshot i have 9 dice (right). The objective of the game is to...

    Started by Sakati‎, 03-03-2016 09:40 AM
    • Replies: 10
    • Views: 3,156
    03-07-2016, 09:27 AM Go to last post
  39. Fixing the low value and high value in a probabilistic simulation

    Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

    Started by depakroshanblu‎, 02-20-2017 08:58 AM
    • Replies: 10
    • Views: 2,667
    02-23-2017, 03:33 PM Go to last post
  40. Help!! Probability ?????????????

    I have a problem and need some step to step computation and a bit of explanantion. Have deadine of tomorrow Here's the problem: Oil company...

    Started by Elizer‎, 10-19-2005 08:52 AM
    • Replies: 9
    • Views: 8,931
    10-20-2005, 10:24 AM Go to last post
  41. please help a stupid engineer

    Hi guys, I have a problem which should be pretty basic, but I cannot remember how to do it. There is a probability p that one water customer...

    Started by beezaur‎, 02-17-2006 10:20 PM
    • Replies: 9
    • Views: 3,258
    02-18-2006, 02:30 PM Go to last post
  42. baby probability help

    Hi, with this problem "Tom flips 3 fair coins and Joan flips 2 and Tom wins if he gets more heads than her. What is probability that Tom wins?" At...

    Started by probber‎, 05-08-2006 02:49 PM
    • Replies: 9
    • Views: 3,060
    05-10-2006, 08:22 AM Go to last post
  43. Probability dish washer!!

    Hi I' m really stuck, please help if u can. New dish washer, probabilities the machine needs repairs: 2 types of repair: new pc, new circuits....

    Started by piklas‎, 11-29-2006 02:30 PM
    • Replies: 9
    • Views: 2,638
    12-02-2006, 04:16 PM Go to last post
  44. Angry Probability Problem - urgent

    A quality-control manager claims that a new process for manufacturing cameras is better because the rate of defects is lower than 5&#37;, which had been...

    Started by footsie81‎, 05-26-2007 01:32 PM
    • Replies: 9
    • Views: 3,747
    05-29-2007, 05:47 AM Go to last post
  45. Probablity of the ceiling falling?

    My friend asked me a question. "What is the probability of this ceiling falling?" I was puzzled. Then he replied that the probability is 1/2. Here is...

    Started by Jigar Gosar‎, 09-20-2007 03:10 PM
    • Replies: 9
    • Views: 4,144
    09-22-2007, 08:56 AM Go to last post
  46. Exclamation Prob of happening by chance

    Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

    Started by Adam‎, 04-08-2008 07:02 PM
    • Replies: 9
    • Views: 4,491
    04-22-2008, 09:16 PM Go to last post
  47. Bunch of questions (just need help not answers)

    Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

    Started by pensfan10‎, 10-16-2008 02:07 PM
    • Replies: 9
    • Views: 4,948
    10-23-2008, 10:01 AM Go to last post
  48. Probability of exactly one?

    Hello, I have a question that I am stuck on. Given: the probability of passing a Photography class is 75% and the probability of passing a...

    Started by vit_mar‎, 11-19-2008 06:40 PM
    • Replies: 9
    • Views: 8,246
    11-21-2008, 07:29 AM Go to last post
  49. Chi-Square Test

    Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

    Started by jpkoch74‎, 06-08-2009 05:48 AM
    • Replies: 9
    • Views: 5,044
    06-09-2009, 07:23 AM Go to last post
  50. differences between one-tailed and two-tailed P-value

    I am doing hypothesis testing using t-test and p-value. I calculate my p-value based on the degrees of freedom and the t-test value. The p-value is a...

    Started by lgarcia‎, 04-11-2010 01:33 PM
    • Replies: 9
    • Views: 12,122
    04-12-2010, 09:51 PM Go to last post
  51. Probability inequalities

    I wanna solve following questions: 1-Let X be a discret random variable ,whose possible values are 1,2,....,If P(X=k)is nonincreasing in...

    Started by Emy‎, 06-04-2010 11:21 AM
    • Replies: 9
    • Views: 6,338
    06-15-2010, 04:22 PM Go to last post
  52. Question Minimization of joint pdf

    I want to find out that, for which combination of probability distributions of random variables X and Y, we have minimum joint entropy H(X,Y), ...

    Started by smohantycs‎, 08-21-2010 06:05 PM
    • Replies: 9
    • Views: 3,041
    08-22-2010, 09:05 PM Go to last post
  53. Probability Question

    A question in a tutorial I had was: A bank manager is presented with the details of ten accounts of which two are overdrawn. If he selects three...

    Started by ap183‎, 08-04-2010 12:32 PM
    • Replies: 9
    • Views: 3,037
    08-05-2010, 05:29 PM Go to last post
  54. [Homework help] Binomial distribution questions

    After the BP oil crisis in the Gulf, sixty percent of Americans are in favor of the government’s moratorium on deepwater oil drilling. Out of the...

    Started by Tote6000‎, 09-02-2010 09:07 PM
    • Replies: 9
    • Views: 4,187
    09-03-2010, 04:47 PM Go to last post
  55. calculating stddev from ci - gamma dist

    Hi all, I'm trying to figure out the standard deviation of a gamma distribution armed only with the mean and 90% confidence interval (1.86 for...

    Started by jefflovejapan‎, 09-05-2010 09:14 PM
    • Replies: 9
    • Views: 4,228
    09-07-2010, 04:18 AM Go to last post
  56. Need help asap! Please help

    There are three teams in a cross-country race. Team A has five runners, team B has six runners, and team C has seven runners. In how many ways can...

    Started by lilcutee14life‎, 09-09-2010 11:54 PM
    • Replies: 9
    • Views: 8,080
    09-16-2010, 07:06 PM Go to last post
  57. Counting rules.

    Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

    Started by c2q‎, 09-24-2010 03:50 PM
    • Replies: 9
    • Views: 6,824
    09-26-2010, 08:20 PM Go to last post
  58. Probability of 20-question test, binomial?

    20 true-false quiz to determine who has read a book. Shes wants to choose the passing grade such that the probability of passing a student who...

    Started by gator78‎, 10-12-2010 08:44 PM
    • Replies: 9
    • Views: 9,528
    10-14-2010, 12:28 AM Go to last post
  59. 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: 4,309
    10-14-2010, 03:10 PM Go to last post
  60. Sequence of chess games

    Person A and Person B play a sequence of chess games. S=(A wins a game) and the outcomes of the successive games are independent with P(S)=P(F)=0.5...

    Started by gator78‎, 10-19-2010 08:28 PM
    • Replies: 9
    • Views: 5,776
    10-24-2010, 07:25 PM Go to last post

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